摘要
通过Gleeble1500热/力模拟实验机对轧后含硼钢板进行了热冲压过程模拟,分析了各种热处理条件对含硼钢组织性能的影响,并采用X射线衍射技术和径迹照相技术分析了硼的偏聚和硼相析出情况。研究结果表明:提高加热温度或延长保温时间,可促进钢的奥氏体化和硼的偏聚。通过偏聚合适含量的硼,能够很好地起到提高淬透性作用,使材料得到全部马氏体组织。热冲压成型过程中的变形破碎了奥氏体组织,促进相变,更易获得细小的马氏体组织。当冷却速度不高时,钢中"硼相"会沿晶界连续析出,从而降低了硼钢的淬透性。
The hot stamping processes of B-bearing steel sheet after hot rolling were simulated at Gleeble 1500, the microstructure and mechanical properties were analyzed at different heat treatment conditions, and the segregation of boron and precipitation of boron phase were investigated by X-ray diffraction analysis and particulate tracking autoradiograph （PTA） technology. It can be found that the boron segregation and austenization of martensite steel were accelerated with the increasing of heating temperature and holding time. The suitable content of boron can provided enough hardenability so that martensitic transformation can be completed thoroughly in the tested steel. The deformation during hot stamping process was able to break austenite and accelerate the phase transformation in order to obtain fine martensite. If cooling rate is not enough high after heating, the boron phase easily precipitates at grain boundary continuously, which leads to the decreasing of hardenability.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2010年第2期69-73,共5页
Journal of Materials Engineering
基金
国家自然科学基金资助项目(50804005)
关键词
热冲压成型
硼钢
马氏体
硼偏聚
hot stamping
boron-bearing steel
martensite
boron segregation
