王建平
,
杨志刚
,
白秉哲
,
方鸿生
,
冯勇
,
徐洪庆
金属学报
通过Gleeble--1500热力模拟实验机对仿晶界型铁素体/粒状贝氏体复相钢进行了A r3以上不同温度、不同形变量的平面应变压缩实验. SEM和TEM观察表明, 奥氏体形变不仅细化仿晶界型铁素体, 而且促进先共析铁素体在原奥氏体晶内形核, 从而有利于细化粒状贝氏体晶团及其内部的铁素体片条和MA岛.给出的组织变化模型可阐述形变对粒状贝氏体精细结构的影响. 经过780℃下30%形变, 即使在形变后空冷的条件下也获得了平均长度小于5 m、平均宽度小于2.5 m的仿晶界型铁素体晶粒、平均粒径小于3 m的晶内铁素体. 与未经过形变的试样相比, CVN常温冲击韧性值从未形变的43 J提高到108 J, Vickers硬度从242提高到312, 为工业生产工艺的改进提供了重要根据.
关键词:
晶粒细化
,
austenite deformation
,
granular bainite
LI Jian SUN Fuyu Central Iron and Steel Research Institute
,
Beijing
,
China Engineer
,
Department No.4
,
Central Iron and Steel Research Institute
,
Ministry of Metallurgical Industry
,
Beijing 100081
,
China
金属学报(英文版)
The volume fraction of proeutectoid ferrite transformed from deformed austenite fv as a func- tion of isothermal time t has been investigated in 0.037% Nb microalloyed steel.The results show that lnln(1-fv)~(-1) vs Int relation does not follow the Avrami equation strictly and con- sists of two straight lines.By comparing the differences between the results and Cahn's theory, the authors' idea has been expounded.
关键词:
austenite deformation
,
null
,
null
