摘要
利用Gleeble-3800热应力/应变模拟实验机对50Mn2V的CCT曲线进行了测定,并对其高温塑性行为进行了研究;分别采用光学显微镜和扫描电镜对组织及断口形貌进行了观察。结果表明:当冷速为0.5～1℃/s时,50Mn2V组织为准多边形铁素体和珠光体(较细珠光体);当冷速为3℃/s时,组织为少量铁素体+少量粒状贝氏体+板条贝氏体;当冷速为5～10℃/s时,组织为少量贝氏体+马氏体;当冷速在10～50℃/s时,组织为马氏体+残余奥氏体。在50Mn2V连铸坯实际生产中,连铸拉矫温度控制在900℃以上可有效降低铸坯裂纹的发生。
The CCT curve of 50 Mn2V was measured by Gleeble-3800 thermal stress/strain simulation machine,and the high temperature plastic behavior of 50 Mn2V was studied.The microstructure and fracture morphology were observed by optical microscopy and scanning electron microscopy,respectively.The results show that when the cooling rate is 0.5-1℃/s,the 50 Mn2V structure is quasi-polygonal ferrite and pearlite(finer pearlite);when the cooling rate is 3℃/s,the microstructure is a small amount of ferrite and a small amount of granular bainite and lath bainite;and when the cooling rate is between 5 and10℃/s,the microstructure is a small amount of bainite+martensite.When the cooling rate is between 10 and 50℃/s,the microstructure is martensite and retained austenite.In the practical production of 50 Mn2V continuous casting billet,the crack can be effectively reduced when the temperature of casting straightening is controlled above 900℃.
作者
邹仲平
路峰
于浩
王毅
ZOU Zhongping;LU Feng;YU Hao;WANG Yi(School of Materials Science and Engineering,Shandong Jianzhu University,Ji'nan 250101,China;Technical Center of Laiwu Branch,Shandong Iron and Steel Co.,Ltd.,Laiwu 271105,China;School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 10083,China;Shandong Iron and Steel Group Co.,Ltd.,Company Research Institute,Ji'nan 250101,China)
出处
《热加工工艺》
北大核心
2019年第2期76-80,86,共6页
Hot Working Technology
