Partially Prealloyed Steel Powder Containing Nickel and Molybdenum for Ultrahigh Strength Sintered Materials

Furukimi, Osamu; Maruta, Keiichi; Abe, Tsuyoshi; Takajo, Shigeaki; Habu, Yasuhiro

doi:10.1179/pom.1991.34.3.212

Cited by 8 publications

(4 citation statements)

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“…Some works study Mo contents higher than 0.5%, but sintering conditions are significantly far from typical sintering conditions used in P/M industry (sintering temperatures above 1200 • C or use of repressing resintering cycles) [4,5]. Since the presence in the market of new grades on prealloyed Fe-1.5% Mo, in early 1990s [6], several works were carried out using this powder [7][8][9][10]. New families of prealloyed powders have been developed using Fe-1.5% Mo as raw material [11].…”

Section: Introductionmentioning

confidence: 99%

Influence of microstructure on mechanical properties of molybdenum alloyed P/M steels

Candela

Velasco

Martínez

et al. 2005

Journal of Materials Processing Technology

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Section: Introductionmentioning

confidence: 99%

Influence of microstructure on mechanical properties of molybdenum alloyed P/M steels

Candela

Velasco

Martínez

et al. 2005

Journal of Materials Processing Technology

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“…As far as we know, this topic has not been investigated for PM steels. Only Furukimi et al 5 have reported that the fracture surface of their specimens might have a lower volume fraction of retained austenite linking it to this phenomenon without characterising it in detail. Thus, the main objective of this work is to determine if the proportions of retained austenite and martensite vary when mechanical testing is performed on alloys containing admixed nickel, which would clearly demonstrate that strain induced martensite formation takes place and is in part responsible for the improved mechanical properties of these alloys.…”

Section: Introductionmentioning

confidence: 99%

Strain induced martensite formation in PM nickel steels

Tougas¹,

Blais

Chagnon

et al. 2012

Powder Metallurgy

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Powder 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.

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“…Higher strength and hardness can be achieved by heat treatment. [9][10][11] Sintered iron steel with a composition of Fe-0 . 3%C showed a tensile strength of 275 MPa with a hardness of 30 HRB and an elongation of 15%.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of Fe–Mo–Mn–Si–C sintered steels

Zhang¹,

Frisk²,

Salwén³

et al. 2004

Powder Metallurgy

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Four Fe-Mn-Si master alloy powders with the compositions were made by the cast milling method, and used to produce Fe-Mo-Mn-Si-C sintered steels. The effects of master alloy composition and sintering atmosphere on the mechanical properties and dimensional change of the sintered steels were studied. The steels were sintered either at 1250uC for 30 min in hydrogen-30% nitrogen or at 1120uC for 30 min in hydrogen and nitrogen-10% hydrogen with different dewpoints. After transient liquid phase sintering, the ultimate tensile strength, yield strength and hardness increase and elongation decreases with increasing contents of manganese and carbon. The dewpoint of sintering atmospheres had little effect on the properties, probably as the addition of manganese and silicon was in the form of a master alloy. The highest tensile strength and smallest dimensional change were obtained in a steel with a composition of Fe-0 . 85%Mo-1 . 40%Mn-0 . 8%Si-0 . 7%C.

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Partially Prealloyed Steel Powder Containing Nickel and Molybdenum for Ultrahigh Strength Sintered Materials

Cited by 8 publications

References 0 publications

Influence of microstructure on mechanical properties of molybdenum alloyed P/M steels

Influence of microstructure on mechanical properties of molybdenum alloyed P/M steels

Strain induced martensite formation in PM nickel steels

Mechanical properties of Fe–Mo–Mn–Si–C sintered steels

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