【作者】 王凯旋； 曾卫东； 赖运金； 邵一涛； 田飞； 赵永庆； 周义刚；

【Author】 WANG Kaixuan~(1,2),ZENG Weidong~1,LAI Yunjin~2,SHAO Yitao~1,TIAN Fei~1,ZHAO Yongqing~2,ZHOU Yigang~1 (1 State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an 710072,China; 2 Northwest Institute for Nonferrous Metal Research,Xi’an 710016,China)

【机构】 西北工业大学材料学院凝固技术国家重点实验室； 西北有色金属研究院；

【摘要】 通过热压缩试验研究了具有初始片层组织的Ti-17钛合金在780～860℃和应变速率0.001～10s^-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,其流动应力本构关系可以用双曲正弦方程和Zener-Hollomon参数描述,得到Ti-17合金在两相区变形的平均激活能为488.86KJ·mol^-1。显微组织分析发现:片层组织的球化是Ti-17合金在两相区变形的主要特征;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。更多还原

【Abstract】 The hot deformation behavior and microstructure evolution of Ti-17 titanium alloy with initial lamellar structure were studied in the temperature range 780⁸60℃and strain rate range 0.001～10s^-1 by hot compression tests.Characteristics of Stress strain curves of the alloy deformed with the test parameters were analyzed.The constitutive relation of Ti-17 titanium alloy under high temperature conditions can be described by hyperbolic-sine-type equation and Zener-Hollomon parameter,and the deforming activation energies inα+βphase field was 488.86KJ·mol^-1.The main evolution character of the microstructure is the globularization of lamellae. and the degree of dynamic globularization of lamellae increased with increasing strains,increasing temperature and decreasing strain rate.更多还原