Granular bainite formation in 2.25Cr-1Mo-0.25V steel under accelerated cooling conditons
The new generation hydro-cracking and hydro-desulfurization reactors are usually made of the 2.25Cr-1Mo-0.25V steel.After austenization at 940℃ of the hot-rolled sample,the study show that the microstructures of the steel after water quenched to 750℃ and then air cooling to room temperature were composed of granular bainite and some short rod carbides.It can be found that the granular bainite consists of irregular equiaxed or wide lath bainitic ferrite matrix,Martensite-Austenite (M-A) island constituents.Such great difference between the morphology of two type of granular bainite sufficiently indicates that their formation mechanisms are quite different.Many short rods precipitated in the wide ferrite laths and distributed parallel to the lath boundaries and its maybe a result that the carbon supersaturation in the bainitic lath was bigger than the equiaxed bainitic ferrite matrix.
2.25Cr-1Mo-0.25V steel accelerated cooling granular bainite formation mechanisms Funding
Zhang Yongtao Liu Heping Shang Hailong Wu Binghui Li Rongbin Huang Liqing Li Jianxin
School of Mechanical Engineering, Shanghai Dianji University, Shanghai 200245, China School of Materials Science and Engineering, North University of China Taiyuan 030051, China School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, China
国际会议
上海
英文
23-23
2012-10-19（万方平台首次上网日期，不代表论文的发表时间）