Effects of pulsed laser surface remelting on microstructure, hardness and lead-bismuth corrosion behavior of a ferrite/martensitic steel

Hao Wang; Qian Yuan; Linjiang Chai; Ke Zhao; Ning Guo; Jun Xiao; Xing Yin; Bin Tang; Yuqiong Li; Shaoyu Qiu

doi:https://doi.org/10.1016/j.net.2021.12.030

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자료유형: 학술저널

저자정보: Hao Wang (Nuclear Power Institute of China) Qian Yuan (Chongqing University of Technology) Linjiang Chai (Chongqing University of Technology) Ke Zhao (Nuclear Power Institute of China) Ning Guo (Southwest University) Jun Xiao (Nuclear Power Institute of China) Xing Yin (Nuclear Power Institute of China) Bin Tang (Nuclear Power Institute of China) Yuqiong Li (Guangxi University) Shaoyu Qiu (Nuclear Power Institute of China)

저널정보: 한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제54권 제6호

발행연도: 2022.6

수록면: 1,972 - 1,981 (10page)

DOI: https://doi.org/10.1016/j.net.2021.12.030

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A typical ferritic/martensitic (F/M) steel sheet was subjected to pulsed laser surface remelting (LSR) andcorrosion test in lead-bismuth eutectic (LBE) at 550 C. There present two modification zones withdistinct microstructures in the LSRed specimen: (1) remelted zone (RZ) consisting of both bulk d-ferritegrains and martensitic plates and (2) heat-affected zone (HAZ) below the RZ, mainly composed ofmartensitic plates and high-density precipitates. Martensitic transformation occurs in both the RZ andthe HAZ with the Kurdjumov-Sachs and Nishiyama-Wassermann orientation relationships followedconcurrently, resulting in scattered orientations and specific misorientation characteristics. Hardnessesof the RZ and the HAZ are 364 ± 7 HV and 451 ± 15 HV, respectively, considerably higher than that of thematrix (267 ± 3 HV). In oxygen-saturated and oxygen-depleted LBE, thicknesses of oxide layers developed on both the as-received and the LSRed specimens increase with prolonging corrosion time (oxidelayers always thinner under the oxygen-depleted condition). The corrosion resistance of the LSRed F/Msteel in oxygen-saturated LBE is improved, which can be attributed to the grain-refinement acceleratedformation of dense FeeCr spinel. In oxygen-depleted LBE, the growth of oxide layers is very low withboth types of specimens showing similar corrosion resistance

#Ferritic/martensitic sheet #Laser surface remelting #Microstructural characteristics #Hardness #Lead-bismuth corrosion

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