1700MPa级热成形钢的流变行为研究  

Study on rheological behavior of 1700 MPa grade hot stamping steel

作　　者：董瑞[1] 王洪涛[2] 李振亮[1] DONG Rui WANG Hong-tao LI Zhen-liang(Materials and Metallurgy School, Inner Mongolia University of Science and Technology Baotou 014010 China Special Steel Branch Company, Inner Mongolia Baotou Steel Union Co. , Ltd. Baotou 014010, China)

机构地区：[1]内蒙古科技大学材料与冶金学院,内蒙古包头014010 [2]内蒙古包钢钢联股份有限公司特钢分公司,内蒙古包头014010

出　　处：《内蒙古科技大学学报》2016年第4期403-408,共6页Journal of Inner Mongolia University of Science and Technology

基　　金：内蒙古自然科学基金资助项目(2016BS0513);内蒙古科技大学创新基金资助项目(2016QDL-B04)

摘　　要：本文以1 700 MPa级热成形钢为研究对象,进行了热变形模拟实验,研究了不同变形条件下的流变应力-应变曲线,分析了热变形过程中各参数对流变应力的影响,并在已有流变应力模型的基础上提出了本试验钢的流变应力数学模型.结果表明,流变应力均随变形温度的降低呈整体升高趋势;应变速率对流变应力的影响具有双重性;试验钢在热变形过程中的稳态流变应力数学模型和热变形方程分别为σ=22.117 98ln Z-1423.592 3和σ_p=22.117 98lnε＋751.588×10~3/T-423.592 3.流变应力的峰值主要与应变速率和温度有关.Thermal deformation simulation of 1 700 MPa grade hot stamping steel was carried out. Flow stress-strain curve at different deformation conditions and effects of thermal deformation parameters on the flow stress were studied. Modified mathematical model of the test steel was established on the basis of the existing flow stress model. The result shows that,flow stress increases with the decrease of deformation temperature,while the effect of strain rate on flow stress is dual. The flow stress mathematical model and the hot deformation equation are σ = 22. 117 98 ln Z-1423. 592 3 and σ_p= 22. 117 98 ln ε ＋ 751. 588 × 10~3/ T-423. 592 3,respectively. The maximum of flow stress mainly depends on the strain rate and the temperature.

关 键 词：热成形钢 应变速率 变形温度 热变形模型 

分 类 号：TG335.12[金属学及工艺—金属压力加工]