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Effect of Heat Input on Microstructure Evolution and Mechanical Properties in the Weld Heat-Affected Zone of 9Cr-2W-VTa Reduced Activation Ferritic-Martensitic Steel for Fusion Reactor

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Abstract

The phase transformation and mechanical properties in the weld heat-affected zone (HAZ) of a reduced activation ferritic/martensitic steel were explored. The samples for HAZs were prepared using a Gleeble simulator at different heat inputs. The base steel consisted of tempered martensite and carbides through quenching and tempering treatment, whereas the HAZs consisted of martensite, δ-ferrite, and a small volume of autotempered martensite. The prior austenite grain size, lath width of martensite, and δ-ferrite fraction in the HAZs increased with increase in the heat input. The mechanical properties were evaluated using Vickers hardness and Charpy V-notch impact test. The Vickers hardness in the HAZs was higher than that in the base steel but did not change noticeably with increase in the heat input. The HAZs showed poor impact property due to the formation of martensite and δ-ferrite as compared to the base steel. In addition, the impact property of the HAZs deteriorated more with the increase in the heat input. Post weld heat treatment contributed to improve the impact property of the HAZs through the formation of tempered martensite, but the impact property of the HAZs remained lower than that of base steel.

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Acknowledgments

This research was supported by Nuclear Fusion Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning (NRF-2013M1A7A1A02043811).

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Authors and Affiliations

  1. Ferrous Alloy Department, Advanced Metallic Materials Division, Korea Institute of Materials Science, 797 Changwondaero, Seongsangu, Changwon, Gyeongnam, 642-831, Republic of Korea

    Joonoh Moon (Senior Researcher), Chang-Hoon Lee (Senior Researcher) & Tae-Ho Lee (Principal Researcher)

  2. DEMO Technology Division, National Fusion Research Institute, Daejeon, 305-806, Republic of Korea

    Hyoung Chan Kim (Principal Researcher)

Authors
  1. Joonoh Moon
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  2. Chang-Hoon Lee
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  3. Tae-Ho Lee
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  4. Hyoung Chan Kim
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Correspondence to Joonoh Moon.

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Manuscript submitted March 31, 2014.

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Moon, J., Lee, CH., Lee, TH. et al. Effect of Heat Input on Microstructure Evolution and Mechanical Properties in the Weld Heat-Affected Zone of 9Cr-2W-VTa Reduced Activation Ferritic-Martensitic Steel for Fusion Reactor. Metall Mater Trans A 46, 156–163 (2015). https://doi.org/10.1007/s11661-014-2623-4

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  • DOI: https://doi.org/10.1007/s11661-014-2623-4

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