C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
C21D 6/02 (2006.01) C21D 6/00 (2006.01) C21D 9/32 (2006.01) C22C 38/44 (2006.01) C22C 38/52 (2006.01)
Patent
CA 2695472
A case hardened gear steel having enhanced core fracture toughness includes by weight percent about 16.3Co, 7.5Ni, 3.5Cr, 1.75Mo, 0.2W, 0.11C, 0.03Ti, and 0.02V and the balance Fe, characterized as a predominantly lath martensitic microstructure essentially free of topologically close-packed (TCP) phases and carburized to include fine M2C carbides to provide a case hardness of at least about 62 HRC and a core toughness of at least about 50 ksiVin.
L'invention concerne un acier à engrenage cémenté présentant une ténacité à la rupture de cur accrue. Cet acier comprend, en pourcentage en poids, environ 16,3 Co, 7,5 Ni, 3,5 Cr, 1,75 Mo, 0,2 W, 0,11 C, 0,03 Ti et 0,02 V, le reste étant du Fe. L'acier est caractérisé par une microstructure martensitique principalement de latte, essentiellement dépourvue de phases topologiquement compactes (TCP) et carburisée pour inclure de fins carbures de M2Cafin de conférer une cémentation d'au moins environ 62 HRC et une ténacité de cur d'au moins environ 50 ksiVin.
Sebastian Jason
Wright James A.
Questek Innovations Llc
Smart & Biggar
LandOfFree
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