时效温度对含铜沉淀硬化钢显微组织的影响  

Effect of Aging Temperature on Microstructure of a Precipitation-Hardening Steel Containing Cu

作　　者：吕先松 袁晓敏[1] 刘慧[1] 

机构地区：[1]安徽工业大学材料科学与工程学院,安徽马鞍山243002

出　　处：《热处理》2016年第3期38-42,共5页Heat Treatment

摘　　要：对一种含铜沉淀硬化钢进行了900℃×2 h固溶处理和水冷,随后分别于400℃、450℃、500℃、550℃和650℃时效处理。研究了时效温度对该钢显微观组织的影响。研究结果表明,固溶并水冷得到的板条马氏体随着时效温度的升高逐渐分解,并向多边形铁素体转变;当时效温度低于450℃时,钢中析出物的数量随着时效温度的升高而增加,呈球形且与基体保持共格关系;当时效温度超过450℃时,析出物明显粗化,由球形转变为椭球形,且与基体不再保持共格关系。A precipitation-hardening steel containing copper was solution treated by heating at 900℃ for 2 h and cooled in water, and then was aged at 400 ℃, 450℃, 500℃, 550 ℃ and 650 ℃ respectively. The effect of aging temperature on microstructure of the steel was investigated. The results indicate as follows ： （ 1 ） as the aging temperature increases lath martensite obtained by solution treating and water-cooling decomposes and transforms to polygonal ferrite; （2） when aged at temperatures lower than 450℃ as the aging temperature increases the precipitates in the steel increase in amount, are sphere in shape and bear a coherent relationship with the matrix; （ 3 ） when aged at temperatures higher than 450℃ the precipitates will significantly coarsen, transform from sphere into oval in shape, and bear no longer coherent relationship with matrix.

关 键 词：时效温度 沉淀硬化钢 析出物 显微组织 

分 类 号：TG156.92[金属学及工艺—热处理]