Journal of Jilin University(Engineering and Technology Edition) ›› 2026, Vol. 56 ›› Issue (3): 670-680.doi: 10.13229/j.cnki.jdxbgxb.20240807

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Effect of heat treatment temperature on high temperature fatigue properties of TA15 repaired by laser deposition

Jia-hui CONG1,2(),Xu-yang ZHU1,2,Song ZHOU1,3(),Shou-long GAO1,2,Zhuo LIU1,2   

  1. 1.School of Mechanical and Electrical Engineering,Shenyang Aerospace University,Shenyang 110136,China
    2.Key Laboratory of Rapid Development & Manufacturing Technology for Aircraft(Shenyang Aerospace University),Ministry of Education,Shenyang 110136,China
    3.Shenyang Aircraft Design and Research Institute,Shenyang 110135,China
  • Received:2024-07-18 Online:2026-03-01 Published:2026-03-31
  • Contact: Song ZHOU E-mail:congjiahui2011@163.com;zhousong23@163.com

Abstract:

This paper investigates the high-temperature fatigue performance of TA15 titanium alloy laser-deposited repairs under different stress levels at 500 ℃ after heat treatment at various temperatures, analyzing the impact of microstructural evolution on fatigue life. The results show that when heat-treated at 900 ℃and 950 ℃, the content of the primary α phase in the base material decreases, the secondary α phase coarsens, and the microstructure in the heat-affected zone transitions from a transitional structure to a basket-weave structure. When the heat treatment temperature reaches 1 000 ℃, the α phase transforms into the high-temperature β phase, and recrystallization results in the formation of extremely fine β grains. Among the three heat treatment temperatures, the specimen treated at 1 000 ℃ exhibited the longest high-temperature fatigue life. Under high stress, the fatigue life of the specimens treated at 900 ℃ and 1 000 ℃ was comparable, while the specimen treated at 950 ℃ showed shorter high-temperature fatigue life under both high and low stress conditions compared to the other two groups. Fractographic analysis indicated that in the 1 000 ℃ specimen, fatigue cracks predominantly propagated through the α phase, consuming significant energy, which contributed to its longer high-temperature fatigue life compared to the other two heat treatment conditions.

Key words: TA15 titanium alloy, laser deposition repair, heat treatment, microstructure, high temperature fatigue property

CLC Number: 

  • TG405

Table 1

Chemical composition of TA15 spherical powder"

成分含量成分含量
Al6.62Si0.02
V2.13C0.01
Zr2.10N0.01
Mo1.67H0.003
O0.11Ti余量
Fe0.04

Fig.1

Schematic diagram of deposition repair processing"

Fig.2

Metallographic structure after heat treatment at different temperatures"

Fig.3

Metallographic transformation diagram after heat treatment at different temperatures"

Fig.4

Tensile properties at different heat treatment temperatures"

Fig.5

Bar chart of fatigue life comparison between high and low stress at high temperature"

Table 2

Statistical parameters of fatigue life at high temperature under 490 MPa stress"

试样类型对数寿命平均值/xˉ标准差/S子样变异系数/Cv中值疲劳寿命/N50试样个数/n
900 ℃4.809 0590.072 4420.015 06364 4266
950 ℃4.524 4020.062 4520.013 80333 4516
1 000 ℃5.105 1960.049 1830.009 634127 4086

Table 3

Statistical parameters of fatigue life at high temperature under 550MPa stress"

试样类型对数寿命平均值/xˉ标准差/S子样变异系数/Cv中值疲劳寿命/N50试样个数/n
900 ℃4.460 2250.063 2470.014 18028 8556
950 ℃4.213 4280.025 5610.006 06616 3476
1 000 ℃4.440 0900.085 6270.019 28527 5486

Fig.6

High stress and high temperature fatigue fracture initiation zone"

Fig.7

Low stress high temperature fatigue fracture initiation zone"

Fig.8

Extension zone of high stress and high temperature fatigue fracture"

Fig.9

Extension zone of low stress and high temperature fatigue fracture"

Fig.10

High stress and high temperature fatigue fracture transient zone"

Fig.11

Low stress high temperature fatigue fracture transient zone"

Fig.12

Microstructure near fracture initiation"

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