摘要
采用Gleeble-1500D热模拟试验机研究机械合金化制备的ODS-310合金在变形温度为1050～1150℃、应变速率为0.001～1 s-1条件下的高温变形行为，测定其真应力-应变曲线，分析其流变应力与应变速率及变形温度三者之间的关系，并采用Zener-Hollomon参数法建立ODS-310合金的高温变形本构方程，基于动态材料模型，构造 ODS-310合金的热加工图。结果表明：ODS-310合金的流变应力随变形温度降低或应变速率提高而增大；该合金热变形过程中的流变行为可用双曲线正弦模型来描述，在实验条件下的平均变形激活能为828.384 kJ/mol；真应变为0.4的热加工图表明，ODS-310合金在高温变形时存在2个加工失稳区，即变形温度为1050～1070℃、变形速率为0.01～1s-1的区域，和变形温度为1130～1150℃、变形速率为0.1～1 s-1的区域；ODS-310合金的最佳变形温度和应变速率分别为1150℃和0.001 s-1。
Hot deformation behavior of ODS-310 alloy was investigated by conducting hot compression deformation tests on Gleeble-1500D simulator at the temperatures range of 1 050～1 150℃and the strain rate range of 0.001～1 s-1. True stress-true strain curves were obtained. The effects of strain rate and deformation temperature on flow stress were analyzed. The constitutive equation of the ODS-310 alloy at high temperatures was obtained by introducing Zener-Hollomom parameter. The processing map of ODS-310 was proposed on basis of dynamic materials model. The results show that the flow stress increases with the decrease of the deformation temperature and the increase of the strain rate. The flow behavior of ODS-310 alloy can be described by the hyperbolic sine model and the activation energy is about 828.384 kJ/mol. The processing map established at the true strain of 0.4 shows that there are two flow instability zones, including the zone at temperatures range of 1 050～1 070℃and strain rate range of 0.01～1s-1,and the other zone at temperatures range of 1 130～1 150 ℃ and strain rate range of 0.1～1 s-1. The optimal processing parameters are the temperature of 1 150 ℃ and strain rate of 0.001 s-1.
出处
《粉末冶金材料科学与工程》
EI
北大核心
2014年第2期177-183,共7页
Materials Science and Engineering of Powder Metallurgy
基金
国家重点基础研究发展规划(973计划)资助项目(2007CB209800)
关键词
ODS-310合金
热变形行为
变形激活能
本构方程
热加工图
ODS-310 alloy
hot deformation behavior
deformation activation energy
constitutive equation
processing map
