MEMBER PRODUCED BY POWDER FORGING, POWDER MIXTURE FOR POWDER FORGING, PROCESS FOR PRODUCING MEMBER BY POWDER FORGING, AND FRACTURE SPLITTING CONNECTING ROD OBTAINED FROM THE SAME

摘要

The invention and should improve the fatigue strength , while ensuring the machinability without increasing the hardness , as well as , that can achieve a self- consistency after rupture member divided powder forging , powder -stage method for producing a mixed powder and a powder forged member quiet , and provides a fracture split -type connecting rod with the powder forged member . A mixed powder as a powder forged member obtained by forging the sintered preform under high temperature is formed by sintering after the preliminary forming, forging being initiated free Cu ratio is 10% or less in the sintered preform at the time of the addition , after forging the weight % composition in C: 0.2 ~ 0.4%, Cu: 3 ~ 5%, Mn:. more than 0.4% (not including 0) , the balance being substantially made of iron and unavoidable impurities , and the ferrite ratio is 40 to 90%