摘要
采用Gleeble-1500D热模拟试验机对QCr0.5合金进行高温热压缩试验,研究了变形温度400~900℃,应变速率0.01~10 s-1,总压缩应变量50%条件下合金的热变形行为,并依据动态材料模型(DMM)建立了QCr0.5合金的热加工图。结果表明:相同应变速率下,QCr0.5合金的流变应力峰值随温度的升高而减小;应变速率为0.01~5 s-1,变形温度为400~800℃时,合金的软化机制主要为动态回复,变形温度为900℃时合金软化机制则主要为动态再结晶;应变速率为10 s-1,变形温度为500~900℃时,合金表现出较为复杂的动态软化和加工硬化机制;试验条件下,QCr05合金热变形最合理的工艺参数为变形温度785~890℃,应变速率0.06~0.25 s-1。
High temperature hot compression experiments of QCr0.5 alloy were carried out on Gleeble-1500D thermal simulation machine.The hot deformation behavior of QCr0.5 alloy under deformation temperature of 400-900℃,strain rate of 0.01-10 s-1 and total compression strain of 50%was studied,and the hot processing maps of QCr0.5 alloy were established based on dynamic material model(DMM).The results show that at the same strain rate,the peak flow stress of QCr0.5 alloy decreased with increasing temperature.When the strain rate was 0.01-5 s-1 and the deformation temperature was 400-800℃,the alloy softening mechanism was mainly dynamic recovery,and when the deformation temperature was 900℃,the alloy softening mechanism was mainly dynamic recrystallization.The alloy exhibited a more complicated dynamic softening and work hardening mechanism at the strain rate of 10 s-1 and the deformation temperature of 500-900℃.Under test conditions,the most reasonable process parameters for QCr0.5 alloy thermal deformation were the deformation temperature of 785-890℃,and the strain rate of 0.06-0.25 s-1.
作者
张帅帅
张彦敏
宋宇
韩文奎
宋克兴
ZHANG Shuaishuai;ZHANG Yanmin;SONG Yu;HAN Wenkui;Song Kexing(School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471023,China;Henan Key Laboratory of Advanced Non-Ferrous Metals,Luoyang 471023,China)
出处
《机械工程材料》
CAS
CSCD
北大核心
2020年第S02期18-23,28,共7页
Materials For Mechanical Engineering
基金
国家重点研发计划资助项目(2016YFB0300404)
河南省杰出人才创新基金资助项目(18210151003)
河南省重点攻关项目(20174GJPT1)
关键词
QCr0.5合金
本构方程
热压缩
热加工图
QCr0.5 alloy
constitutive equation
thermal compression
hot processing map
