轧制加热温度对高强度低合金钢组织及冲击性能的影响  

Influence of rolling heating temperature on microstructure and impact property of a high strength low alloy steel

作　　者：陈刚[1,2] 罗小兵[1] 柴锋[1] 杨才福[1] 张正延[1] 杨丽[1] Chen Gang;Luo Xiaobing;Chai Feng;Yang Caifu;Zhang Zhengyan;Yang Li(Research Instituteof Engineering Steel,Central Iron and Steel Research Institute Co.,Ltd.,Beijing 100081,China;School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]钢铁研究总院有限公司工程用钢研究院,北京100081 [2]清华大学材料科学与工程学院,北京100084

出　　处：《金属热处理》2022年第4期116-121,共6页Heat Treatment of Metals

基　　金：国家重点研发计划(2017YFB0701802)。

摘　　要：研究了轧制加热温度对高强度低合金钢相变组织及-40℃冲击性能的影响。结果表明,不同轧制加热温度条件下,试验钢显微组织由粒状贝氏体组成,M/A岛尺寸随着轧制加热温度的升高而增大。轧制加热温度在1000~1150℃时,冲击性能良好,显微组织中M/A岛细小弥散,大角度晶界密度较大。轧制加热温度高于1150℃时,原始奥氏体晶粒尺寸明显粗化,相变后产生的M/A岛明显粗化,大角度晶界密度降低;随着轧制加热温度的升高,M/A岛的粗化以及大角度晶界密度的降低,共同导致冲击性能的下降。Effect of rolling heating temperature on microstructuree and-40℃impact property of high strength low alloy(HSLA)steel was investigated.The results show that the microstructure of HSLA steel is composed by granular bainite.The size of M/A island increases with the increase of rolling heating temperature.When the rolling heating temperature is 1000-1150℃,the impact property is good,the M/A islands in the microstructure are finely dispersed,and the large-angle grain boundary density is relatively large.The grain size of the prior austenite is obviously coarser above 1150℃,the M/A islands produced after the phase transformation are significantly coarser,and the large-angle grain boundary density is lower.With the increasing of the rolling heating temperature,the M/A islands coarsened and the density of the large-angle interface decreased result in a decrease in impact toughness.

关 键 词：HSLA钢 轧制加热温度 原始奥氏体 晶粒尺寸 M/A岛 冲击性能 

分 类 号：TG156.1[金属学及工艺—热处理]