摘要
利用膨胀法结合金相-硬度法,在Gleeble-1500热模拟试验机上测定了20MnSi钢的临界点Ar1、Ar3、Ac1、Ac3及Ms;同时测定了该钢在不同冷却速度下过冷奥氏体连续冷却时的膨胀曲线,获得了该钢的连续冷却转变曲线(动态CCT曲线);研究了20MnSi钢连续冷却过程中奥氏体转变过程及转变产物的组织和性能。大致找出了避免贝氏体和马氏体产生的冷却速度,初步确定了生产20MnSi钢的控冷速度范围,为生产实践和新工艺的制定提供了参考依据。
Gleeble- 1500 thermal-mechanical simulator was utilized to determine the critical points at A r1, A r3, A c1, Ac3 and Ms for 20MnSi by dilatometric change referring microscopic test and hardness measurement. The continuous cooling transformation curve for 20MnSi steel was obtained by measuring different dilatometric curves of overcooling austenite with different cooling rates. Transformation process of anstenite, the microstructure of transmutation product and mechanical properties were investigated. The cooling rates which avoid the transformation of bainite and martensite are found. The proper range of controlling cooling rates for 20MnSi is determined. All those provide reference for productive practice and developing new technology.
出处
《热加工工艺》
CSCD
北大核心
2009年第18期34-36,共3页
Hot Working Technology
关键词
20MnSi
热模拟
膨胀法
连续冷却转变曲线
20MnSi
thermal-mechanical simulate
dilatometric test
continuous cooling transformation curve
作者简介
包卫平（1977-），男，广西玉林人，博士研究生；电话：010-82376475；E—mail：neubwp@126．com
