Classifications

• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C33/00—Making ferrous alloys
  • C22C33/02—Making ferrous alloys by powder metallurgy
  • C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
  • C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
  • C22C33/0292—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5% with more than 5% preformed carbides, nitrides or borides
• • C—CHEMISTRY; METALLURGY
  • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
  • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
  • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
  • C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
  • C23C4/123—Spraying molten metal
• • C—CHEMISTRY; METALLURGY
  • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
  • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
  • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
  • C23C4/18—After-treatment

Definitions

• the invention relates to a method for producing starting material according to the preamble of claim 1.
• Coarse and excreted compounds deteriorate according to the interdendritic residual solidification Crucial is the hot deformability of the material and the mechanical properties of workpieces made from it, in particular tools and tool parts, so that there are considerable difficulties in hot forming and hardening as well as high risk of breakage during use.
• the object of the invention was to create a starting material of the type mentioned at the outset which is readily thermoformable, has a high proportion of metal compounds with a small grain diameter, can be easily hardened and the workpieces made therefrom have good mechanical properties, especially high toughness.
• the rest of the iron and melting-related impurities were broken down into liquid individual particles with nitrogen after emerging from a melt container and a metal spray stream was formed.
• a powder with a grain size of 14 to 28 ⁇ m and with a composition of in% by weight was introduced into this metal spray stream.
• the rest of the production-related impurities are introduced, applied to the surface in several layers with the liquid individual particles and allowed to solidify.
• the ratio of the weight of liquid individual particles to powder was approximately 1: 0.4.
• the body obtained on the base by relative movement of the powder / metal spray stream had a total thickness of 110 mm and was thermoformed with an 8.5-fold deformation by forging into a starting material for tools.
• a tool made from the primary material for machining castings had a proportion of 31% by volume of niobium carbide after the heat treatment, the maximum carbide grain size being 12 ⁇ m.
• the niobium carbide (NbC) grains with a melting point of approx. 3600 ° C were largely homogeneously distributed in the high-speed steel matrix.
• a hardness of 65 HRC and a flexural strength of 3600 MPa were determined on the tool as material values, the service life in practical use was 3.6 times as high in comparison with a similar tool made of a steel DIN material No. 1.3343.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Physics & Mathematics (AREA)
• Plasma & Fusion (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Powder Metallurgy (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=3537460

Family Applications (1)

Country Status (2)

Cited By (4)

Family Cites Families (10)

• 1989
  • 1989-11-16 AT AT0261789A patent/AT395230B/de not_active IP Right Cessation
• 1990
  • 1990-11-05 EP EP19900890293 patent/EP0433264A3/de not_active Withdrawn

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