奥氏体化温度对贝氏体钢等温转变及力学性能的影响  

Effect of austenitizing temperature on isothermal transformation and mechanical properties of bainite steel

作　　者：王云龙 余伟 张昳 史佳新 李明辉 Wang Yunlong;Yu Wei;Zhang Yi;Shi Jiaxin;Li Minghui(Institute of Engineering Technology,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学工程技术研究院,北京100083

出　　处：《金属热处理》2022年第4期80-85,共6页Heat Treatment of Metals

摘　　要：采用热膨胀仪和热模拟试验机在880~1050℃奥氏体化后进行300℃等温转变试验,研究了不同奥氏体化温度对中碳贝氏体钢等温相变动力学以及组织形貌、力学性能的影响。结果表明,奥氏体化温度升高导致晶粒尺寸增加,Ms点下降,贝氏体等温相变的孕育期延长;降低奥氏体化温度,可明显缩短贝氏体转变速率峰值出现的时间,说明较低的奥氏体化温度有利于加速贝氏体的转变。在本试验温度范围内,880℃奥氏体化处理试样的综合力学性能优异,抗拉强度为1671 MPa,伸长率为13.3%。Effect of austenitizing temperature on isothermal phase transformation kinetics,microstructure and mechanical properties of a medium carbon bainitic steel was studied by isothermal transformation test at 300℃after austenitizing at 880-1050℃with thermal dilatometer and thermal simulation testing machine.The results show that the increase of austenitizing temperature leads to the increase of grain size,the decrease of Ms point and the prolonging of the incubation period of bainite isothermal phase transformation.Decreasing the austenitizing temperature can significantly shorten the time of peak bainite transformation rate,indicating that lower austenitizing temperature is conducive to accelerating the bainite transformation.In the temperature range of this experiment,the specimens treated by austenitizing at 880℃have excellent comprehensive mechanical properties,with the tensile strength of 1671 MPa and elongation of 13.3%.

关 键 词：贝氏体钢 奥氏体化温度 相变动力学 组织结构 力学性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程]