摘要
将初始组织为马氏体的0.2C-1.6Si-1.8Mn钢在不同温度(840,870,910℃)奥氏体化后进行淬火-配分(Q&P)处理,研究了奥氏体化温度对该钢显微组织与拉伸性能的影响。结果表明:当奥氏体化温度在两相区时,Q&P处理后试验钢中的铁素体主要呈带状,残余奥氏体呈块状和薄带状;随着奥氏体化温度升高,铁素体和残余奥氏体含量减少,马氏体含量增加,对应的屈服强度和抗拉强度增大,断后伸长率和强塑积下降;840℃奥氏体化+Q&P处理后试验钢更高的断后伸长率与其更高含量的残余奥氏体且残余奥氏体呈块状和薄带状2种形态有关,这能有效扩展相变诱导塑性效应区间。
0.2C-1.6Si-1.8Mn steel with initial martensite microstructures was subjected to austenitizing at different temperatures(840,870,910℃)and quenching-partitioning(Q&P)treatment.The effect of austenitizing temperature on the microstructure and tensile properties of the steel was studied.The results show that when the austenitizing temperature was in the two-phase region,the ferrite in the Q&P treated experimental steel was mainly banded,and the retained austenite was blocky and flaky.With the increase of austenitizing temperature,the content of ferrite and retained austenite decreased,and the content of martensite increased;accordingly,the yield strength and the tensile strength increased while the percentage elongation after fracture and the product of strength and elongation decreased.The higher percentage elongation after fracture of the Q&P treated experimental steel at austenitizing temperature of 840℃was related to the higher content of the retained austenite with two forms of block and flake,which could effectively expand the transformation induced plasticity effect range.
作者
阎骏
周博文
樊雷
YAN Jun;ZHOU Bowen;FAN Lei(Guangxi Liuzhou Iron&Steel Co.,Ltd.,Liuzhou 545000,China)
出处
《机械工程材料》
CAS
CSCD
北大核心
2023年第2期39-43,49,共6页
Materials For Mechanical Engineering
基金
广西科技重大专项项目(桂科AA22067079)。
关键词
淬火-配分钢
奥氏体化温度
残余奥氏体形态
力学性能
quenching&partitioning steel
austenitizing temperature
retained austenite morphology
mechanical property
