EP0178894A2 - Procédé de traitement thermique de fonte à haute teneur en chrome et une pièce d'usure en fonte à haute teneur en chrome - Google Patents

Procédé de traitement thermique de fonte à haute teneur en chrome et une pièce d'usure en fonte à haute teneur en chrome Download PDF

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Publication number
EP0178894A2
EP0178894A2 EP85307389A EP85307389A EP0178894A2 EP 0178894 A2 EP0178894 A2 EP 0178894A2 EP 85307389 A EP85307389 A EP 85307389A EP 85307389 A EP85307389 A EP 85307389A EP 0178894 A2 EP0178894 A2 EP 0178894A2
Authority
EP
European Patent Office
Prior art keywords
component
alloy
chromium
tungsten
content
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP85307389A
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German (de)
English (en)
Other versions
EP0178894A3 (fr
Inventor
Raymond William Durman
David William John Elwell
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bradley & Foster Ltd
Original Assignee
Bradley & Foster Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bradley & Foster Ltd filed Critical Bradley & Foster Ltd
Publication of EP0178894A2 publication Critical patent/EP0178894A2/fr
Publication of EP0178894A3 publication Critical patent/EP0178894A3/fr
Withdrawn legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/06—Cast-iron alloys containing chromium
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/002—Heat treatment of ferrous alloys containing Cr

Definitions

  • the present invention relates to a method of producing tough, wear resistant components from a high chromium cast ferrous-based alloy and to a wearing element which is formed of a high chromium ferrous-based alloy and which is for a breaking, grinding or crushing machine.
  • a wearing element of a breaking, crushing or grinding machine said wearing element being (a) formed of a high chromium, ferrous-based alloy consisting of 11-28 wt% chromium, 1-3.6 wt % carbon and at least 0.2 wt% (preferably 0.2 to about 4 wt%) molybdenum and/or at least 0.6 wt% (preferably 0.6 to about 6 wt%) tungsten, the remainder (apart from any incidental ingredients and impurities) being iron, and (b) having a stable austenitic matrix in which is dispersed a partially spheroidised hard carbide phase.
  • the chromium content of the alloy is 14-20 wt%.
  • the carbon content of the alloy is 1.5 - 3 wt%, more preferably 2-3 wt%.
  • volume fraction of hard carbides is given by the following relationship (Ref. F. Maratray, 1971, A.F.S. Transactions).-
  • the molybdenum content when present is 1 - 4 wt% and the tungsten content, when present, is 2- 5.5 wt%.
  • the heating rate should be sufficiently slow to avoid cracking of the castings.
  • the component is heated to a treatment temperature of 1180°C and maintained at this temperature for up to 72 hours, preferably up to 24 hours, more preferably 4 to 24 hours, most preferably 4 to 10 hours.
  • a treatment temperature of 1180°C is desirable to minimise the heat treatment time.
  • heat treatment for longer than 72 hours produces no significant improvement in properties over an extended heat treatment on an alloy containing no molybdenum or tungsten as catalyst.
  • Quenching of the component must be sufficiently fast to retain an austenitic matrix.
  • the quenching rate in the critical temperature range is the important factor.
  • the limits of the critical temperature range are defined by the treatment temperature employed in step a) above and the upper critical temperature (A3).
  • the quenching rate is the mean cooling rate of the furnace load, for example as measured by a thermocouple inserted into the furnace load.
  • the heat treatment used in the present invention may also be carried out under pressure e.g by hot isostatic pressing, typically at 105 MPa.
  • the quenching rate in the critical temperature range is 37°C/min to 3°C/min.
  • the non-oxidising atmosphere may for example be a protective atmosphere such as nitrogen.
  • an inert gas such as nitrogen.
  • the quenching rate in the critical temperature range is typically affected by the factors such as size of furnace load, type of furnace etc.
  • Castings having a section size of between 40 mm and 100 mm are produced with the following chemical composition (wt %):-
  • the temperature of the furnace load (20 castings arranged as a single layer) is measured using a load thermocouple positioned as near as possible to the centre of the load (i.e the slowest part of the load to heat up and cool down).
  • each casting has a pivot hole therein and the load thermocouple is placed in that pivot hole which is the nearest to the centre of the load.
  • the material exhibits the following typical mechanical properties:
  • a high chromium cast iron having the following chemical composition in wt%:-C Si S P Mn Ni Cr Cu Mo Fe 2.59 0.53 0.042 0.034 0.59 0.18 15.9 0.17 2.22 balance is heated in vacuum from ambient to 750°C at 150°C/hour from 750°C to 1180°C at 250°C/hour, held at 1180°C for 8 hours and then quenched at an average rate of 2.5°C/minute through the critical temperature range.
  • Hardness typically Hv 30 - 690 Fracture Toughness, typically: K ICSB - 45.0 MN/m 3 / 2
  • a high chromium ferrous-alloy containing the following alloying ingredients in wt%:-C Si S P Mn Ni Cr Fe 0.82 0.44 0.044 0.031 0.56 0.18 16.3 balance is heated to 1150°C for 8 hours results in the segregation of carbides into an embrittling grain boundary film. This is due to the low carbon content.
  • This material has a microstructure in which the absence of Mo or W has resulted in the absence of spheroidisation and consequently this material is not satisfactory
  • Examples 3 and 6 are heat treated as stated but for an extended period of over about 72 hours. After this extended treatment, it is found that the beneficial catalystic effect of the molybdenum or tungsten addition is lost.
  • a material within the preferred ranges regarding other components but with a carbon content in excess of 3.6% by weight contains a significant volume fraction of large primary chromium carbides which promote an embrittling effect within the material.
  • chromium content is less than 11 wt%, a low volume fraction of hard chromium carbides is formed. If the chromium content falls to about 8 wt% (or less) then the chemical composition of the carbide phase changes and a less hard carbide is formed.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Heat Treatment Of Articles (AREA)
EP85307389A 1984-10-17 1985-10-15 Procédé de traitement thermique de fonte à haute teneur en chrome et une pièce d'usure en fonte à haute teneur en chrome Withdrawn EP0178894A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8426222 1984-10-17
GB8426222 1984-10-17

Publications (2)

Publication Number Publication Date
EP0178894A2 true EP0178894A2 (fr) 1986-04-23
EP0178894A3 EP0178894A3 (fr) 1987-06-24

Family

ID=10568314

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85307389A Withdrawn EP0178894A3 (fr) 1984-10-17 1985-10-15 Procédé de traitement thermique de fonte à haute teneur en chrome et une pièce d'usure en fonte à haute teneur en chrome

Country Status (2)

Country Link
EP (1) EP0178894A3 (fr)
GB (1) GB2167438B (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3818350A1 (de) * 1987-05-30 1988-12-08 Nippon Piston Ring Co Ltd Kipphebel fuer die verwendung in einer brennkraftmaschine
WO1998017834A1 (fr) * 1996-10-24 1998-04-30 Ksb Aktiengesellschaft Materiau pour parties de machines sollicitees en glissement
WO2005014238A1 (fr) * 2003-08-07 2005-02-17 Stahlwerke Bochum Gmbh Outil composite pour des contraintes de percusion et/ou d'abrasion
CN112338171A (zh) * 2020-11-04 2021-02-09 湖北恩腾机械有限公司 一种金属耐磨合金法兰的制备工艺
US20230313331A1 (en) * 2022-03-29 2023-10-05 Townley Foundry & Machine Co., Inc. Hypereutectic white iron alloy comprising chromium, boron and nitrogen and cryogenically hardened articles made therefrom

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2299922C1 (ru) * 2005-09-12 2007-05-27 Открытое акционерное общество "Баймакский литейно-механический завод" Чугун
CN102146546B (zh) * 2010-02-09 2015-12-02 徐州胜海机械制造科技有限公司 一种用于固体物料输送管的高流动性高耐磨性合金材料

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2773761A (en) * 1954-01-08 1956-12-11 Calumet Steel Castings Corp Ferrous chrome alloy
GB1073971A (en) * 1964-05-21 1967-06-28 Chrysler Corp Iron base alloys
GB1111290A (en) * 1964-10-12 1968-04-24 Abec Corp Alloy cast iron
BE794732A (fr) * 1972-02-21 1973-05-16 Boehler & Co Ag Geb Utilisation d'un alliage ledeburitique fer-chrome pour la fabrication d'outils de travail a froid
FR2228115B1 (fr) * 1973-05-04 1975-11-21 Thome Cromback Acieries
US4080198A (en) * 1977-02-24 1978-03-21 Abex Corporation Erosion and corrosion resistant alloys containing chromium, nickel and molybdenum
CH648353A5 (de) * 1979-11-19 1985-03-15 Fischer Ag Georg Gussteile mit hoher schlagzaehigkeit und ein verfahren zu deren herstellung.

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3818350A1 (de) * 1987-05-30 1988-12-08 Nippon Piston Ring Co Ltd Kipphebel fuer die verwendung in einer brennkraftmaschine
WO1998017834A1 (fr) * 1996-10-24 1998-04-30 Ksb Aktiengesellschaft Materiau pour parties de machines sollicitees en glissement
WO2005014238A1 (fr) * 2003-08-07 2005-02-17 Stahlwerke Bochum Gmbh Outil composite pour des contraintes de percusion et/ou d'abrasion
CN112338171A (zh) * 2020-11-04 2021-02-09 湖北恩腾机械有限公司 一种金属耐磨合金法兰的制备工艺
US20230313331A1 (en) * 2022-03-29 2023-10-05 Townley Foundry & Machine Co., Inc. Hypereutectic white iron alloy comprising chromium, boron and nitrogen and cryogenically hardened articles made therefrom
US12084732B2 (en) * 2022-03-29 2024-09-10 Townley Foundry & Machine Co., Inc. Hypereutectic white iron alloy comprising chromium, boron and nitrogen and cryogenically hardened articles made therefrom

Also Published As

Publication number Publication date
GB2167438B (en) 1988-11-23
EP0178894A3 (fr) 1987-06-24
GB8525382D0 (en) 1985-11-20
GB2167438A (en) 1986-05-29

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