摘要
采用Gleeble1500热模拟机进行了热压缩试验,研究了TC18钛合金在温度700～950℃,应变速率0.001～10 s-1条件下的高温压缩变形行为,并根据应力-应变曲线建立了合金的加工图。研究结果表明:合金在两相区温度变形,应力-应变曲线呈现流变软化特征;而在单相温度区和高应变速率下,合金表现出间断的屈服现象。合金适宜的加工条件为T=700～850℃,ε=0.01～0.001s-1与T=850～900℃,ε=1～10s-1。合金热加工失稳区为T=700～750℃,应变速率为0.1～10s-1区域。
The hot deformation behaviors of TC18 alloy were investigated at temperature from 700℃ to 950 ℃ and strain rate from 0.001 s-1 to 10 s-1 by using Gleeble 1500 thermal simulation machine. The Processing map was established based on true flow stress-true strain curves of TC18 alloy. The results indicate that the stress-strain curves have significantly softened characteristics in the two-phase region temperature. And under the temperature in the single-phase region and at high strain rates, alloy show discontinuous yielding phenomenon. The feasible processing conditions of TC 18 titanium alloy are temperature from 700 ℃ to 850 ℃, strain rate from 0.01 s^-1 to 0.001 s-1 and temperature from 850 ℃ to 950 ℃, strain rate from 1 s-1 to 10 s-1. The instability domain of hot working is temperature from 700 ℃ to 750 ℃ and strain rate about from 0.1s-1 to 10 s-1.
出处
《热加工工艺》
CSCD
北大核心
2012年第21期24-28,共5页
Hot Working Technology
关键词
钛合金
高温变形
加工图
组织演变
titanium alloy
high temperature deformation
processing map
microstructure revolution
