船用曲轴S34MnV钢的物理基参数本构模型及热加工图  

Physically based parameter constitutive model and hot processing map of marine crankshaft S34MnV steel

作　　者：李亨[1] 张振威 李润 朱元健 刘宁[3] 阮树荣 LI Heng;ZHANG Zhen-wei;LI Run;ZHU Yuan-jian;LIU Ning;RUAN Shu-rong(Anhui Province Key Lab of Aerospace Structural Parts Forming Technology and Equipment,Hefei University of Technology,Hefei 230009,China;Ningbo Branch of Chinese Academy of Ordnance Science,Ningbo 315103,China;School of Materials Science and Engineering,Hefei University of Technology,Hefei 230009,China;Jiangsu Sunan Heavy Machinery Technology Co.,Ltd.,Changshu 215512,China)

机构地区：[1]合肥工业大学航空结构件成形制造与装备安徽省重点实验室,安徽合肥230009 [2]中国兵器科学研究院宁波分院,浙江宁波315103 [3]合肥工业大学材料科学与工程学院,安徽合肥230009 [4]江苏苏南重工机械科技有限公司,江苏常熟215512

出　　处：《塑性工程学报》2021年第1期131-137,共7页Journal of Plasticity Engineering

基　　金：国家重点研发计划重点专项(2017YFB0701804,2017YFB0701803)。

摘　　要：采用Gleeble-3500型热模拟机对大型船用曲轴S34MnV钢在变形温度950~1150℃,应变速率0.005~5 s-1,压缩变形量为60%的条件下进行热压缩试验,获得了S34MnV钢的真应力-应变曲线。基于位错-应力关系和动态再结晶动力学,建立了两阶段的物理基参数本构模型来预测船用曲轴S34MnV钢的热变形流动应力,预测结果与试验结果对比表明,相关系数R和平均绝对相对误差AARE分别为0.986和6.374%,反映了建立的本构模型具有较高的预测精度;通过在Prasad和Murty两种失稳判据下建立的热加工图对比以及微观组织观察,建议S34MnV钢最佳热加工窗口为:应变速率0.03~0.562 s^-1,变形温度为995~1150℃,在此工艺参数下S34MnV钢具有良好的热加工性能。Gleeble-3500 thermal simulator was used to conduct thermal compression tests on large marine crankshaft S34 MnV steel at deformation temperature of 950-1150℃,strain rate of 0.005-5 s-1 and compression deformation amount of 60%,and the true stressstrain curves of S34 MnV steel were obtained.Based on the dislocation-stress correlation and dynamic recrystallization kinetics,a two-stage physically based parameter constitutive model was established to predict the thermal deformation flow stress of the marine crankshaft S34 MnV steel,and the contrast of predicted results and experimental results shows that the correlation coefficient R and the average absolute relative error AARE are 0.986 and 6.374%,respectively,reflecting the high prediction accuracy of the established constitutive model.Based on the comparison of hot processing map established under Prasad and Murty instability criteria and microstructure observation,the optimal hot working window of S34 MnV steel is suggested as strain rate of 0.03-0.562 s^-1,deformation temperature of 995-1150℃.Under this process parameter,S34 MnV steel has good hot working performance.

关 键 词：S34MnV钢 船用曲轴 本构方程 物理基参数 热加工图 

分 类 号：TG142.33[金属学及工艺—金属材料]