C-Mn钢冷轧薄板等温退火微观组织演变  

Microstructure Evolution of C-Mn Steel Cold Rolled Sheet During Isothermal Annealing Process

作　　者：郭俊锋[1] 周旭东[1] 王顺兴[1] 李俊[2] 王健[2] 

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471023 [2]宝山钢铁股份有限公司研究院,上海201900

出　　处：《河南科技大学学报（自然科学版）》2015年第4期9-13,4-5,共5页Journal of Henan University of Science And Technology:Natural Science

基　　金：国家特大型轴类锻件损伤控制及工艺参数稳健优化方法研究基金项目(51072240)

摘　　要：利用光学显微镜,探讨等温退火工艺中退火温度和保温时间对C-Mn钢组织的影响,尤其是对铁素体再结晶、魏氏体和托氏体相变的影响。研究结果表明:加热温度在750℃以下时,以铁素体回复再结晶为主,退火温度升高及保温时间延长均能增加铁素体再结晶程度,但晶粒长大不明显。退火温度在850℃以上时,相变发生在冷却过程中,以魏氏体、托氏体相变为主,且保温过程中奥氏体晶粒越大,冷却时魏氏体和托氏体转变量越多,铁素体含量越少。Effects of annealing temperature and holding time in the isothermal annealing process on microstructure of C-Mn steel were studied by means of optical microscope. And the influence on ferrite recrystallization,widmanstatten and troostite phase transformation was analyzed. The results indicate that ferrite recrystallization is mainly happened when the heating temperature is at less than 750 ℃. With the increasing of annealing temperature and holding time,the degree of ferrite recrystallization is increased,but grain growth is not obvious. When the annealing temperature is above 850 ℃,phase transformation occurs in the cooling process,which gives priority to the widmanstatten and troostite phase transformation. As the grain size of austenite during heat preservation process increases,there are more widmanstatten and troostite phase transformation in the cooling time,and less content of ferrite.

关 键 词：退火温度 显微组织 回复再结晶 

分 类 号：TG156.2[金属学及工艺—热处理]