摘要
针对我国载重汽车用大梁钢屈服强度低,影响汽车轻量化设计问题,利用MMS-300热力模拟试验机对780MPa级大梁钢进行了单道次压缩实验。结果表明,铌和钛的高温析出物对位错和晶界的钉扎作用和固溶铌的溶质拖曳作用是引起实验钢奥氏体难以发生动态回复和动态再结晶的主要原因,实验钢的动态再结晶激活能达到446.92kJ/mol。通过数据回归建立了实验钢的变形抗力数学模型,该模型具有良好的精度,为超高强大梁钢的稳定化工业生产提供了理论依据。
To the problem of lightweight design difficulty result from the low yield strength of automobile crossbeam steel, the single pass compression experiments of 780MPa crossbeam steel were conducted on MMS-300 multi-function thermo-mechanical simulator. The results show that austenite is difficult to happen dynamic recovery and dynamic recrystallization resuh from pinning effect of carbonitride of Nb and Ti on dislo- cations and grain boundaries and solute drag effect of solid solution Nb. The activation energy of dynamic recrystallization of the steel was up to 446.92kJ/mol. steel was buih by data regressing. The model had producing. The mathematical model of deformation resistance of the good precision for ultra-high-strength erossheam steel
出处
《轧钢》
2012年第5期5-9,共5页
Steel Rolling
基金
国家重点基础发展计划项目(2011CB606306-2)
教育部项目基本科研业务费项目研究生科研创新项目(N090607003)
关键词
大梁钢
变形抗力模型
热变形行为
动态再结晶
微合金钢
crossbeam steel； model of deformation resistance
hot deformation behavior
dynamic recrystallization； microalloyed steel
