基于应变影响热加工图的TC4-DT钛合金热成形工艺参数优化（英文）  

Hot Working Parameters Optimization of TC4-DT Titanium Alloy Based on Processing Maps Considering True Strain

作　　者：刘江林[1] 曾卫东[1] 舒滢 谢英杰 杨建朝 

机构地区：[1]西北工业大学凝固技术国家重点实验,陕西西安710072 [2]西部钛业有限责任公司,陕西西安710201

出　　处：《稀有金属材料与工程》2016年第7期1647-1653,共7页Rare Metal Materials and Engineering

基　　金：Major State Basic Research Development Program of China("973"Program)(2007CB613807);Shaanxi Province Science and Technology Integrated Innovation Engineering Project(2012KTZB01-03)

摘　　要：利用Gleeble-3500热模拟试验机,在变形温度为1181~1341 K及应变速率为0.01~10 s^(-1)参数范围内对TC4-DT钛合金进行等温恒应变速率压缩试验。基于加工图理论分析了不同应变条件下应变速率敏感因子、功率耗散因子及失稳区的区别与联系,分析加工图发现:TC4-DT钛合金在1181~1341 K,应变速率为0.01~0.79 s^(-1)之间主要发生动态再结晶/动态回复(DRV/DRX),此区间对应的能量耗散效率大致为45%,当变形发生在温度1181~1211 K,较高应变速率(>1 s^(-1))下,对TC4-DT钛合金加工时易发生流变不稳定现象。Elevated-temperature flow behavior of TC4-DT titanium alloy was investigated by isothermal hot compression tests at strain rate from 0.01 to 10 s^-1 and temperature of 1181-1341 K on Gleeble-3500 simulator.Three criterions including sensitive index of the strain rate（m-value）,power dissipation factor（η-value） and flow instability（ξ-value） at different strains were analyzed by the principle of processing maps.As a result,the temperature at 1181-1341 K and strain rate of 0.01-0.79 s^-1is the optimum region in which dynamic recovery/dynamic recrystallization（DRV/DRX） occurs,and the corresponding power-dissipation efficiency is about45%.The alloy exhibits flow instability regimes due to flow localization at higher strain rates（1 s^-1）.

关 键 词：TC4-DT钛合金 热加工参数 加工图 微观组织 

分 类 号：TG146.23[一般工业技术—材料科学与工程]