冷却速度对热轧钢板应变时效敏感性的影响  

Effect of Cooling Velocity on Strain-aging Sensibility of Hot Rolled Steel Plate

作　　者：李红英[1] 丁常伟[1] 张希旺[1] 王长建[1] 倪磊[1] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《矿冶工程》2007年第4期74-76,共3页Mining and Metallurgical Engineering

摘　　要：研究了2种冷却速度对16MnR热轧钢板应变时效敏感性的影响。试样进行970℃正火(以空冷和风冷两种不同的速度冷却),用夏比(V型缺口)冲击法测定其应变时效敏感性系数,通过金相显微镜(OM)、扫描电镜(SEM)和透射电镜(TEM)对2种状态试样的微观组织进行了观察分析。结果表明,在较快的冷却速度下(风冷),可获得较多的贝氏体和较细的片状珠光体,从而减少了钢中的自由碳、氮原子,并阻碍了它们的扩散,使得16MnR钢在应变后的时效过程中较难形成柯垂尔气团,降低了其应变时效敏感性。The effect of two cooling velocity on strain-aging sensibility of 16MnR hot rolled steel plate has been studied. Test samples were cooled down by two different kinds of cooling velocity, air cooling and wind cooling after 970℃ nor-malizing treatment. The strain-aging sensibility coefficient in two states was determined by Charpy-type test. The micro- structure of the obtained materials was investigated by optical microscope, scanning electronic microscope and transmis- sion electron microscope. Results indicate that under the quicker cooling rate （wind cooling）, more bainite and the thinner laminated perlite can be obtained, which can reduce free carbon and nitrogen atoms in the steel and hinder their diffuseness, and further result in the formation of Cottrell air mass to be more difficult in the course of ageing after the strain and decrease the strain-aging sensitivity of 16MnR steel.

关 键 词：金属热处理 16MNR钢 应变时效敏感性 冷却速度 柯垂尔气团 

分 类 号：TG142.1[一般工业技术—材料科学与工程]