20Cr2Ni4A钢高温变形行为及物理基参数本构模型  

Elevated temperature deformation behavior and physically-based parameter constitutive model of 20Cr2Ni4A steel

作　　者：王伟 马世博[1] 张双杰[1] 周明博 马瑞 WANG Wei;MA Shi-bo;ZHANG Shuang-jie;ZHOU Ming-bo;MA Rui(Hebei Key Laboratory of Material Near-Net Forming Technology,School of Materials Science and Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,China;CATARC (Tianjin)Automotive Engineering Research Institute Co.,Ltd.,Tianjin 300300,China;Key Laboratory of Advanced Forging & Stamping Technology and Science,School of Mechanical Engineering,Yanshan University, Qinhuangdao 066004,China)

机构地区：[1]河北科技大学材料科学与工程学院河北省材料近净成形重点实验室,河北石家庄050018 [2]中汽研(天津)汽车工程研究院有限公司,天津300300 [3]燕山大学机械工程学院先进锻压成形技术与科学教育部重点实验室,河北秦皇岛066004

出　　处：《塑性工程学报》2018年第6期147-153,共7页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(51475139);河北省自然科学基金资助项目(E2015208105)

摘　　要：采用Gleeble-3500热模拟试验机,在变形温度1073.15~1273.15K,应变速率0.001~1s^-1。下进行了20Cr2Ni4A钢的等温压缩试验。结果表明,20Cr2Ni4A钢的流变应力随变形速率的增加或变形温度的降低而增加。基于峰值应力,分别采用表征参数和物理基参数构建了20Cr2Ni4A钢的Arrhenius型本构模型。结果表明,两种本构模型对峰值应力均具有良好的预测精度。通过对比分析考虑应变影响的两种本构模型,研究了两种本构模型在整个应变范围的预测能力。结果表明,在低应变区,表征参数本构模型的预测值更接近实测值。达到峰值应变后,物理基参数本构模型的预测值与表征参数本构模型的预测值十分接近,均能提供较高的预测精度。The isothermal compression tests of20Cr2Ni4A steel were implemented on Gleeble-3500 thermal simulation machine at de- formation temperatures of 1073.15-1273.15K and strain rates of 0.001-1s^-1.The results show that the flow stress of 20Cr2Ni4A steel increases with the increase of deformation rate or the decrease of deformation temperature.The Arrhenius-type constitutive models of 20Cr2Ni4A steel were derived by using apparent parameter and physically-based parameter respectively based on peak stress.The results show that the two constitutive models both have satisfactory prediction accuracy.The predictive ability of the two kinds of constitutive models in the entire strain range was investigated through comparative analysis of the two kinds of constitutive models which considering the effect of strain.The results indicate that the predicted values of apparent parameter constitutive model are much closer to the measured values in the low strain zone.After reaching the peak strain,the predicted values of physically-based parameter constitutive model are close to the predicted values of apparent parameter constitutive model,and both can provide high prediction accuracy.

关 键 词：20CR2NI4A钢 高温变形行为 表征参数 物理基参数 本构模型 

分 类 号：TG115[金属学及工艺—物理冶金] TG142[金属学及工艺—金属学]