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Microstructure and Corrosion Resistance of Arc Additive Manufactured 316L Stainless Steel

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Abstract

The gas tungsten arc welding based additive manufacturing (GTAW-AM) was carried out by printing 316L austenitic stainless steel on carbon steel substrate with different arc currents (140, 160, 180 A). Microstructure and corrosion resistance of additive manufactured components were investigated. The results show that the microstructure of the GTAW-AM austenitic stainless steel is obviously changed by the arc current. With arc current increasing from 140 to 180 A, the austenite grains become coarse due to the effect of welding heat input. Meanwhile, the quantity of ferrites in the austenite matrix is decreased and the morphology transforms from lath to skeleton. Moreover, a phases are finally formed under the arc currents of 180 A owing to high welding heat input. Therefore, as the microstructure transform into coarse-grained austenites, low-quantity ferrites and new-generated a phases, the GTAW-AM austenitic stainless steel presents a significantly decrease in corrosion resistance. And the reduction of corrosion resistance is mainly due to the formation of a phase as a result from consuming the large amounts of Cr element from the matrix.

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Authors and Affiliations

  1. College of Mechanical and Electrical Engineering, Hohai University, Changzhou, 213022, China

    Ke Yang  (杨可), Qiuyu Wang, Yang Qu, Yongfeng Jiang & Yefeng Bao

  2. Nantong Ocean and Coastal Engineering Research Institute, Hohai University, Nantong, 226019, China

    Ke Yang  (杨可), Qiuyu Wang, Yang Qu, Yongfeng Jiang & Yefeng Bao

Authors
  1. Ke Yang  (杨可)
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  2. Qiuyu Wang
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  3. Yang Qu
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  4. Yongfeng Jiang
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  5. Yefeng Bao
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Corresponding author

Correspondence to Ke Yang  (杨可).

Additional information

Funded by National Key Research and Development Program of China (No. 2017YFE0100100), Fundamental Research Funds for the Central Universities (No.2018B59714) and Basic Research Program of Nantong (No. JC2019063)

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Yang, K., Wang, Q., Qu, Y. et al. Microstructure and Corrosion Resistance of Arc Additive Manufactured 316L Stainless Steel. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 35, 930–936 (2020). https://doi.org/10.1007/s11595-020-2339-9

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  • DOI: https://doi.org/10.1007/s11595-020-2339-9

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