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Evolution of Soft Zone in a Simulated 1.25Cr-0.5Mo Steel-Welded Joint During Post-weld Heat Treatment

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Abstract

In the present study, the effect of post-weld heat treatment on the soft zone of 1.25Cr-0.5Mo steel welded joint has been systematically studied. Outstanding features of the soft zone, including grain size, number density of carbides, volume fraction of carbides, and hardness distribution, are quantitatively analyzed by means of scanning electron microscopy and a microhardness testing. Results show that ferrite grain growth, carbide coarsening, and alloying element segregation are main factors accounting for hardness variations.

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Acknowledgments

The authors wish to thank the financial supports from the National Natural Science Foundation of China (Grant Nos. U20A20277, 51861130361, 51861145312, 51850410522, 52050410341, and 52011530180), Newton Advanced Fellowship by the Royal Society (Grant No. RP12G0414), Royal Academy of Engineering (Grant No. TSPC1070), Special Fund for Key Program of Science and Technology of Liaoning Province (Grant No. 2019JH1/10100014), The Fundamental Research Fund for Central Universities (Grant No. N2025025), Regional Innovation Joint Fund of Liaoning Province (Grant No. 2020-YKLH-39), Natural Science Foundation of Liaoning (Grant No. 2019KF0502), and Xingliao Talents Program (Grant Nos. XLYC1807024 and XLYC1802024). The authors also greatly appreciate the support from Jiangyin Xingcheng Special Steel Works Co., Ltd.

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Authors and Affiliations

  1. School of Metallurgy, Northeastern University, Shenyang, 110819, P.R. China

    Yang Shen, Zhengman Gu & Cong Wang

  2. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, 110819, P.R. China

    Cong Wang

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  1. Yang Shen
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Correspondence to Cong Wang.

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Manuscript submitted December 9, 2020, accepted February 25, 2021.

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Shen, Y., Gu, Z. & Wang, C. Evolution of Soft Zone in a Simulated 1.25Cr-0.5Mo Steel-Welded Joint During Post-weld Heat Treatment. Metall Mater Trans A 52, 1581–1587 (2021). https://doi.org/10.1007/s11661-021-06225-5

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