摘要
通过测定590 MPa级含0.2%Nb的0.12C-1.17Si-1.7Mn相变诱导塑性热轧钢板CCT曲线和临界冷却速率,研究了不同冷却速率对组织的影响。结果表明,该钢板CCT曲线的临界冷却速率为40℃/s,Ac1为690℃,Ac3为880℃,Ms为476℃;冷却速率为8℃/s时组织中出现贝氏体,冷却速率为40℃/s时出现马氏体,确定该钢种的临界冷却速率为40℃/s;添加Nb元素有利于扩大该钢热轧工艺技术窗口。
By measuring the CCT curve and critical cooling rate of thermoplastic hot-rolled steel sheet induced by 0.12 C-1.17 Si-1.7 Mn phase transformation of 590 MPa grade 0.2% Nb,the effects of different cooling rates on microstructure were studied.The results show that the steel plate CCT curve of the critical cooling rate of 40 ℃/s,Ac1 is690 ℃,Ac3 is 880 ℃ and Ms is 476 ℃;When the cooling rate is 8 ℃/s,microstructure appear bainite,and martensite will appear with the cooling rate of 40 ℃/s,as a results,the critical cooling rate of the steel grade should be 40 ℃/s.Adding Nb element is helpful to expand the window of hot rolling process.
作者
高志国
徐流杰
魏世忠
GAO Zhiguo;XU Liujie;WEI Shizhong(College of Mechanical and Electrical Engineering,Wuyi University,Wuyishan 354300,China;College of Material Science and Engineering,Henan University of Science and Technology,Luoyang 471023,China)
出处
《铸造技术》
CAS
2018年第11期2558-2560,共3页
Foundry Technology
基金
长江学者和创新团队发展计划(IRT1234)
关键词
冷却速率
相变诱导塑性钢
CCT曲线
金相组织
cooling rate
phase transformation induced plasticity steel
CCT curve
metallographic structure
