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Precipitation behavior of σ phase in fusion zone of dissimilar stainless steel welds during multi-pass GTAW process

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Abstract

The purpose of this study is to investigate the precipitation characteristics of σ phase in the fusion zone of stainless steel welds at various welding passes during a tungsten are welding (GTAW) process. The morphology, quantity, and chemical composition of the δ-ferrite and σ phase were analyzed using optical microscopy (OM), a ferritscope (FS), a X-ray diffractometer (XRD), scanning electron microscopy (SEM), an electron probe micro-analyzer (EPMA), and a wavelength dispersive spectrometer (WDS), respectively. Massive δ-ferrite was observed in the fusion zone of the first pass welds during welding of dissimilar stainless steels. The σ phase precipitated at the inner δ-ferrite particles and decreased δ-ferrite content during the third pass welding. The σ and δ phases can be stabilized by Si element, which promoted the phase transformation of σ→ϱ+λ2 in the fusion zone of the third pass welds. It was found that the σ phase was a Fe−Cr−Si intermetallic compound found in the fusion zone of the third pass welds during multi-pass welding.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, National Chung Hsing University, 250 Kuo-Kuang Rd., 402, Taichung, Taiwan, R.O.C.

    Chih-Chun Hsieh, Ming-Che Chen & Weite Wu

  2. Electronics and Optoelectronics Research Laboratory, Industrial Technology Research Institute, 195 Section 4, Chung-Hsing Road, Chutung, 31040, Hsinchu, Taiwan, R.O.C.

    Tao-Chih Chang

  3. Department of Materials Science and Engineering, I-Shou University, 1, Section 1, Hsueh-Cheng Rd., Ta-Hsu Hsiang, 840, Kaohsiung, Taiwan, R.O.C.

    Dong-Yih Lin

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  1. Chih-Chun Hsieh
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  2. Tao-Chih Chang
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  5. Weite Wu
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Correspondence to Weite Wu.

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Hsieh, CC., Chang, TC., Lin, DY. et al. Precipitation behavior of σ phase in fusion zone of dissimilar stainless steel welds during multi-pass GTAW process. Met. Mater. Int. 13, 411–416 (2007). https://doi.org/10.1007/BF03027877

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