Effect of Vacuum Heat Treatment Temperature on Microstructure and Properties of Titanium-steel Dissimilar Metal Laser Weld Joints

WANG Hongxiao; WANG Chunsheng; DENG Gang; ZHU Zongtao; CHEN Hui

doi:10.3969/j.issn.1674-6457.2025.09.025

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Journal of Netshape Forming Engineering ›› 2025, Vol. 17 ›› Issue (9) : 250-259. DOI: 10.3969/j.issn.1674-6457.2025.09.025

Effect of Vacuum Heat Treatment Temperature on Microstructure and Properties of Titanium-steel Dissimilar Metal Laser Weld Joints

WANG Hongxiao¹, WANG Chunsheng¹, DENG Gang¹, ZHU Zongtao^2,*, CHEN Hui²

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Abstract

The work aims to study the influence of heat treatment temperature on the residual stress, microstructure and properties of titanium-steel dissimilar metal laser joints after welding. Vacuum heat treatments were conducted on titanium-steel dissimilar metal laser-welded joints at 300, 600, and 900 ℃ for 3 h, with untreated joints at room temperature serving as the control group. The microstructure and mechanical properties at various temperature were analyzed using metallographic microscopy, scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), microhardness testing, and tensile testing. Results indicated that with increasing temperature, the diffusion rate of Fe atoms in the weld markedly surpassed that of Ti atoms. At elevated temperature, the weld region became more homogeneous, while hardness progressively decreased. However, this homogeneity came at the expense of reduced tensile strength. The joint treated at 300 ℃ achieved the maximum tensile strength of 128.2 MPa, with brittle fracture as the dominant failure mode. Within an optimal temperature range, heat treatment effectively reduced post-weld residual stress and enhanced joint performance. However, excessive temperature accelerated elemental diffusion in the weld, fostering the formation of brittle intermetallic compounds, which degraded joint performance. Consequently, the effects of heat treatment on titanium-steel dissimilar metal laser-welded joints are dual-faceted. The method of reducing the residual stress of joints and improving joint performance through heat treatment still requires more refined research.

Key words

vacuum heat treatment / tensile strength / hardness / brittle fracture / intermetallic compound / residual stress

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WANG Hongxiao, WANG Chunsheng, DENG Gang, ZHU Zongtao, CHEN Hui. Effect of Vacuum Heat Treatment Temperature on Microstructure and Properties of Titanium-steel Dissimilar Metal Laser Weld Joints[J]. Journal of Netshape Forming Engineering. 2025, 17(9): 250-259 https://doi.org/10.3969/j.issn.1674-6457.2025.09.025

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