Iron powder article having improved toughness

Details Iron powder article having improved toughness Iron powder article having improved toughness

1985-06-14

1986-10-21

Lechert, Jr., Stephen J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Metal and nonmetal in final product

419 12, 419 23, 419 38, 419 47, 419 54, 419 60, 75243, 75244, 75247, B22F 100

Patent

active

046184732

ABSTRACT:
A method for forming an iron alloy article having increased toughness comprises compacting and sintering a powder mixture composed of predominantly iron powder and carbon powder and containing a powder of a liquating nickel boride compound. Limited nickel diffusion into the iron structure during sintering produces metastable retained austenite in regions about pores in the product structure that retards crack formation and thereby improves mechanical properties.

REFERENCES:
patent: 3999952 (1976-12-01), Kondo et al.
patent: 4327156 (1982-04-01), Dillon et al.

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