摘要
用Gleeble-3500热模拟试验机对退火态纯钛试样,在变形温度298-723 K、应变速率10^-4-10-1s^-1下进行热压缩试验,研究变形温度和应变速率对其热变形行为及组织演变的影响。结果表明：纯钛的压缩行为与变形温度和应变速率存在相关性;当应变速率一定时,流变应力随变形温度的升高而减小;当变形温度一定时,流变应力随应变速率的增大而增大。显微组织观察结果显示：在低温或高应变速率下变形时,形变组织主要为大尺寸等轴晶和孪晶,随着温度的升高或应变速率的降低,再结晶晶粒逐渐增多,孪晶数量减少,直至消失。
The hot compression tests of annealed pure titanium samples were carried out at the deformation temperature of 298-723 K and strain rate of 10^-4-10~1 s^-1 on a Gleeble-3500 thermal simulation tester. The effects of the deformation temperature and strain rate on the microstructural evolution and the deformation behavior of the pure titanium during the deformation process were investigated. The results show that the compressive behavior of the pure titanium depends on the deformation temperature and strain rate. When the strain rate is constant,the flow stress decreases with the increase of the deformation temperature. When the deformation temperature is constant,the flow stress increases with the increase of the strain rate. The results of microstructure observation show that the deformed microstructures are mainly composed of large equiaxed grains and twins at low deformation temperature or high strain rate. With the increase of deformation temperature and or the decrease of strain rate,the amount of recrystallized grains gradually increases,and that of twins reduces until they finally disappear.
作者
强萌
刘晓燕
杨西荣
杨成
张欠欠
解晨
Qiang Meng;Liu Xiaoyan;Yang XirongI;Yang Cheng;Zhang Qianqian;Xie Chen(School of Metallurgical Engineering, Xi＇an University of Architecture and Technology, Xi＇an Shaanxi 710055, China;Bao Titanium Group Co. , Ltd. , Baoji Shaanxi 721014, China)
出处
《金属热处理》
CAS
CSCD
北大核心
2018年第5期105-109,共5页
Heat Treatment of Metals
基金
国家自然科学基金(51474170)
陕西省自然科学基金(2016JQ5026)
关键词
纯钛
变形温度
应变速率
热变形行为
组织演变
pure titanium
deformation temperature
strain rate
deformation behavior
microstructural evolution
