Influence of welding process parameters on the microstructure and shear strength of TA15/304SS vacuum diffusion welded joints

YU Xi; LI Qi; CHANG Ronghui; QIN Binhao; ZHANG Yupeng; YIN Limeng; WANG Haiyan

doi:10.12073/j.hjxb.20230630001

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2024 > 45(5): 64-73. > DOI: 10.12073/j.hjxb.20230630001

YU Xi, LI Qi, CHANG Ronghui, QIN Binhao, ZHANG Yupeng, YIN Limeng, WANG Haiyan. Influence of welding process parameters on the microstructure and shear strength of TA15/304SS vacuum diffusion welded joints[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2024, 45(5): 64-73. DOI: 10.12073/j.hjxb.20230630001

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Influence of welding process parameters on the microstructure and shear strength of TA15/304SS vacuum diffusion welded joints

1.
Guangdong Provincial Key Laboratory of Modern Welding Technology, China-Ukraine Institute of welding Guangdong Academy of Sciences, Guangzhou, 510650, China
2.
School of Metallurgy and Materials Engineering, Chongqing University of Science and Technology, Chongqing, 401331, China
3.
Shenyang Aircraft Industry (Group) Co, Ltd, Shenyang, 110034, China

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Received Date: June 29, 2023
Available Online: March 08, 2024

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Abstract

Abstract

A study was conducted on the dissimilar metal connection and joint between TA15 titanium alloy and 304 stainless steel. The experimental results show that at welding temperatures of 850-950 ℃, the diffusion zone of the joint (β-Ti) District and (α + β) Ti biphasic region increases with the increase of temperature, element diffusion is more complete, joint pores gradually decrease, and an increasing number of layered products are observed. The layered products are mainly interface layers composed of intermetallic compounds, namely σ-Fe (1st layer), FeTi + Fe₂Ti (2nd layer), FeTi + β-Ti (3rd layer) and β-Ti (4th layer). When the welding temperature is 900 ℃, the welded joint reaches its maximum shear strength of 108MPa. As the welding time increases, the microstructure and composition of the welded joint are similar to those of the welding temperature parameter joint, but the influence of welding time on the shear strength of the joint is relatively small. When the welding time is 80 minutes, the shear strength reaches its maximum value, and the fracture surface exhibits a brittle ductile mixed fracture feature dominated by toughness.
- TA15/304SS,
- welding of dissimilar metals,
- vacuum diffusion welding,
- process parameters,
- microscpic organization,
- mechanical property

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References (24)

References

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Influence of welding process parameters on the microstructure and shear strength of TA15/304SS vacuum diffusion welded joints