Microstructural Evolution of Simulated Coarse-Grained Heat-Affected Zone of New HSLA Q690D
The microstructures play an important role in controlling the mechanical properties of a steel.In order to investigate the microstructural evolution of cores-grained heat-affected zone (CGHAZ) of Q690D steels during welding,the Gleeble-1500 simulator is used to simulate the different welding thermal cycle with various cooling rates from 800 to 500℃.The results show that when the cooling rate is higher than10℃/s,the simulated microstructures contain mixtures of lath martensite and bainite.Between the cooling rate of 0.15℃/s and 5℃/s,the simulated microstructure is composed of granular bainite.As the cooling rate is lower than 0.6℃/s,the microstructure is combination of proeutectoid ferrite,pearlite and granular bainite.The mixtures of lath and granular bainite obtained under a cooling rate between 5 ~20℃/s are supposed to be the available microstructures in practice.
microstytructural evolution CGHAZ welding thermal cycle
Lu Hengchang Li Zhe Chen Zhongyi Ma Yonglin
School of Material and Metallurgy, Inner Mongolia University of Science and Technology, 014010, Baot School of Materials Science and Engineering, Wuhan University of Technology, 430070, Wuhan
国际会议
The 4th Australia-China-Japan Joint Symposium on Iron and Steelmaking(第四届中日澳钢铁冶金学术会议)
沈阳
英文
214-218
2012-11-03（万方平台首次上网日期，不代表论文的发表时间）