Sintered powdered ferrous alloy article and process for producing the alloy article

摘要

A sintered powdered ferrous alloy article having high heat and abrasion resistances and a high workability is produced by admixing, (1) 5 to 30% by weight of a finely divided component alloy which consists of the following composition,PP ______________________________________ PP1 to 4% by weight carbon PP10 to 30% by weight chromium P P2 to 15% by weight nickel PP10 to 30% by weight molybdenum PP20 to 40% by weight cobalt PP 1 to 5% by weight niobium PP the balance iron, P P______________________________________ PP PP(2) 0.8 to 2% by weight of finely divided carbon and (3) the balance of a finely divided ferrous base metal, compression molding the admixture under a pressure of 4 to 6 metric tons/cm.sup.2 and sintering the molded admixture in a reducing atmosphere at a temperature of 1050° to 1150° C, the resultant alloy article comprising a matrix component formed from the finely divided carbon and ferrous base metal, numerous particles of the finely divided component alloy dispersed in the matrix and bounding phases formed, around the particles of the finely divided component alloy, from a portion of the matrix and portions of the finely divided component alloy diffused into the portions of the matrix.