退火温度对超低碳钢ECAP变形组织的影响  

Effect of Annealing Temperature on the Microstructure of Ultra Low Carbon Steel Processed by Equal Channel Angular Pressing

作　　者：赵西成[1] 姚筱春[2] 刘晓燕[1] 杨西荣[1] 

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055 [2]宝山钢铁股份有限公司宝钢分公司制造管理部,上海201900

出　　处：《材料热处理学报》2005年第6期80-82,共3页Transactions of Materials and Heat Treatment

基　　金：陕西省教育厅专项基金项目(03JK134);西安建筑科技大学重大科技项目创新基金项目(ZX0506)

摘　　要：采用BC方式通过等径弯曲通道变形(Equal Channel Angular Pressing,简称ECAP)法制备了铁素体晶粒尺寸约0.30μm的超低碳钢试样,研究了退火温度对ECAP变形组织的影响.结果表明,随退火温度升高,ECAP变形获得的亚微晶铁素体变形组织在原位逐渐演变为再结晶组织.300～500℃×1h退火时,亚微晶铁素体组织稳定,晶粒无明显长大.退火温度高于500℃后,铁素体晶粒开始明显长大,650℃退火后的铁素体平均晶粒尺寸约8.70μm.The microstructure with a submicrometer ferrite grain size of about 0.30 μm in an ultra-low carbon steel was obtained by four passes of equal channel angular pressing (ECAP) via route BC at room temperature, and the effect of annealing on the ECAP deformed microstructure was examined. The results show that with annealing temperature increasing, the ECAP deformed microstructure is evoluted into recrystallized grains in-situ. Under the conditions annealed in the range of 300°C-500°C for 1 h, the submicrometer ferrite microstructure is relatively stable with negligible grain growth. Annealing at temperatures above 500°C, the ferrite grain starts to grow significantly, and there is an average grain size of -8.70 μm after annealing at 650°C for 1 h.

关 键 词：等径弯曲通道变形 超低碳钢 亚微晶铁素体 退火 

分 类 号：TG111.7[金属学及工艺—物理冶金] TG142.1[金属学及工艺—金属学]