期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2021.142046
关键词
Quenching-partitioning-tempering process; Hydrogen embrittlement; Morphology; Microalloying
类别
资金
- National Natural Science Foundation of China [51971148]
NbC carbide precipitation can effectively enhance the hydrogen embrittlement resistance and yield strength of high strength steel with the appropriate processing techniques. Retained austenite phases with different morphologies and locations exhibit varying hydrogen trap capabilities, while ferrite phase shows weaker hydrogen trapping ability.
Hydrogen embrittlement (HE) restricts the application of high strength steel in sustainable energy productions. As one type of efficient hydrogen trap sites, the NbC carbide precipitation is a superior approach to mitigate the HE susceptibility. The microstructure, mechanical properties and HE susceptibility were investigated in different high strength steels treated by quenching and partitioning (Q&P), quenching-partitioning-tempering (Q-P-T) and intercritical annealing quenching and partitioning (IAQP) processes in this study. The results show that the NbC particles can significantly improve the HE resistance of high strength steel treated by Q-P-T process. The NbC carbide precipitation has four different morphologies with varied sizes, which can effectively trap a large amount of diffusible hydrogen atoms. The retained austenite phases with different morphologies and locations have different hydrogen trap ability, but ferrite phase does not show strong hydrogen trap ability. Meanwhile, the NbC carbide precipitation can enhance the yield strength of steel effectively through precipitation strengthening, but has little effect on its ductility.
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