Journal of Jilin University(Engineering and Technology Edition) ›› 2025, Vol. 55 ›› Issue (6): 1931-1939.doi: 10.13229/j.cnki.jdxbgxb.20231006

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Microstructure of titanium alloy heat affected zone repaired by laser deposition and properties of subsequent heat treatment

Jin-lan AN1(),Lan-bin WANG2,Song ZHOU2,3(),Yan-qing HUANG1   

  1. 1.Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process，Shenyang Aerospace University，Shenyang 110136，China
    2.School of Mechatronics Engineering，Shenyang Aerospace University，Shenyang 110136，China
    3.Shenyang Aircraft Design and Research Institute，Shenyang 110035，China
  • Received:2023-09-16 Online:2025-06-01 Published:2025-07-23
  • Contact: Song ZHOU E-mail:845423087@qq.com;zhousong23@163.com

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Abstract:

In view of the characteristics of titanium alloy parts with good performance but low material utilization rate and damage in harsh environments， laser deposition repair technology was used to quickly repair them. The effects of different heat treatments on the microstructure and mechanical properties of titanium alloy（Ti-6.5Al-2Zr-1Mo-1V） repaired by laser deposition were studied. The results show that the forging zone has a bi-modal microstructure， the laser repair zone has a basketweave microstructure， the Ghost α phase was formed in the bottom heat-affected zone， and a large number of massive β phases were formed in the top heat-affected zone. Tensile tests show that its mechanical properties were generally high strength and low plasticity， and were all ductile fractures. The heat treatment method of 920 ℃/1 h achieves a good match between strengthand plasticity. Through Digital image processing technology analysis， it was found that the laser repair zone determines the overall performance of the entire sample， and the thinner lamellar α and the short rod-shaped α phase precipitated in the β matrix help to improve the mechanical properties.

Key words: laser deposition repair technology, mechanical properties, titanium alloys, digital image processing technology

CLC Number: 

  • TG405

Fig.1

Test scheme"

Table 1

Process parameters of laser deposition repair"

参数数值
激光功率/W3 000±200
扫描间距/mm3
扫描速度/（mm·min-1）1 000±100
送粉速度/（rad·min-1）2~2.8
分层厚度/mm0.9

Fig.2

Microstructure of the sample without heat treatment"

Fig.3

Macroscopic structure of TA15 titanium alloy repaired by laser deposition"

Figure.4

Microstructure of heat affected zone of TA15 titanium alloy repaired by laser deposition"

Fig.5

Microstructure of TA15 titanium alloy repaired by laser deposition"

Fig.6

Microhardness and α phase content of TA15 titanium alloy repaired by laser deposition"

Fig.7

Different tensile properties of TA15 titanium alloy repaired by laser deposition after heat treatment"

Fig.8

Strain evolution and axial displacement-time curve analysis during tensile process"

Fig.9

Tensile fracture morphology"

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