文档介绍：
第 44 卷
第 4 期钢铁
Vo l. 44, N o. 4
2 0 0 9 年 4 月 Iron and Steel April
2009
变形温度与冷却速率对含 Nb 中碳钢晶粒细化的影响
赵英利1, 2,
时
捷2 ,
董
瀚2 ,
谢
刚1
( 1. 昆明理工大学材料与冶金工程学院, 云南昆明 650093;
2. 钢铁研究总院结构材料研究所, 北京 100081)
摘
要: 利用 G leeble
1500 热模拟试验机, 以含 N b 中碳钢为研究对象, 研究了不同变形温度与冷却速率对再加热
淬火后奥氏体晶粒细化的影响及其晶粒细化的机制。结果表明: 经热变形后直接淬火+ 再加热淬火工艺得到的奥
氏体晶粒尺寸均小于 10
m, 且随热变形温度的降低, 原奥氏体晶粒由等轴晶粒变成扁平化晶粒, 经再加热淬火
后, 得到的奥氏体晶粒逐渐细化; 与变形后以 5
/ s 冷速缓冷的工艺相比, 变形后直接淬火经再加热淬火后的奥氏
体晶粒细化更明显。
关键词: 晶粒细化; 再结晶; 直接淬火; 逆相变
中图分类号: T G 142
4
文献标识码: A
文章编号: 0449
749X ( 2009) 04
0077
05
Effect of Deformation Temperature and Cooling Rate on Grain
Size Refining of Medium
Carbon Nb
Bearing Steel
ZH AO Ying
li1, 2 ,
SH I Jie2 ,
DONG H an2 ,
XIE Gang1
( 1. School of M aterial and M etallurg y Engineering , Kunming U niv ersity of Science and T echnolog y,
K unming 650093, Yunnan, China;
2. Institute for Structural M ateria ls,
Central Iron and Steel R esearch Institute, Beijing 100081, China)
Abstract: By using Gleeble
1500 machine, the effect of different defo rmatio n temperature and cooling rate o n grain
refinement o f austenite g rains after reheat quenching and the mechanism of g rain refinement were studied. T he re
sults show that austenite g rains size are all less than 10
m by hot defo rm follo wed by direct quenching, and then re
heat quenching , austenite g rains refining wit h