Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Effects of electroslag remelting process and Y on the inclusions and mechanical properties of the CLAM steel

  • Qiu, Guoxing (State Key Laboratory of Rolling and Automation, Northeastern University) ;
  • Zhan, Dongping (School of Metallurgy, Northeastern University) ;
  • Li, Changsheng (State Key Laboratory of Rolling and Automation, Northeastern University) ;
  • Yang, Yongkun (School of Metallurgy, Northeastern University) ;
  • Jiang, Zhouhua (School of Metallurgy, Northeastern University) ;
  • Zhang, Huishu (School of Metallurgy Engineering, Liaoning Institute of Science and Technology)
  • Received : 2019.07.11
  • Accepted : 2019.10.01
  • Published : 2020.04.25
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Abstract

Y-containing CLAM steels were melted via vacuum induction melting and electroslag remelting. In this study, the evolution, microstructure, and mechanical properties of the alloy inclusions (ESR-1 (0 wt.% Y), ESR-2 (0.016 wt.% Y) and ESR-3 (0.042 wt.% Y)) were investigated. Further, the number of inclusions in ESRed steel was observed to obviously decrease, and the distributions were more uniform. The fine Y-Al-O inclusions (1-2 ㎛) were the main inclusions in ESR-2. The addition of Y affected the prior austenite grain size (PAGZ), increasing the tensile strength at test temperature. Low ductile-brittle transition temperature (DBTT) was obtained because of the fine PAGZ and dispersive inclusions. For the ESRed CLAM steel with 0.016 wt.% Y, the yield strengths were 621 MPa at 20 ℃ and 354 MPa at 600 ℃ in air. Further, the uniform elongation and elongation of the ESR-2 alloy were 5.5% and 20.1% at 20 ℃, respectively. Meanwhile, the DBTT tested using full-size Charpy impact specimen (55 cm × 10 cm × 10 cm) was reduced to -83 ℃.

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References

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