Research on the Characteristics of Hot Deformation in BT20 Titanium alloy and Its Optimum Spinning Temperature Range

作     者：Wenchen XU+, Debin SHAN, Yan LU and Chunfeng LISchool of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China 

作者机构：School of Materials Science and Engineering Harbin Institute of Technology 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2005年第21卷第6期

页      面：807-812页

核心收录：

学科分类：080503[工学-材料加工工程] 0817[工学-化学工程与技术] 0806[工学-冶金工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0802[工学-机械工程] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 080201[工学-机械制造及其自动化] 

主　　题：Dynamic recrystallization Dynamic recovery Phase transformation Optimumtemperature Tubular spinning BT20 titanium alloy 

摘      要：Hot compression tests were conducted on a Gleeble-1500 simulator to investigate the hot deformation behavior of BT20 Ti alloy （Ti-6Al-2Zr-IMo-1V） in the temperature range from 550 to 1000℃ at constant strain rate in the range of 0.01-1s^-1, and then the optimum spinning temperature range was determined. Moreover, tube spinning experiments were executed to verify the reasonability of the optimum temperature range. The results show that the flow stress declines gradually with increasing deformation temperature and decreasing strain rate. In α＋β phase region the dynamic recrystallization is the main softening mechanism and in β phase region the hot deformation softening is controlled by dynamic recovery. In α＋β phase region with reducing strain rate dynamic recrystallization is fully developed. The optimum temperature of hot spinning is 850-900℃ and that of warm spinning is 600-650℃. Meanwhile, at the temperature above 600℃ tubular workpieces of BT20 Ti alloy have been spun without surface cracks and microstructure inhomogeneity, which proves that the optimum spinning temperature range obtained through hot compression experiments is reasonable.