EP4481082A2 - Compositions d'alliage et articles formés à partir de telles compositions - Google Patents

Compositions d'alliage et articles formés à partir de telles compositions Download PDF

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EP4481082A2
EP4481082A2 EP24178377.8A EP24178377A EP4481082A2 EP 4481082 A2 EP4481082 A2 EP 4481082A2 EP 24178377 A EP24178377 A EP 24178377A EP 4481082 A2 EP4481082 A2 EP 4481082A2
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composition
carbon
max
composition includes
compositions
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EP4481082A3 (fr
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Jeffrey Michael Breznak
Junyoung Park
Jason Robert Parolini
Paul Anthony VANKOOTEN
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Ge Vernova Technology GmbH
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General Electric Technology GmbH
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    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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    • C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
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    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite

Definitions

  • the field of the disclosure relates generally to compositions, and more particularly to alloy compositions and articles formed with the alloy compositions.
  • the alloy compositions are broadly applicable in applications requiring alloys with improved oxidation resistance, reduced retained delta ferrite, and/or improved rupture ductility.
  • Iron-based alloys are commonly used in cast and wrought steel products. However, conventional iron-based alloys exhibit excessive oxidation and poor long-term rupture characteristics such as delta ferrite and rupture ductility. Although some iron-based alloys have improved one or two of these characteristics, no iron-based alloys have maximized all of these characteristics. This is especially true in the power generation industry where iron-based materials operate at higher temperatures and pressures in order increase the efficiencies of various components while not comprising structural integrity.
  • a composition in one aspect, includes from about 10 wt% to about 11 wt% chromium, no more than about 0.030 wt% aluminum, from about 0.08 wt% to about 0.20 wt% carbon, from about 0.10 wt% to about 0.60 wt% silicon, from about 0.05 wt% to about 0.40 wt% vanadium, from about 0.01 wt% to about 0.10 wt% titanium, no more than about 5 wt% of manganese, phosphorus, sulfur, molybdenum, tungsten, nickel, niobium, nitrogen, copper, boron, zirconium, arsenic, tin, antimony, lead, hydrogen, and cobalt, and balance iron and residual elements.
  • an article including a composition includes from about 10 wt% to about 11 wt% chromium, no more than about 0.030 wt% aluminum, from about 0.08 wt% to about 0.20 wt% carbon, from about 0.10 wt% to about 0.60 wt% silicon, from about 0.05 wt% to about 0.40 wt% vanadium, from about 0.01 wt% to about 0.10 wt% titanium, no more than about 5 wt% of manganese, phosphorus, sulfur, molybdenum, tungsten, nickel, niobium, nitrogen, copper, boron, zirconium, arsenic, tin, antimony, lead, hydrogen, and cobalt, and balance iron and residual elements.
  • compositions according to the present disclosure could be used for wrought and cast alloys.
  • the compositions include altered elemental content for Cr, Al, Si, C, Al, Ti, and V compared to other alloy compositions.
  • the Cr content is especially distinct.
  • the compositions exhibit improved oxidation resistance, reduced retained delta ferrite, and improved rupture ductility.
  • Compositions according to the present disclosure are broadly applicable in applications requiring alloys possessing improved oxidation resistance, reduced retained delta ferrite, and/or improved rupture ductility.
  • CSEF Creep Strength Enhanced Ferritic
  • Increasing the chromium content also results in a higher Chrome Equivalent (CE) that can result in the possibility of retaining delta ferrite.
  • Delta ferrite is a low creep resistant phase that will result in reduced long term rupture strength.
  • the amount of retained delta-ferrite is generally less than 5% in the final product.
  • Compositions according to the present disclosure optimize the chemistry of a cast 10-11% chromium alloy to achieve improved oxidation performance while reducing the risk of premature rupture failure due to retained delta ferrite and poor rupture ductility.
  • the embodiments described herein overcome at least some of the disadvantages of known iron-based alloys.
  • the exemplary embodiments described herein include a composition.
  • the composition includes from about 10 wt% to about 11 wt% chromium, no more than about 0.030 wt% aluminum, from about 0.08 wt% to about 0.20 wt% carbon, from about 0.10 wt% to about 0.60 wt% silicon, from about 0.05 wt% to about 0.40 wt% vanadium, from about 0.01 wt% to about 0.10 wt% titanium, no more than about 5 wt% of manganese, phosphorus, sulfur, molybdenum, tungsten, nickel, niobium, nitrogen, copper, boron, zirconium, arsenic, tin, antimony, lead, hydrogen, and cobalt, and balance iron and residual elements
  • the composition may include any suitable amount of chromium (Cr) that facilitates the composition described herein.
  • the composition includes Cr.
  • the composition includes from about 10 wt% to about 11 wt% chromium.
  • the composition includes from about 10.25 wt% to about 11 wt% chromium.
  • the composition includes at least about 10.0 wt% Cr, at least about 10.1 wt% Cr, at least about 10.2 wt% Cr, at least about 10.3 wt% Cr, at least about 10.4 wt% Cr, at least about 10.5 wt% Cr, at least about 10.6 wt% Cr, at least about 10.7 wt% Cr, at least about 10.8 wt% Cr, or at least about 10.9 wt% Cr.
  • the composition includes at most about 10.1 wt% Cr, at most about 10.2 wt% Cr, at most about 10.3 wt% Cr, at most about 10.4 wt% Cr, at most about 10.5 wt% Cr, at most about 10.6 wt% Cr, at most about 10.7 wt% Cr, at most about 10.8 wt% Cr, at most about 10.9 wt% Cr, or at most about 11.0 wt% Cr.
  • the composition may include any suitable amount of aluminum (Al) that facilitates the composition described herein. In some embodiments, the composition does not include aluminum. In some embodiments, the composition includes no more than 0.030 wt% aluminum. In some embodiments, the composition includes no more than 0.015 wt% aluminum.
  • the composition includes at least about 0.005 wt% Al, at least about 0.010 wt% Al, at least about 0.015 wt% Al, at least about 0.020 wt% Al, or at least about 0.025 wt% Al. In some embodiments, the composition includes at most about 0.010 wt% Al, at most about 0.015 wt% Al, at most about 0.020 wt% Al, at most about 0.025 wt% Al, or at most about 0.030 wt% Al.
  • the composition may include any suitable amount of carbon (C) that facilitates the composition described herein.
  • C carbon
  • the composition includes from about 0.08 wt% to about 0.20 wt% carbon. In some embodiments, the composition includes from about 0.12 wt% to about 0.18 wt% carbon.
  • the composition includes at least about 0.08 wt% carbon, at least about 0.09 wt% carbon, at least about 0.10 wt% carbon, at least about 0.11 wt% carbon, at least about 0.12 wt% carbon, at least about 0.13 wt% carbon, at least about 0.14 wt% carbon, at least about 0.15 wt% carbon, at least about 0.16 wt% carbon, at least about 0.17 wt% carbon, at least about 0.18 wt% carbon, or at least about 0.19 wt% carbon.
  • the composition includes at most about 0.09 wt% carbon, at most about 0.10 wt% carbon, at most about 0.11 wt% carbon, at most about 0.12 wt% carbon, at most about 0.13 wt% carbon, at most about 0.14 wt% carbon, at most about 0.15 wt% carbon, at most about 0.16 wt% carbon, at most about 0.17 wt% carbon, at most about 0.18 wt% carbon, at most about 0.19 wt% carbon, or at most about 0.20 wt% carbon.
  • the composition may include any suitable amount of silicon (Si) that facilitates the composition described herein.
  • Si silicon
  • the composition includes from about 0.10 wt% to about 0.60 wt% silicon. In some embodiments, the composition includes from about 0.20 wt% to about 0.40 wt% silicon.
  • the composition includes at least about 0.10 wt% Si, at least about 0.15 wt% Si, at least about 0.20 wt% Si, at least about 0.25 wt% Si, at least about 0.30 wt% Si, at least about 0.35 wt% Si, at least about 0.40 wt% Si, at least about 0.45 wt% Si, at least about 0.50 wt% Si, or at least about 0.55 wt% Si.
  • the composition includes at most about 0.15 wt% Si, at most about 0.20 wt% Si, at most about 0.25 wt% Si, at most about 0.30 wt% Si, at most about 0.35 wt% Si, at most about 0.40 wt% Si, at most about 0.45 wt% Si, at most about 0.50 wt% Si, at most about 0.55 wt% Si, or at most about 0.60 wt% Si.
  • the composition may include any suitable amount of vanadium (V) that facilitates the composition described herein.
  • V vanadium
  • the composition includes from about 0.05 wt% to about 0.40 wt% vanadium. In some embodiments, the composition includes from about 0.10 wt% to about 0.30 wt% vanadium.
  • the composition includes at least about 0.05 wt% V, 0.10 wt% V, at least about 0.15 wt% V, at least about 0.20 wt% V, at least about 0.25 wt% V, at least about 0.30 wt% V, or at least about 0.35 wt% V. In some embodiments, the composition includes at most about 0.10 wt% V, at most about 0.15 wt% V, at most about 0.20 wt% V, at most about 0.25 wt% V, at most about 0.30 wt% V, at most about 0.35 wt% V, or at most about 0.40 wt% V.
  • the composition may include any suitable amount of titanium (Ti) that facilitates the composition described herein.
  • Ti titanium
  • the composition includes from about 0.01 wt% to about 0.10 wt% titanium. In some embodiments, the composition includes from about 0.015 wt% to about 0.060 wt% titanium.
  • the composition includes at least about 0.010 wt% Ti, at least about 0.015 wt% Ti, at least about 0.020 wt% Ti, at least about 0.025 wt% Ti, at least about 0.030 wt% Ti, at least about 0.035 wt% Ti, at least about 0.040 wt% Ti, at least about 0.045 wt% Ti, at least about 0.050 wt% Ti, or at least about 0.055 wt% Ti.
  • the composition includes at most about 0.015 wt% Ti, at most about 0.020 wt% Ti, at most about 0.025 wt% Ti, at most about 0.030 wt% Ti, at most about 0.035 wt% Ti, at most about 0.040 wt% Ti, at most about 0.045 wt% Ti, at most about 0.050 wt% Ti, or at most about 0.055 wt% Ti, or at most about 0.060 wt% Ti.
  • the composition may include any suitable amount of manganese (Mn) that facilitates the composition described herein.
  • Mn manganese
  • the composition includes from about 0.10 wt% to about 1.0 wt% manganese. In some embodiments, the composition includes from about 0.50 wt% to about 1.0 wt% manganese.
  • the composition includes at least about 0.10 wt% Mn, at least about 0.15 wt% Mn, at least about 0.20 wt% Mn, at least about 0.25 wt% Mn, at least about 0.30 wt% Mn, at least about 0.35 wt% Mn, at least about 0.40 wt% Mn, at least about 0.45 wt% Mn, at least about 0.50 wt% Mn, at least about 0.55 wt% Mn, at least about 0.60 wt% Mn, at least about 0.65 wt% Mn, at least about 0.70 wt% Mn, at least about 0.75 wt% Mn, at least about 0.80 wt% Mn, at least about 0.85 wt% Mn, at least about 0.90 wt% Mn, or at least about 0.95 wt% Mn.
  • the composition includes at most about 0.15 wt% Mn, at most about 0.20 wt% Mn, at most about 0.25 wt% Mn, at most about 0.30 wt% Mn, at most about 0.35 wt% Mn, at most about 0.40 wt% Mn, at most about 0.45 wt% Mn, at most about 0.50 wt% Mn, at most about 0.55 wt% Mn, at most about 0.60 wt% Mn, at most about 0.65 wt% Mn, at most about 0.70 wt% Mn, at most about 0.75 wt% Mn, at most about 0.80 wt% Mn, at most about 0.85 wt% Mn, at most about 0.90 wt% Mn, at most about 0.95 wt% Mn, or at most about 1.0 wt% Mn.
  • the composition may include any suitable amount of molybdenum (Mo) that facilitates the composition described herein.
  • Mo molybdenum
  • the composition includes from about 0.10 wt% to about 1.0 wt% molybdenum. In some embodiments, the composition includes from about 0.50 wt% to about 1.0 wt% molybdenum.
  • the composition includes at least about 0.40 wt% Mo, at least about 0.45 wt% Mo, at least about 0.50 wt% Mo, at least about 0.55 wt% Mo, at least about 0.60 wt% Mo, at least about 0.65 wt% Mo, at least about 0.70 wt% Mo, at least about 0.75 wt% Mo, at least about 0.80 wt% Mo, at least about 0.85 wt% Mo, at least about 0.90 wt% Mo, at least about 0.95 wt% Mo, at least about 1.0 wt% Mo, at least about 1.05 wt% Mo, at least about 1.1 wt% Mo, or at least about 1.15 wt% Mo.
  • the composition includes at most about 0.45 wt% Mo, at most about 0.50 wt% Mo, at most about 0.55 wt% Mo, at most about 0.60 wt% Mo, at most about 0.65 wt% Mo, at most about 0.70 wt% Mo, at most about 0.75 wt% Mo, at most about 0.80 wt% Mo, at most about 0.85 wt% Mo, at most about 0.90 wt% Mo, at most about 0.95 wt% Mo, at most about 1.0 wt% Mo, at most about 1.05 wt% Mo, at most about 1.1 wt% Mo, at most about 1.15 wt% Mo, or at most about 1.2 wt% Mo.
  • the composition may include any suitable amount of nickel (Ni) that facilitates the composition described herein.
  • Ni nickel
  • the composition includes from about 0.10 wt% to about 1.0 wt% nickel. In some embodiments, the composition includes from about 0.50 wt% to about 1.0 wt% nickel.
  • the composition includes at least about 0.10 wt% Ni, at least about 0.15 wt% Ni, at least about 0.20 wt% Ni, at least about 0.25 wt% Ni, at least about 0.30 wt% Ni, at least about 0.35 wt% Ni, at least about 0.40 wt% Ni, at least about 0.45 wt% Ni, at least about 0.50 wt% Ni, at least about 0.55 wt% Ni, at least about 0.60 wt% Ni, at least about 0.65 wt% Ni, at least about 0.70 wt% Ni, at least about 0.75 wt% Ni, at least about 0.80 wt% Ni, at least about 0.85 wt% Ni, at least about 0.90 wt% Ni, or at least about 0.95 wt% Ni.
  • the composition includes at most about 0.15 wt% Ni, at most about 0.20 wt% Ni, at most about 0.25 wt% Ni, at most about 0.30 wt% Ni, at most about 0.35 wt% Ni, at most about 0.40 wt% Ni, at most about 0.45 wt% Ni, at most about 0.50 wt% Ni, at most about 0.55 wt% Ni, at most about 0.60 wt% Ni, at most about 0.65 wt% Ni, at most about 0.70 wt% Ni, at most about 0.75 wt% Ni, at most about 0.80 wt% Ni, at most about 0.85 wt% Ni, at most about 0.90 wt% Ni, at most about 0.95 wt% Ni, or at most about 1.0 wt% Ni.
  • the composition may include any suitable amount of niobium (Nb) that facilitates the composition described herein.
  • Nb niobium
  • the composition includes from about 0.01 wt% to about 0.12 wt% niobium. In some embodiments, the composition includes from about 0.05 wt% to about 0.10 wt% niobium.
  • the composition includes at least about 0.01 wt% Nb, at least about 0.02 wt% Nb, at least about 0.03 wt% Nb, at least about 0.04 wt% Nb, at least about 0.05 wt% Nb, at least about 0.06 wt% Nb, at least about 0.07 wt% Nb, at least about 0.08 wt% Nb, at least about 0.09 wt% Nb, at least about 0.10 wt% Nb, or at least about 0.11 wt% Nb.
  • the composition includes at most about 0.02 wt% Nb, at most about 0.03 wt% Nb, at most about 0.04 wt% Nb, at most about 0.05 wt% Nb, at most about 0.06 wt% Nb, at most about 0.07 wt% Nb, at most about 0.08 wt% Nb, at most about 0.09 wt% Nb, at most about 0.010 wt% Nb, at most about 0.11 wt% Nb, or at most about 0.12 wt% Nb.
  • the composition may include any suitable amount of nitrogen (N) that facilitates the composition described herein.
  • N nitrogen
  • the composition includes from about 0.01 wt% to about 0.10 wt% nitrogen. In some embodiments, the composition includes from about 0.03 wt% to about 0.07 wt% nitrogen.
  • the composition includes at least about 0.01 wt% N, at least about 0.02 wt% N, at least about 0.03 wt% N, at least about 0.04 wt% N, at least about 0.05 wt% N, at least about 0.06 wt% N, at least about 0.07 wt% N, at least about 0.08 wt% N, or at least about 0.09 wt% N.
  • the composition includes at most about 0.02 wt% N, at most about 0.03 wt% N, at most about 0.04 wt% N, at most about 0.05 wt% N, at most about 0.06 wt% N, at most about 0.07 wt% N, at most about 0.08 wt% N, at most about 0.09 wt% N, or at most about 0.010 wt% N.
  • the composition may include any suitable amount of copper (Cu) that facilitates the composition described herein.
  • Cu copper
  • the composition includes from about 0.05 wt% to about 0.25 wt% copper. In some embodiments, the composition includes from about 0.10 wt% to about 0.20 wt% copper.
  • the composition includes at least about 0.05 wt% Cu, at least about 0.06 wt% Cu, at least about 0.07 wt% Cu, at least about 0.08 wt% Cu, at least about 0.09 wt% Cu, at least about 0.10 wt% Cu, at least about 0.11 wt% Cu, at least about 0.12 wt% Cu, at least about 0.13 wt% Cu, at least about 0.14 wt% Cu, at least about 0.15 wt% Cu, at least about 0.16 wt% Cu, at least about 0.17 wt% Cu, at least about 0.18 wt% Cu, at least about 0.19 wt% Cu, at least about 0.20 wt% Cu, at least about 0.21 wt% Cu, at least about 0.22 wt% Cu, at least about 0.23 wt% Cu, or at least about 0.24 wt% Cu.
  • the composition includes at most about 0.06 wt% Cu, at most about 0.07 wt% Cu, at most about 0.08 wt% Cu, at most about 0.09 wt% Cu, at most about 0.10 wt% Cu, at most about 0.11 wt% Cu, at most about 0.12 wt% Cu, at most about 0.13 wt% Cu, at most about 0.14 wt% Cu, at most about 0.15 wt% Cu, at most about 0.16 wt% Cu, at most about 0.17 wt% Cu, at most about 0.18 wt% Cu, at most about 0.19 wt% Cu, at most about 0.20 wt% Cu, at most about 0.21 wt% Cu, at most about 0.22 wt% Cu, at most about 0.23 wt% Cu, at most about 0.24 wt% Cu, or at most about 0.25 wt% Cu.
  • the composition may include any suitable amount of iron (Fe) that facilitates the composition described herein.
  • Fe iron
  • the composition includes balance iron. In these embodiments, the amount of iron is sufficient to bring the total weight percent of the composition to 100 wt%.
  • the composition includes at least about 84 wt% Fe, at least about 85 wt% Fe, or at least about 86 wt% Fe. In some embodiments, the composition includes at most about 85 wt% Fe, at most about 86 wt% Fe, or at most about 87 wt% Fe.
  • the composition may include tramp elements.
  • tramp elements include elements that may be inherently present in the composition and substantially alter the material properties of the composition. In some embodiments, tramp elements are not necessary in the composition and provide no benefit to the composition.
  • the composition includes balance iron and residual elements.
  • residual elements include elements that may be inherently present in the composition but do not substantially alter the material properties of the composition if appropriately limited.
  • the amount of iron and residual elements is sufficient to bring the total weight percent of the composition to 100 wt%.
  • the composition may include any suitable amount of manganese (Mn), phosphorus (P), sulfur (S), molybdenum (Mo), tungsten (W), nickel (Ni), niobium (Nb), nitrogen (N), copper (Cu), boron (B), zirconium (Zr), arsenic (As), tin (Sn), antimony (Sb), lead (Pb), hydrogen (H), and cobalt (Co) that facilitates the composition described herein.
  • the composition includes no more than about 5 wt% of manganese, phosphorus, sulfur, molybdenum, tungsten, nickel, niobium, nitrogen, copper, boron, zirconium, arsenic, tin, antimony, lead, hydrogen, and cobalt.
  • the composition includes chromium, carbon, silicon, vanadium, titanium, manganese, molybdenum, nickel, niobium, nitrogen, copper, and iron.
  • the composition further includes at least one element selected from the group consisting of aluminum (Al), phosphorus (P), sulfur (S), tungsten (W), boron (B), zirconium (Zr), arsenic (As), tin (Sn), antimony (Sb), lead (Pb), hydrogen (H), cobalt (Co), and combinations thereof.
  • the composition does not include phosphorus (P), sulfur (S), tungsten (W), boron (B), zirconium (Zr), arsenic (As), tin (Sn), antimony (Sb), lead (Pb), hydrogen (H), and/or cobalt (Co).
  • the composition includes no more than 0.5 wt% of phosphorus, sulfur, tungsten, boron, zirconium, arsenic, tin, antimony, lead, hydrogen, and/or cobalt.
  • the composition includes no more than 0.25 wt% of phosphorus, sulfur, tungsten, boron, zirconium, arsenic, tin, antimony, lead, hydrogen, and/or cobalt
  • the composition is an alloy composition. In some embodiments, the composition is a wrought composition and/or a cast composition.
  • the composition may have a freezing range that facilitates the use of the composition described herein.
  • the freezing range is defined as the difference between liquidus and solidus temperatures.
  • the composition has a freezing range less than about 200 °F. In some embodiments, the composition has a freezing range less than about 175 °F.
  • the composition may have a martensite start temperature that facilitates the use of the composition described herein. In some embodiments, the composition has a martensite start temperature in a range of from about 450 °F to about 550 °F.
  • the composition may have a martensite 90% temperature that facilitates the use of the composition described herein. In some embodiments, the composition has a martensite 90% temperature in a range of from about 250 °F to about 350 °F.
  • composition may be included in any suitable article known in the art that facilitates the use of the composition described herein.
  • the article is produced using, but not limited to only using, a wrought process and/or a cast process. In some embodiments, the article is produced using a cast process.
  • the article is a component of a turbine.
  • the turbine is a gas turbine or a steam turbine.
  • the article is a component of a turbine such as, but not limited to only being, a nozzle, a shroud, a splash plate, a combustor component, a diffuser case, an inner diffuser case, a compressor case, an inner compressor case, a splitter, an inner barrel, a turbine shell, compressor blades, compressor vanes, guide vanes, retaining rings, and a combination thereof.
  • a turbine such as, but not limited to only being, a nozzle, a shroud, a splash plate, a combustor component, a diffuser case, an inner diffuser case, a compressor case, an inner compressor case, a splitter, an inner barrel, a turbine shell, compressor blades, compressor vanes, guide vanes, retaining rings, and a combination thereof.
  • the article is a component of a turbine such as, but not limited to only being, an inner casing for an in-case steam turbine high pressure rotor, an inner casing for an in-case steam turbine intermediate pressure rotor, an outer casing for an in-case steam turbine high pressure rotor, an outer casing for an in-case steam turbine intermediate pressure rotor, a packing head, a diaphragm casing, and a combination thereof.
  • a turbine such as, but not limited to only being, an inner casing for an in-case steam turbine high pressure rotor, an inner casing for an in-case steam turbine intermediate pressure rotor, an outer casing for an in-case steam turbine high pressure rotor, an outer casing for an in-case steam turbine intermediate pressure rotor, a packing head, a diaphragm casing, and a combination thereof.
  • the article is a component of a turbo charger component. In some embodiments, the article is a component of an automobile.
  • the article is configured to be used at a max operating temperature of 750 °C.
  • Example 1 Compositions.
  • compositions according to the present disclosure are shown in the below table.
  • CE1 and CE5 are comparative examples in wrought form.
  • CE2, CE3, and CE4 are comparative examples in casting form.
  • IE1 is an inventive example in casting form.
  • maximum means the maximum amount of the element
  • min means the minimum amount of the element
  • N/A means the element is not present.
  • Table 1 Tested compositions.
  • compositions according to the present disclosure were simulated to determine expected physical properties.
  • the simulated matrix phase properties are shown in the below table and Figures 1A-1D .
  • Freezing range can often be used as a relative predictor of castability.
  • a tighter freezing range generally has less shrinkage tendency and may also be less prone to solidification hot tears.
  • CE2 and IE1 exhibit similar simulated freezing range temperatures, and therefore should exhibit similar castability. Table 3. Critical Solidification Temperatures. Temperature (°F) Phase
  • CE1 CE2
  • CE3 IE1 Liquidus 2735 2725 2716 2716 Solidus 2575 2552 2472 2545 Freezing range 160 173 244 171
  • Ms is the martensite start temperature.
  • M50 is the 50% martensite transformed temperature.
  • M90 is the 90% martensite transformed temperature.
  • HRC is the Rockwell C Hardness.
  • IE1 martensite start temperature is about 500 °F and martensite 90% temperature is about 300 °F.
  • IE1 castings should achieve 100% martensite even in very thick sections during quenching/cooling. Bainite/ferrite/pearlite noses are pushed to very long times.
  • Figures 3A-3B The simulated tempering properties are shown in Figures 3A-3B .
  • Figure 3A depicts the predicted yield strengths and Figure 3B depicts the ultimate tensile strengths. It was observed that all four simulated compositions show similar tempering responses. Tempering may be used to balance strength and toughness.
  • compositions according to the present disclosure could be used for wrought and/or cast alloys.
  • the compositions exhibit improved oxidation resistance, reduced retained delta ferrite, and improved rupture ductility.
  • Compositions according to the present disclosure are broadly applicable in applications requiring alloys with improved oxidation resistance, reduced retained delta ferrite, and/or improved rupture ductility.
  • approximating language such as “generally,” “substantially,” and “about,” as used herein indicates that the term so modified may apply to only an approximate degree, as would be recognized by one of ordinary skill in the art, rather than to an absolute or perfect degree. Accordingly, a value modified by a term or terms such as “about,” “approximately,” and “substantially” is not to be limited to the precise value specified. In at least some instances, the approximating language may correspond to the precision of an instrument for measuring the value. Additionally, unless otherwise indicated, the terms “first,” “second,” etc. are used herein merely as labels, and are not intended to impose ordinal, positional, or hierarchical requirements on the items to which these terms refer. Moreover, reference to, for example, a “second” item does not require or preclude the existence of, for example, a "first” or lower-numbered item or a “third” or higher-numbered item.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Powder Metallurgy (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
EP24178377.8A 2023-06-21 2024-05-28 Compositions d'alliage et articles formés à partir de telles compositions Pending EP4481082A3 (fr)

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CN109789504B (zh) * 2016-09-30 2021-05-07 日本制铁株式会社 铁素体系耐热钢焊接结构体的制造方法及铁素体系耐热钢焊接结构体
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