Abstract
The soft zone of Grade 91 steel has been precisely identified and systematically characterized subjected to designed postweld heat treatment. It has been demonstrated that the formation of fine fresh martensites and ensuing rapid degradation are primary factors accounting for excessive hardness reduction in the soft zone. Moreover, it has been documented that prolonging postweld heat treatment duration could significantly enhance the soft zone width as dominating microstructure morphs into equiaxed ferrites and coarse precipitates.
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Acknowledgments
The authors wish to thank the financial support from the National Key Research and Development Program of China (Grant No. 2022YFE0123300), the National Natural Science Foundation of China (Grant Nos. U20A20277 and 52150610494), Spring Sunshine Plan (Chunhui) Research Project of Ministry of Education of China (Grant No. HZKY20220437). Yang Shen acknowledges the financial support from Jiangxi Provincial Natural Science Foundation (Grant No. 20232BAB214054), Science and Technology Research Project of Jiangxi Education Department (Grant No. GJJ2201117), and Global Talents Recruitment Program (Double Thousand Plan) endowed by Jiangxi Provincial Government.
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Gu, Z., Shen, Y., Zhong, M. et al. Formation Mechanism and Evolution Behavior of the Soft Zone in Grade 91 Steel Weldment During Postweld Heat Treatment. Metall Mater Trans A 55, 31–37 (2024). https://doi.org/10.1007/s11661-023-07236-0
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DOI: https://doi.org/10.1007/s11661-023-07236-0