Effect of solution treatment on microstructure and hardness of TC4 alloy

doi:10.13251/j.issn.0254-6051.2022.06.017

Abstract

Abstract: TC4 alloy was subjected to different solution treatments, and effects of solution temperature, holding time and cooling method on microstructure and hardness of the alloy were studied. The results show that with the increase of solution temperature, microstructure of the TC4 alloy transforms from equiaxed structure to dual-state structure to full martensite structure, and the hardness gradually increases. When the high temperature equilibrium state is reached, the extension of holding time has little effect on microstructure and hardness of the TC4 alloy. When the solution temperature is 925 ℃ and 975 ℃, respectively, as the cooling rate decreases, the α phase diffuses and grows during the cooling process. The β transformation structure changes from α' martensite to secondary α+β lamella structure, and the hardness respectively reduces from 359-389 HV0.2 under water-cooling condition to 318-327 HV0.2 under air-cooling condition. After furnace cooling, a fully equiaxed structure is obtained, the hardness is lower, about 300 HV0.2.

Key words: TC4 alloy, solution, microstructure, hardness

CLC Number:

TG166.5

Han Haoyuan, Yang Tao, Qiu Juan, Yang Gang, Yu Wanhua, Zhai Yuewen, Zhou Leyu. Effect of solution treatment on microstructure and hardness of TC4 alloy[J]. Heat Treatment of Metals, 2022, 47(6): 93-97.

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