粉末冶金纯钛的热变形本构方程及热加工图研究  

Constitutive equation and thermal processing map of powder metallurgy pure titanium

作　　者：刘彬[1,2] 曾凡沛 卢金忠 刘咏[2] 曹远奎[2] 

机构地区：[1]福建龙溪轴承(集团)股份有限公司,漳州363000 [2]中南大学粉末冶金研究院,长沙410083

出　　处：《粉末冶金材料科学与工程》2015年第4期499-504,共6页Materials Science and Engineering of Powder Metallurgy

基　　金：国家博士后基金项目(2014M551827);国家自然科学基金项目(51302203);湖南省科技计划项目(2014GK3078)

摘　　要：采用热模拟试验方法研究粉末冶金纯钛在温度为400-700℃、应变速率为0.001-1 s-1的变形条件下的热变形行为,推导出了粉末冶金纯钛的高温变形流变本构方程,建立基于动态材料模型（DMM）的粉末冶金纯钛的加工图。研究结果表明：粉末冶金纯钛的高温流变应力与变形条件之间的关系可用双曲正弦函数描述,其高温变形激活能为221.23 k J/mol;在高应变速率条件下（〉0.1 s-1）变形时,材料发生失稳变形。粉末冶金纯钛的最佳变形参数区间为450~550℃/0.001~0.01 s-1和625~700℃/0.001~0.01 s-1。Deformation behavior of the P/M pure titanium was studied in a temperature range of400-700 ℃ and a strain rate range of 0.001-1 s-1. A constitutive equation was derived with arrhenius hyperbolic sine function and a processing map was constructed. The results show that arrhenius hyperbolic sine fimction can well describe the constitutive equation of the powder metallurgy （P/M） pure titanium. The activation energy is 221.23 kJ/mol. The material shows unstable flow when strain rate is higher than 0.1 s-1, and the best processing regions are 450-550 ℃/0.001-0.01 s-1 and 625-700℃/ 0.001-0.01 s-1.

关 键 词：粉末冶金 钛合金 热变形 本构方程 加工图 

分 类 号：TG146.23[一般工业技术—材料科学与工程]