Hot deformation behavior of martensite TiAl alloy

doi:10.13251/j.issn.0254-6051.2022.10.010

Abstract

Abstract: In order to study the hot deformation behavior of martensite TiAl alloy, Ti-42.1Al-8.3V alloy was oil-quenched at 1320 ℃ to obtain martensite structure, and then hot deformed compressively at deformation temperature of 1000-1150 ℃ and strain rate of 0.001-1 s^-1 by using Gleeble-1500D thermal-mechanical simulator. The effect of hot deformation parameters on microstructure of the Ti-42.1Al-8.3V alloy was studied by means of BSE and EBSD, and the constitutive equation was established according to the true stress-true strain curves of the tested alloy and the hyperbolic sine equation. The results show that the flow stress curves of the alloy conform to the dynamic recrystallization characteristics, and the peak stress increases with the decrease of deformation temperature and the increase of strain rate. The constitutive equation of the tested alloy with martensitic structure is established, in which the calculated n value is 2.175, and the deformation activation energy Q is 595.79 kJ/mol. After hot deformation, the martensite arranged in equilateral triangles transforms into α₂/γ lamellar structure. With the increase of deformation temperature and the decrease of strain rate,the lamellar α₂/γ is replaced by recrystallized grains gradually, and completely transforms into equiaxed grains at deformation temperature of 1100 ℃ and strain rate of 0.001 s^-1. In addition, with the decrease of strain rate and the increase of deformation temperature, the grains grow fully and gradually coarsen.

Key words: TiAl alloy, martensite, hot deformation, constitutive equation, microstructure

CLC Number:

TG146.23

Xing Chen, Cheng Liang, Zhu Bin, Chen Yi. Hot deformation behavior of martensite TiAl alloy[J]. Heat Treatment of Metals, 2022, 47(10): 58-64.

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