片层组织TC17钛合金高温变形行为研究  

Hot Deformation Behavior and Microstructure Evolution of TC17 Titanium Alloy

作　　者：王华[1] 冀胜利 王凯旋[3] 曾卫东[3] 

机构地区：[1]海军装备部,陕西西安710021 [2]陕西宏远航空锻造有限责任公司,陕西三原713801 [3]西北工业大学材料学院,陕西西安710072

出　　处：《钛工业进展》2010年第6期16-19,共4页Titanium Industry Progress

基　　金：国家973计划资助项目(2007CB613807);新世纪优秀人才支持计划(NCET-07-0696);凝固技术国家重点实验室开放课题(35-TP-2009)

摘　　要：通过热压缩试验研究了具有初始片层组织的TC17钛合金在780~860℃和应变速率0.001~10 s-1范围内的热变形行为和组织演变。分析了该合金在两相区变形的应力-应变曲线特征,其流变应力本构关系可以用双曲正弦方程和Zener-Hollomon参数描述,得到TC17合金在两相区变形的平均激活能为488.86 kJ.mol-1。显微组织分析发现：TC17合金在两相区变形时组织演变的主要特征是片层组织球化;热变形参数严重影响片层组织球化过程的进行,加大变形量、降低应变速率以及提高变形温度可以提高片状组织的动态球化程度。The hot deformation behavior and microstructure evolution of TC17 titanium alloy with initial lamellar structure were studied in the temperature range 780 - 860 ℃ and strain rate range 0. 001 - 10 s^-1 by hot compression tests. Characteristics of Stress strain curves of the alloy deformed with the test parameters were analyzed. The constitutive relation of TC17 titanium alloy under high temperature conditions can be described by hyperbolic-sine-type equation and Zener-Hollomon parameter, and the deforming activation energies in α＋β phase field is 488.86 kJ· mol^-1. The main evolution character of the microstructure is the globularization of lamellar, and the degree of dynamic globularization of lamellar increases with increasing strains, increasing temperature and decreasing strain rate.

关 键 词：TC17钛合金 片层组织 流变应力方程 动态球化 

分 类 号：TG146.23[一般工业技术—材料科学与工程]