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Microstructure and mechanical property of the fusion boundary region in an Alloy 182-low alloy steel dissimilar weld joint

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Abstract

Characterizations of the microstructure and mechanical property of the fusion boundary region of an Alloy 182-A533B low alloy steel (LAS) dissimilar weld joint were conducted. The existence of type-II boundary that parallels to the fusion boundary in the dilution zone (DZ) of Alloy 182 within a distance of about 50 μm was observed. The chemical composition transition was found in the narrow zone between the type-II and the fusion boundaries. Highest hardness was also found in this narrow zone in the fusion boundary region, implying a high residual strain level in the narrow zone. Lath martensite was observed in both sides of the type-II boundary in DZ, suggesting the localized enrichment of Fe and C adjacent to the type-II boundary due to the diffusion from LAS to DZ. Massive precipitations of carbides were observed on the type-II boundary but not on the fusion boundary. In addition, the orientation relationship at the fusion boundary between the lath martensite in the heat-affected zone in LAS and the austenite in the DZ was found to be Bain, K–S and N–W relationships.

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Acknowledgements

This study was supported by a program on “Mechanism of SCC in the Fusion Boundary Zone of Ni-base weld metal and Low Alloy Steel Dissimilar Weld Joints in High Temperature Oxygenated Water” organized by JSCE and sponsored by Japanese BWR utilities. The authors (J. Hou, J. Q. Wang, E.-H. Han, and W. Ke) would thank the Special Funds for the Major State Basic Research Projects G2006CB605000 in China.

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Authors and Affiliations

  1. Fracture and Reliability Research Institute, Graduate School of Engineering, Tohoku University, 6-6-01, Aramaki Aoba, Aoba-ku, Sendai, 980-8579, Japan

    J. Hou, Q. J. Peng, Y. Takeda, J. Kuniya & T. Shoji

  2. State Key of Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, 62 Wencui Road, 110016, Shenyang, China

    J. Hou, J. Q. Wang, E.-H. Han & W. Ke

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  1. J. Hou
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  2. Q. J. Peng
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  3. Y. Takeda
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  4. J. Kuniya
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  5. T. Shoji
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  6. J. Q. Wang
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  8. W. Ke
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Correspondence to Q. J. Peng.

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Hou, J., Peng, Q.J., Takeda, Y. et al. Microstructure and mechanical property of the fusion boundary region in an Alloy 182-low alloy steel dissimilar weld joint. J Mater Sci 45, 5332–5338 (2010). https://doi.org/10.1007/s10853-010-4581-6

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  • DOI: https://doi.org/10.1007/s10853-010-4581-6

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