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Evaluation of solidification cracking susceptibility in laser welds for type 316FR stainless steel

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Abstract

Laser beam welding (LBW) transverse-Varestraint tests were performed to quantitatively evaluate the solidification cracking susceptibility of laser welds of type 316FR stainless steel with two kinds of filler metal (316FR-A and 316FR-B). This found that as the welding speed increased from 1.67 to 40.0 mm/s, the increase in the solidification brittle temperature range (BTR) was greater in the case of 316FR-B (from 14 to 40 K) than 316FR-A (from 37 to 46 K). Based on theoretical calculations for the temperature range over which both solid and liquid phases coexist, for which Kurz-Giovanola-Trivedi and solidification segregation models were used, the greater increase in BTR with 316FR-B was determined to be due to a larger decrease in δ-ferrite during welding solidification than with 316FR-A. This, in turn, greatly increases the segregation of impurities, which is responsible for the greater temperature range of solid/liquid coexistence when using 316FR-B.

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Acknowledgments

The present study includes results from a “Core R&D program for commercialisation of the fast breeder reactor by utilizing Monju” entrusted to the University of Fukui by the Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT).

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Authors and Affiliations

  1. Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita-shi, Osaka, 565-0871, Japan

    Eun-Joon Chun & Kazuyoshi Saida

  2. Department of the Application of Nuclear Technology, Fukui University of Technology, Gakuen 3-6-1, Fukui-shi, Fukui, 910-8505, Japan

    Kazutoshi Nishimoto

Authors
  1. Eun-Joon Chun
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  2. Kazutoshi Nishimoto
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  3. Kazuyoshi Saida
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Correspondence to Eun-Joon Chun.

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Recommended for publication by Commission IX - Behaviour of Metals Subjected to Welding

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Chun, EJ., Nishimoto, K. & Saida, K. Evaluation of solidification cracking susceptibility in laser welds for type 316FR stainless steel. Weld World 60, 217–231 (2016). https://doi.org/10.1007/s40194-016-0293-0

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  • DOI: https://doi.org/10.1007/s40194-016-0293-0

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