摘要
应用光学显微镜以及力学性能测试设备研究了不同正火温度及保温时间对60mmE级高强度厚船板钢组织性能的影响。结果表明:与控轧控冷(TMCP)态钢板相比,经880～940℃正火的钢,其抗拉强度降低、延伸率提高,-40℃冲击韧性大幅度提高,这主要是由于正火处理消除魏氏组织以及细化晶粒所致。随着保温时间的延长,晶粒长大不明显。试验钢的最佳正火工艺为880～910℃60min的正火。
The effect of different normalizing temperature and holding time on the microstructure and mechanical properties of high strength E grade shipbuilding steels with 60 mm thickness were investigated by using optical microscope and universal material testing machine. The results showed that comparing with the TMCP （controlled rolling and controlled cooling） specimens, the tensile strength decreased, the elongation increased and -40℃ impact toughness increased dramatically after the test steel normalizing at 880-940℃. The main reason was that normalizing treatment eliminated the Widmanstatten structure and refined the grains. With the prolonging of holding time, the grain size increased unobviausly. The optimum normalizing process of the test steel was soaking at 880-910℃ with 60min.
出处
《上海金属》
CAS
2009年第6期6-10,共5页
Shanghai Metals
基金
上海高等学校本科教育高地建设项目资助
关键词
船板钢
正火处理
力学性能
显微组织
Shipbuilding Steel, Normalization, Mechanical Property, Microstructure
