Effect of dilution on fatigue behaviour of welded joints produced by low-transformation-temperature fillers |
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| Authors: | Shipin Wu Dongpo Wang Zhi Zhang Chengning Li Xiuguo Liu Zhijin Zhou |
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| Affiliation: | 1. School of Materials Science and Engineering, Tianjin University, Tianjin, People’s Republic of China;2. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin, People’s Republic of China https://orcid.org/0000-0002-6046-2448;3. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin, People’s Republic of China;4. State Key Laboratory of Metal Material for Marine Equipment and Application, Anshan, People’s Republic of Chinahttps://orcid.org/0000-0002-4733-2366;5. School of Mechanical Engineering, Tianjin University, Tianjin, People’s Republic of Chinahttps://orcid.org/0000-0003-3703-1719;6. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin, People’s Republic of Chinahttps://orcid.org/0000-0002-5851-9679;7. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin, People’s Republic of Chinahttps://orcid.org/0000-0002-8653-3451;8. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin, People’s Republic of Chinahttps://orcid.org/0000-0003-0402-7510 |
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| Abstract: | ABSTRACTLow-transformation-temperature (LTT) fillers with various martensitic transformation start (Ms) temperatures were used to produce fillet welds. In comparison with conventional welds, the fatigue strength of the LTT fillet welds offers a significant improvement, with a minimum increase of 145%. Owing to the substantial dilution of base metal, the Cr and Ni alloying elements in the LTT weld metals decrease, resulting in an increase of the Ms temperatures. Therefore, the fillet welds produced using the LTT filler material with the lower Ms temperature (92°C) exhibit a larger compressive residual stress and higher fatigue strength. |
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| Keywords: | Low-transformation-temperature filler dilution fatigue strength residual stress martensitic transformation start temperature |
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![ORCID Icon]({"type":"image","src":"/templates/jsp/images/orcid.png"} "ORCID Icon")
https://orcid.org/0000-0002-6046-2448;3. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin, People’s Republic of China;4. State Key Laboratory of Metal Material for Marine Equipment and Application, Anshan, People’s Republic of China