Journal of Jilin University(Engineering and Technology Edition) ›› 2023, Vol. 53 ›› Issue (1): 105-110.doi: 10.13229/j.cnki.jdxbgxb20210589

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Effect of heat treatment on fatigue properties of TC4 titanium alloy by laser double beam welded joint

Li HUI1,2(),Jia-chen LU1,Song ZHOU1(),Jin-lan AN2,Guan-yan ZHOU3,Xiao-peng LIU1   

  1. 1.School of Mechanical and Electrical Engineering，Shenyang Aerospace University，Shenyang 110136，China
    2.National Defense Key Discipline Laboratory of Aerospace Manufacturing Process Digitization，Shenyang Aerospace University，Shenyang 110136，China
    3.Shenyang Aircraft Design and Research Institute，Aviation Industry Corporation of China，Shenyang 110136，China
  • Received:2021-06-29 Online:2023-01-01 Published:2023-07-23
  • Contact: Song ZHOU E-mail:syhuili@126.com;zhousong23@163.com

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Abstract:

Based on the problem of fatigue fracture of the T joint of the typical parts of the aircraft metal integral air inlet due to the resistance of air circulation during the service process， the TC4 titanium alloy was heat treated after the T joint welding with the laser double beam welding technology， and different heat treatments were studied. The effects of different heat treatment methods on microstructure， fatigue properties and fracture mechanism of welded joints were investigated. The results show that the fatigue life of the specimens with double annealing treatment is 1.89 times that of the specimens without heat treatment， and the fatigue life of the specimens with one annealing treatment is 1.43 times that of the specimens without heat treatment. The fatigue fracture analysis shows that， compared with the specimens without heat treatment， the fatigue stripe spacing in the stable fatigue crack growth zone of the specimens after heat treatment decreases， indicating that the fatigue crack growth rate decreases， so the fatigue life increases. After heat treatment， acicular α' martensite precipitates in the microstructure of the net basket， which increases the resistance to crack initiation and propagation and promotes the fatigue life of the specimen.

Key words: TC4 titanium alloy, fatigue fracture, heat treatment, laser double beam welding, fracture mechanism

CLC Number: 

  • TG407

Fig.1

Shape and dimensions of laser double beam welding specimen"

Table 1

Statistical results of low cycle fatigue life"

类型疲劳寿命/N

中值疲劳

寿命/N50

对数寿命

平均值/xˉ

标准差/S子样变异系数/Cv
未经热处理试件69 383 35 997 100 843 65 923 54 467 56 67960 9484.785 00.146 8560.030 691
一次退火试件91 672 69 108 102 250 61 432 83 254 130 99286 9124.939 10.117 6170.023 813
双重退火试件97 815 84 284 109 327 93 487 141 708 198 937115 5115.076 50.138 9830.027 453

Fig.2

Fatigue failure fracture morphology"

Fig.3

Microstructure morphology of fusion zone in welded joint"

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