Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Patent
1993-11-30
1995-06-27
Mai, Ngoclan T.
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
75235, 75236, 75243, 75244, 75246, 419 11, 419 13, 419 14, 419 19, 419 29, 419 31, 419 32, 419 33, 419 38, C22C 912, B22F 100
Patent
active
054276004
ABSTRACT:
A low alloy sintered steel contains at least 0.15 percent by weight and less than 0.8 percent by weight of carbon. Its matrix is formed by a tempered martensite containing prior austenite crystal grains of not more than 15 .mu.m in mean grain size. Pores and nonmetallic inclusions contained in the matrix are not more than 50 .mu.m in maximum diameter, and the density of the low alloy sintered steel is at least 96 percent of theoretical density. A raw material powder for forming the low alloy sintered steel includes iron alloy powder which is prepared by an atomizing process, and is treated with a dry mill in an inert gas atmosphere or in the atmospheric air. Thus, dislocations are introduced into the raw material powder, and nonmetallic inclusions contained in the raw material powder are pulverized to be not more than 50 .mu.m in maximum diameter. Not only static characteristics but also dynamic characteristics, such as fatigue strength, of the low alloy sintered steel are improved.
REFERENCES:
patent: 3816081 (1974-06-01), Hale
patent: 3859086 (1975-01-01), Church et al.
patent: 3887402 (1975-06-01), Kondo et al.
patent: 3900309 (1975-08-01), Chao et al.
patent: 4066449 (1978-01-01), Havel
patent: 4121927 (1978-10-01), Lohman et al.
patent: 4318733 (1982-03-01), Ray et al.
patent: 4519839 (1985-05-01), Toyoaki et al.
patent: 4556424 (1985-12-01), Viswanadham
patent: 4585619 (1986-04-01), Westin
patent: 4647304 (1987-03-01), Petkovic-Luton et al.
patent: 4693864 (1987-09-01), Lloyd
patent: 4705565 (1987-11-01), Beltz et al.
patent: 4799955 (1989-01-01), McClellan
patent: 5126104 (1992-06-01), Anand et al.
patent: 5273570 (1993-12-01), Sato et al.
Ito Kozo
Itoh Yoshiaki
Takeda Yoshinobu
Fasse W. F.
Fasse W. G.
Mai Ngoclan T.
Sumitomo Electric Industries Ltd.
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