【作者】 陈伟； 李龙飞； 杨王玥； 孙祖庆；

【Author】 Chen Wei~1 Li Longfei~1 Yang Wangyue~2 Sun Zuqing~2 (1.State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing,100083;2.School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing,100083)

【机构】 北京科技大学新金属材料国家重点实验室； 北京科技大学材料科学与工程学院；

【摘要】 利用Gleeble 1500热模拟试验机进行单轴热压缩实验,研究了初始变形组织（过冷奥氏体、珠光体和马氏体）对过共析钢经热机械处理后所得超细化（α+θ）复相组织力学性能的影响。结果表明:三种不同初始变形组织（过冷奥氏体、珠光体和马氏体）的过共析钢在650℃,以0.01 s^-1应变速率应变1.61后均可获得超细化的（α+θ）复相组织,且工艺较为简单。三种不同初始变形组织热机械处理后所得超细化（α+θ）复相组织的综合力学性能优于片层珠光体的力学性能。且初始变形组织为马氏体的超细化（α+θ）复相组织表现出更好的综合力学性能,其屈服强度为681 MPa,抗拉强度为843 MPa,总延伸率约为12%。更多还原

【Abstract】 The effect of initial deformed microstructures on the mechanical properties of ultrafine microduplex structures of hypereutectoid steel was investigated by uniaxial hot compression simulation experiment.The results indicate that the ultrafine （α+θ） microduplex structure of the hypereutectoid steel could be formed by three initial deformed microstructures （undercooled austenite,pearlite and martensite） deformed to 1.61 at 650℃and 0.01 s^-1,the processes were simply.The mechanical properties of the ultrafine microduplex structures deformed by three initial deformed microstructures were better than that of the normal microstructure with lamellar pearlite and proeutectoid cementite.The microduplex structure obtained by martensite warm deformation demonstrated the best mechanical properties,with the yield strength being 681 MPa,and the tensile strength being 843 MPa,the total elongation was 12%.更多还原