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Effect of Chemical Composition on Susceptibility to Weld Solidification Cracking in Austenitic Weld Metal

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Abstract

The influence of the chemical composition, especially the niobium content, chromium equivalent Creq, and nickel equivalent Nieq, on the weld solidification cracking susceptibility in the austenite single-phase region in the Schaeffler diagram was investigated. Specimens were fabricated using the hot-wire laser welding process with widely different compositions of Creq, Nieq, and niobium in the region. The distributions of the susceptibility, such as the crack length and brittle temperature range (BTR), in the Schaeffler diagram revealed a region with high susceptibility to solidification cracking. Addition of niobium enhanced the susceptibility and changed the distribution of the susceptibility in the diagram. The BTR distribution was in good agreement with the distribution of the temperature range of solidification (ΔT) calculated by solidification simulation based on Scheil model. ΔT increased with increasing content of alloying elements such as niobium. The distribution of ΔT was dependent on the type of alloying element owing to the change of the partitioning behavior. Thus, the solidification cracking susceptibility in the austenite single-phase region depends on whether the alloy contains elements. The distribution of the susceptibility in the region is controlled by the change in ΔT and the segregation behavior of niobium with the chemical composition.

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Acknowledgment

This work was supported by JSPS KAKENHI Grant Number 15K18223 and a grant of Japan welding engineering society.

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Authors and Affiliations

  1. Joining and Welding Research Institute, Osaka University, Osaka, 567-0047, Japan

    Kota Kadoi

  2. Graduate School of Engineering, Hiroshima University, Hiroshima, 739-8527, Japan

    Kenji Shinozaki

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  1. Kota Kadoi
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  2. Kenji Shinozaki
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Correspondence to Kota Kadoi.

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Manuscript submitted April 3, 2017.

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Kadoi, K., Shinozaki, K. Effect of Chemical Composition on Susceptibility to Weld Solidification Cracking in Austenitic Weld Metal. Metall Mater Trans A 48, 5860–5869 (2017). https://doi.org/10.1007/s11661-017-4340-2

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  • DOI: https://doi.org/10.1007/s11661-017-4340-2

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