base alloy for hardened sinter steel parts, process to produce a hardened sinter steel part, hardened sinter steel part, and powder mix to produce a hardened steel part

摘要

base alloy for hardened sinter steel parts, process to produce a hardened sinter steel part, hardened sinter steel part, and powder mix to produce a steel part. The present invention relates to a base alloy for producing a steel part and a process for producing a hardened sinter part from the base alloy. the powdered base alloy has an iron composition, about 1 to less than 5 wt%, of c, about 3 to less than 15 wt%, of mn, and about 3 to less than 15% wt. by weight of cr, wherein the base alloy comprises a microstructure composed of a solid solution of the alloying and carbon elements, the microstructure comprising at least 10% by volume of austenite and the remainder as iron compounds. the process comprises: preparing the base alloy, mixing the base alloy with a powder steel to produce a mixture wherein the weight% of the base alloy is 5 to 35% by weight of the mixture, the compacting the mixture into a one-piece shape and sintering the mixture to produce the steel part, and controlling the cooling rate after sintering to produce sinter hardening. Powder base alloy can also be used as a sinter hardening enhancer when mixed with low alloy steel powders.