Phase Transformation, Recrystallization and Microstructure Control During Hot Deformation of Ti-44Al-5Nb-1Mo-(V,B) Alloy
GUO Ruiqi1, WANG Xiuqi1, LIU Guohuai1, LI Tianrui2, WANG Zhaodong1
1 State Key Laboratory of Rolling and Automation, Northeast University, Shenyang 110819, China 2 College of Metallurgical Engineering, Anhui University of Technology, Maanshan 243000, Anhui, China
Abstract: The intrinsic brittleness of TiAl alloy leads to its poor deformability, which severely limits the wide application of TiAl alloy.In this work, the homogenized Ti-44Al-5Nb-1Mo-(V, B) alloy was taken as the research object, and the effects of deformation conditions on the microstructure of TiAl alloy were discussed from four aspects (deformation temperature, deformation amount, deformation rate and holding time) by thermal simulation single pass compression experiment. The results show that at the initial stage of thermal compression deformation, the first thing that happens is the bending deformation of lamellar, and some sheets are “broken” (induced by recrystallization and phase transformation). With the deformation gradually increasing to 40%, the equiaxed grains produced by lamellar “crushing” increase, and the residual lamellar clusters decrease obviously. In addition, the increase of deformation temperature and the decrease of strain rate can promote the occurrence of dynamic recrystallization and phase transformation behaviors such as L(α2/γ)→γ+β+α. With the increase of holding time, the recrystallization degree of grains increases. Deformation temperature of 1 200—1 250 ℃, strain rate of 0.01 s-1, deformation of 60% and holding time of 1 800 s are the best conditions for recrystallization and phase transformation of this alloy, uniform and fine near-full lamellar structure can be obtained.
郭瑞琪, 王秀琦, 刘国怀, 李天瑞, 王昭东. Ti-44Al-5Nb-1Mo-(V,B)合金热变形过程中的相变、再结晶行为及组织调控[J]. 材料导报, 2022, 36(Z1): 22010111-6.
GUO Ruiqi, WANG Xiuqi, LIU Guohuai, LI Tianrui, WANG Zhaodong. Phase Transformation, Recrystallization and Microstructure Control During Hot Deformation of Ti-44Al-5Nb-1Mo-(V,B) Alloy. Materials Reports, 2022, 36(Z1): 22010111-6.
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