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Microstructure and Low-Temperature Mechanical Properties of 304 Stainless Steel Joints by PAW + GTAW Combined Welding

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Abstract

The combined double-pass process of plasma arc welding (PAW) + gas tungsten arc welding (GTAW) was performed on 304 austenitic stainless steel with the thickness of 12 mm. Results indicated that two different morphologies of ferrite (e.g., lathy δ-ferrite and skeletal δ-ferrite) were formed within the austenite matrix in PAW weld metal (PAW-WM). GTAW weld metal (GTAW-WM) was mainly composed of fine austenite and skeletal δ-ferrite. In transition zone between PAW-WM and GTAW-WM, epitaxial growth contributed to cellular dendritic crystals transforming into columnar crystals. The tensile strength of joint is about 700 MPa. The impact toughness of WM varied from 281 J (20 °C) to 122 (−196 °C), while the impact toughness of heat-affected zone (HAZ) varied from 205 J (20 °C) to 112 J (−196 °C).

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Acknowledgments

This project is supported by National Natural Science Foundation of China (Grant No. 51575316) and the Natural Science Foundation of Shandong Province, China (Grant No. ZR2015EM040).

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Authors and Affiliations

  1. Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University, Jinan, 250061, People’s Republic of China

    Kun Liu, Yajiang Li & Juan Wang

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  1. Kun Liu
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  2. Yajiang Li
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  3. Juan Wang
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Correspondence to Kun Liu.

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Liu, K., Li, Y. & Wang, J. Microstructure and Low-Temperature Mechanical Properties of 304 Stainless Steel Joints by PAW + GTAW Combined Welding. J. of Materi Eng and Perform 25, 4561–4573 (2016). https://doi.org/10.1007/s11665-016-2288-9

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  • DOI: https://doi.org/10.1007/s11665-016-2288-9

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