Quantitative investigation on deep hydrogen trapping in tempered martensitic steel

JOURNAL OF ALLOYS AND COMPOUNDS

卷:854

Article

Shi, Rongjian^1,2  Chen, Lin^1,2  Wang, Zidong³  Yang, Xu-Sheng⁴  Qiao, Lijie^1,2  Pang, Xiaolu^1,3 

[1] Univ Sci & Technol Beijing, Beijing Adv Innovat Ctr Mat Genome Engn, Beijing 100083, Peoples R China

[2] Univ Sci & Technol Beijing, Corros & Protect Ctr, Beijing 100083, Peoples R China

[3] Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China

[4] Hong Kong Polytech Univ, Adv Mfg Technol Res Ctr, Dept Ind & Syst Engn, Hung Hom,Kowloon, Hong Kong, Peoples R China

关键词: Hydrogen embrittlement;    Martensitic steels;    Hydrogen traps;    Precipitation;    Transmission electron microscopy;   

DOI  :  10.1016/j.jallcom.2020.157218

来源: Elsevier

【 摘 要 】

In this work, the correlation between different microstructural components and hydrogen trapping with high density in tempered niobium carbide (NbC)-precipitated martensitic steel was quantitatively investigated using a combination of electrochemical hydrogen permeation experiments and thermal desorption spectroscopy. The martensite lath and a high density of dislocations, which constitute the reversible hydrogen trapping sites, with a density of 2.24 x 10(20) cm(-3) in Fe-0.05C-1.10Mn-4.50Ni-0.50Cr-0.50Mo-0.05Nb wt.% martensitic steel. The dislocation with high density could disperse the hydrogen distribution. Furthermore, the uniformly distributed NbC nanoprecipitates, the high-angle grain boundaries, and the grain-boundary precipitates were found to act as irreversible hydrogen traps, with a density of 1.00 x 10(20) cm(-3). These deep hydrogen trapping sites could not only trap hydrogen irreversibly, but also can inhibit the accumulation of hydrogen. The interpretation of hydrogen trapping is significant to enhance the hydrogen embrittlement resistance of high-strength martensitic steels. (C) 2020 Elsevier B.V. All rights reserved.

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