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Acoustic emission detection of 316L stainless steel welded joints during intergranular corrosion

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Abstract

This study analyzes acoustic emission (AE) signals during the intergranular corrosion (IGC) process of 316L stainless steel welded joints under different welding currents in boiling nitric acid. IGC generates several AE signals with high AE activity. The AE technique could hardly distinguish IGC in stainless steel welded joints with different welding heat inputs. However, AE signals can effectively distinguish IGC characteristics in different corrosion stages. The IGC resistance of a heat-affected zone is lower than that of a weld zone. The initiation and rapid corrosion stages can be distinguished using AE results and microstructural analysis. Moreover, energy count rate and amplitude are considered to be ideal parameters for characterizing different IGC processes. Two types of signals are detected in the rapid corrosion stage. It can be concluded that grain boundary corrosion and grain separation are the AE sources of type 1 and type 2, respectively.

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Authors and Affiliations

  1. School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an, 710049, China

    Meng-yu Chai, Quan Duan, Wen-jie Bai & Zao-xiao Zhang

  2. Zhejiang Provincial Special Equipment Inspection Institute, Hangzhou, 310000, China

    Xu-meng Xie

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  1. Meng-yu Chai
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  2. Quan Duan
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  3. Wen-jie Bai
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  4. Zao-xiao Zhang
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  5. Xu-meng Xie
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Correspondence to Quan Duan.

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Chai, My., Duan, Q., Bai, Wj. et al. Acoustic emission detection of 316L stainless steel welded joints during intergranular corrosion. Int J Miner Metall Mater 22, 942–949 (2015). https://doi.org/10.1007/s12613-015-1153-4

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  • DOI: https://doi.org/10.1007/s12613-015-1153-4

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