摘要
采用Gleeble-1500D热模拟试验,研究了马氏体沉淀硬化不锈钢0Cr15Ni5Cu3Nb(15-5PH)在850~1250℃、0.001~1 s^(-1)条件下的热变形行为和微观组织演化机制。研究结果表明:材料变形过程存在加工硬化、动态软化和流变稳态的特征。利用Arrhenius型双曲正弦方程,建立了15-5PH热变形本构模型ε·=4.336×1018[sinh(0.011×σ)]^(5.817) exp(-519543/RT)。该模型预测值与试验值平均相对误差7.1%,能较好地描述15-5PH热变形行为。15-5PH在高应变速率条件下可能发生流变失稳现象。热变形过程,15-5PH可发生动态再结晶现象,动态再结晶晶粒尺寸和体积分数随着温度的升高或应变速率的降低而增加。
The hot deformation behaviors of martensitic precipitation-hardening steel 0Cr15Ni5Cu3Nb(15-5PH)at temperature of 850~1250℃and deformation rate of 0.001~1 s^(-1) were studied through Gleeble-1500D hot modeling test machine.The results show that the characteristics of work hardening,dynamic softening and rheological steady-state exist at material flow curve.A hyperbolic type constitutive modelε·=4.336×10^(18)[sinh(0.011×σ)]^(5.817) exp(-519543/RT)is established for the 15-5PH.The average relative error between predicted value and measured value is 7.1%,which indicates the accuracy of the constitutive model.The processing map indicates that flow instability may occur at higher strain rates.An obvious dynamic recrystallization phenomenon can take place in the thermal deformation process of 15-5PH.With increasing temperature or decreasing strain rate,the recrystallized grain size and volume fraction increase.
作者
石如星
禹兴胜
何文武
元亚莎
毛丰
武川
SHI Ruxing;YU Xingsheng;HE Wenwu;YUAN Yasha;MAO Feng;WU Chuan(Luoyang CITIC HIC Casting and Forging Co.,Ltd.,Luoyang 471039,China;College of Materials Science&Engineering,Taiyuan University of Science and Technology,Taiyuan 030027,China;National Joint Engineering Research Center for Abrasion Control&Molding of Metal Materials,Henan University of Science&Technology,Luoyang 471003,China;National Local Joint Engineering Laboratory of Intelligent Manufacturing Oriented Automobile Die&Mold,Tianjin University of Technology and Education,Tianjin 300222,China)
出处
《河南科技大学学报(自然科学版)》
CAS
北大核心
2021年第4期7-15,M0002,M0003,共11页
Journal of Henan University of Science And Technology:Natural Science
基金
国家重点研发计划基金项目(2020YFB2008400)。
关键词
马氏体不锈钢
热变形
本构模型
热加工图
动态再结晶
martensitic precipitation-hardening steel
thermal deformation behavior
constitutive model
hot working map
dynamic recrystallization