Recrystallization behavior of Ti40 burn-resistant titanium alloy during hot working process  

作　　者：Yun-jin Lai She-wei Xin Ping-xiang Zhang Yong-qing Zhao Fan-jiao Ma Xiang-hong Liu Yong Feng 

机构地区：[1]State Key laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China [2]Western Superconducting Technologies Co., Ltd., Xi'an 710018, China [3]Northwest Institute for Nonferrous Metal Research, Xi'an 710016, China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2016年第5期581-587,共7页矿物冶金与材料学报（英文版）

基　　金：partially supported by the International S&T Cooperation Program of China (ISTCP 2013DFB50180);the National Natural Science Foundation of China (Grant No.51504037)

摘　　要：The recrystallization behavior of deformed Ti40 alloy during a heat-treatment process was studied using electron backscatter dif- fraction and optical microscopy. The results show that the microstructural evolution of Ti40 alloy is controlled by the growth behavior of grain-boundary small grains during the heating process. These small grains at the grain boundaries mostly originate during the forging proc- ess because of the alloy＇s inhomogeneous deformation. During forging, the deformation first occurs in the grain-boundary region. New small recrystallized grains are separated from the parent grains when the orientation between deformation zones and parent grains exceeds a certain threshold. During the heating process, the growth of these small recrystallized grains results in a uniform grain size and a decrease in the av- erage grain size. The special recrystallization behavior of Ti40 alloy is mainly a consequence of the alloy＇s high β-stabilized elemeutal con- tent and high solution strength of the β-grains, which partially explains the poor hot working ability of Ti-V-Cr-type bum-resistant titanium alloys. Notably, this study on Ti40 bum-resistant titanium alloy yields important information related to the optimization of the microstruc- tures and mechanical properties.The recrystallization behavior of deformed Ti40 alloy during a heat-treatment process was studied using electron backscatter dif- fraction and optical microscopy. The results show that the microstructural evolution of Ti40 alloy is controlled by the growth behavior of grain-boundary small grains during the heating process. These small grains at the grain boundaries mostly originate during the forging proc- ess because of the alloy＇s inhomogeneous deformation. During forging, the deformation first occurs in the grain-boundary region. New small recrystallized grains are separated from the parent grains when the orientation between deformation zones and parent grains exceeds a certain threshold. During the heating process, the growth of these small recrystallized grains results in a uniform grain size and a decrease in the av- erage grain size. The special recrystallization behavior of Ti40 alloy is mainly a consequence of the alloy＇s high β-stabilized elemeutal con- tent and high solution strength of the β-grains, which partially explains the poor hot working ability of Ti-V-Cr-type bum-resistant titanium alloys. Notably, this study on Ti40 bum-resistant titanium alloy yields important information related to the optimization of the microstruc- tures and mechanical properties.

关 键 词：titanium alloys hot working RECRYSTALLIZATION microstructural evolution 

分 类 号：TG166.5[金属学及工艺—热处理]