摘要
利用Gleeble-1500型热模拟试验机研究了冷却速率对BR1500IHS热成形钢相变的影响,借助Origin软件绘制了该钢的动态连续冷却转变(CCT)曲线,并对试验钢进行了显微组织观察和显微硬度测试。结果表明:BR1500HS热成形钢在连续冷却过程中存在珠光体、贝氏体和马氏体转变;试验钢在0.5～1℃·s^(-1)低冷速条件下的相变产物为铁素体和珠光体;冷速为5℃·s^(-1)时,开始出现贝氏体相变;冷速高于5℃·s^(-1)后的相变产物为马氏体和贝氏体,冷速大于20℃·s^(-1)后只有马氏体相变。
In order to investigate effects of cooling rate on phase transition of hot stamping steel BR1500HS, dynamic continuous cooling transformation （CCT） behaviors of the steel were simulated on Gleeble-1500 thermomechanical simulator assisted by Origin software. And microstructure observation and micro-hardness test were carried out as well. The results show that the transformation of pearlite, bainite and martensite occured in the continuous cooling process. The ferrite and pearlitic could be obtained with the cooling rates of 0. 5--1 ℃· s 1. The microstructure was bainite with the cooling rate of 5 ℃ · s-1. And the cooling rates was higher than 5 ℃ · s-1 ,martensite transformation also started. Only the martensite appeared when the cooling rate was greater than 20 ℃ · s-1.
出处
《机械工程材料》
CAS
CSCD
北大核心
2013年第2期10-12,共3页
Materials For Mechanical Engineering
基金
上海市数字化汽车车身工程重点实验室资助项目(201003)
关键词
热成形钢
动态CCT曲线
冷速
相变
hot stamping steel
dynamic continuous cooling transformation curve
cooling rate
phase trans-formation
