20Mn钢降温连续形变过程铁素体的形成特点及动态CCT曲线  

FERRITE FORMATION IN CONTINUOUS COOLING AND DEFORMATION AND ITS DYNAMIC CURVES FOR STEEL 20Mn

作　　者：杨平[1] 郝广瑞[2] 崔凤娥[2] 孙祖庆[2] 

机构地区：[1]北京科技大学材料学院材料学系,副教授北京市100083 [2]北京科技大学

出　　处：《钢铁研究》2002年第5期7-10,38,共5页Research on Iron and Steel

基　　金：国家重点基础研究项目 (G19980 6 15 0 6 );教育部资助项目

摘　　要：利用单向压缩热模拟试验考察了 2 0Mn钢降温连续变形时铁素体的形成特点 ,并与等温转变作了比较 ;用金相法建立了动态CCT曲线。高温形变影响铁素体的形态和分布。形成超细等轴铁素体的适宜温度范围在Ar3 和A3 之间 ( 72 0～ 770℃ )。Hot compression simulating tests were made for Steel 20Mn to inspect the ferrite formation in conditions of continuous cooling and deformation. The features of ferrite formation were compared to the isothermal deformation enhanced transformation. The dynamic CCT curves of 20Mn were obtained by traditional metallographic method. Deformation at high temperatures may lead to changes of ferrite morphology and distribution. Suitable temperature range for equalaxial ultra-fine ferrite grains is between Ar 3 and A 3(720～770?℃). Structures obtained at constant deforming temperatures are better than those at declining temperatures.

关 键 词：铁素体 CCT曲线 形变 热模拟试验 金相 晶粒 变形 连续 超细 

分 类 号：TF741.344[冶金工程—钢铁冶金] TG[金属学及工艺]