摘要
在GLEEBLE热模拟试验机上对变形态Ti40合金进行热压缩实验,采用基于Prasad准则的加工图技术,研究变形态Ti40合金在变形温度950℃~1100℃、应变速率0.001s-1~1.0s-1范围内的微观变形机制和流变失稳现象,并优化该合金的高温变形参数。结果表明,失稳区出现在低温、高应变速率区,当变形温度为950℃~1010℃、应变速率0.13s-1~1.0s-1时,失稳区会出现局部流动,在实际热加工时应尽量避开这一参数范围;变形温度950℃~1100℃、应变速率0.001s-1~0.01s-1为较佳的变形参数范围,其变形机制以动态再结晶为主,伴随动态回复,最佳的变形参数位于温度1050℃、应变速率0.001s-1附近,该区域发生了完全动态再结晶;除失稳区和较佳变形区以外的区域,变形机制以动态回复为主,伴随动态再结晶,是可加工的区域。
Hot compression tests of wrought Ti40 alloy were conducted on the GLEEBLE hot working simulator.Micro-deformation mechanism and the manifestation of flow instability were investigated by means of processing map technology based on Prasad criterion at temperature 950℃~1100℃ and strain rate 0.001s-1~1.0s-1,and deformation parameters were optimized.The results show that the area of flow instability appears at low temperature and high strain rate.At temperature 950℃~1010℃ and strain rate 0.13s-1~1.0s-1,localized flowing may appear at the area of flow instability which should be avoided in practical hot working.Temperature 950℃~1100℃ and strain rate 0.001s-1~0.01s-1 are better range,in which the deformation mechanisms are mainly dynamic recrystallization accompanied with dynamic recovery.The optimum parameters are near 1050℃ and 0.001s-1 accompanying complete dynamic recrystallization.The deformation mechanisms of the regions beside those described above,are mainly dynamic recovery accompanied with dynamic recrystallization,and which can be selected for processing.
出处
《塑性工程学报》
CAS
CSCD
北大核心
2012年第1期81-86,共6页
Journal of Plasticity Engineering
基金
国家自然科学基金资助项目(51005112)
航空科学基金资助项目(2009ZE56014)
关键词
变形态Ti40合金
加工图
变形机制
流变失稳
动态再结晶
wrought Ti40 alloy
processing map
deformation mechanism
flow instability
dynamic recrystallization