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Dendrite evolution of delta (δ) ferrite and precipitation behavior of sigma (σ) phase during multipass dissimilar stainless steels welding

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Abstract

The purpose of this study is to discuss the development of dendrite δ-ferrite and the precipitation behavior of σ phase in the overlapping heat-affected zones, or the fusion zones, during the multipass dissimilar stainless steels welding process. The color metallographic and color separation techniques were used to clearly identify the δ, σ, and γ phases. The experimental results indicated that the grain refinement was very obvious in the second and third pass fusion zones (304-1 and 304-2) when the welding pass was increased from 1 to 3. This refining phenomenon was attributed to the higher cooling rate and the degree of supercooling. The δ phase precipitated in the secondary and the tertiary dendrite arms of the δ-ferrite and it was able to grow on the dendrite arms along the [1\( \bar 1 \)1] crystallographic in a 45° angle. The σ phase was also able to form stably after the phase decomposition of δ-ferrite into globular and lacy morphologies.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, National Chung Hsing University, No. 250, Kuo-Kuang Rd., Taichung, 402, Taiwan

    Chih-Chun Hsieh, Chia-Ming Chang & Weite Wu

  2. Department of Ferrous Metallurgy, RWTH Aachen University, Intzestrasse 1, D-52072, Aachen, Germany

    Chih-Chun Hsieh & Xiaofei Guo

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  1. Chih-Chun Hsieh
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  2. Xiaofei Guo
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  3. Chia-Ming Chang
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  4. Weite Wu
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Correspondence to Weite Wu.

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Hsieh, CC., Guo, X., Chang, CM. et al. Dendrite evolution of delta (δ) ferrite and precipitation behavior of sigma (σ) phase during multipass dissimilar stainless steels welding. Met. Mater. Int. 16, 349–356 (2010). https://doi.org/10.1007/s12540-010-0602-x

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