热处理对TiAl基合金喷丸试样组织与性能的影响

doi:10.3976/j.issn.1002-4026.2023.02.008

Abstract

Abstract:

Because TiAl alloys are susceptible to fatigue cracking on their surfaces due to cyclic loading when used at high temperatures, it is necessary to treat their surfaces to improve their mechanical properties. In this study, TiAl alloy was subjected to shot peening tests at room temperature, using 0.2 mm diameter steel shots at 0.7 MPa air pressure. The shot peening simulation studies were conducted using ABAQUS finite element analysis software. Subsequently, the shot-peened specimens were heat treated at different temperatures and holding times. The cross-sectional microstructures of the specimens were observed using a scanning electron microscope (SEM), the residual compressive stresses on the surfaces were measured using an X-ray residual stress meter, and the surface microhardness after heat treatment was measured using a microhardness meter. The results showed that many pits and lamellar protrusions appeared on the surface of TiAl alloy after shot peening, and obvious plastic deformations and numerous deformation twins appeared at the secondary surface. The residual compressive stress on the surface of the TiAl alloy after heat treatment decreased as the holding time and heat treatment temperature increased. Hardness followed a similar trend as the residual stress; however, when the heat treatment temperature was raised to 1 200 ℃, the hardness increased due to the change of metallographic organization and a significant increase inα₂ phase content.

Key words: TiAl alloy, shot peening, heat treatment, finite element simulation

CLC Number:

TG146.2

LIU Lihua, WEN Daosheng, WANG Shouren, NIU Jintao, SONG Qiang, YIN Ziqiang. Effect of heat treatment on the organization and properties of TiAl-based alloy shot-peened specimens[J].Shandong Science, 2023, 36(2): 59-68.

Figures/Tables 13

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	密度/ (kg·m^-3)	弹性模量/ GPa	泊松比
TiAl合金	4 050	110	0.31
丸粒	7 800	208	0.30

Effect of heat treatment on the organization and properties of TiAl-based alloy shot-peened specimens

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