Strain induced martensite formation in PM nickel steels

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Journal titlePowder Metallurgy
Pages348353; # of pages: 6
SubjectConventional sintering; High impact resistance; Iron Particles; Nickel particles; Strain-induced martensite; Stress-induced; Volume diffusion; Volume fraction of retained austenite; Martensite; Mechanical properties; Mechanical testing; Nickel; Optical microscopy; Phase transitions; Sintering; Steel; Powder metallurgy
AbstractPowder metallurgy (PM) nickel steels are often selected because they have high strength, high impact resistance and good abrasion resistance. The microstructure of slowly cooled PM nickel steels typically contains pearlite, bainite, martensite and a fair volume fraction of retained austenite. Since volume diffusion is really low at conventional sintering temperatures [1120- 1150uC (2050-2100uF)], nickel rich areas are usually found where prior admixed nickel particles were located, i.e. at the surface of iron particles and in sintering necks. Therefore, there is a discrepancy between the rather low mechanical properties of austenite and the high strength of PM nickel steel. Hence, the hypotheses that stress induced or strain induced martensite formation takes place during mechanical testing have been investigated. Results show that martensite forms during mechanical testing, and its final volume fraction is proportional to nickel content. © 2013 Institute of Materials, Minerals and Mining.
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AffiliationNational Research Council Canada (NRC-CNRC); NRC Industrial Materials Institute (IMI-IMI)
Peer reviewedYes
NPARC number21269243
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Record identifierf79d3c5e-62c5-4734-85c0-62082ed1b3a0
Record created2013-12-12
Record modified2016-05-09
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