Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 832, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2021.142441
Keywords
Ni-containing cryogenic steel; Microstructural heredity; As-rolled lath martensite; Quasi in-situ EBSD; Ultra-low temperature toughness
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Funding
- National Key R&D Program of China [2017YFB0305000]
- Fundamental Research Funds for Central Universities [N2124002-14]
- Natural Science Foundation Joint Fund Project of Liaoning Province [2019-KF-25-06]
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The microstructural heredity of as-rolled lath martensite with different prior austenite grain morphologies during inter-critical quenching has been studied. It is found that the refinement of final microstructure can be achieved by refining the as-rolled lath martensite through both refinement and elongation of prior austenite grains. The cryogenic toughness of Ni-containing cryogenic steels is significantly improved through the heredity effect of as-rolled lath martensitic refinement.
The microstructural heredity of as-rolled lath martensite with different prior austenite grain morphologies during inter-critical quenching has been studied by using a quasi in-situ EBSD technique in a 6.5%Ni-containing cryogenic steel, to reveal the effect of as-rolled microstructure on final microstructure and toughness at 77 K. It is found that the refinement of final microstructure can be achieved by refining the as-rolled lath martensite through both refinement and elongation of prior austenite grains, which is attributed to two aspects of heredity effect. On the one hand, the fine as-rolled martensitic structure in the interiors of prior austenite grains is inherited during inter-critical quenching. On the other hand, the refinement of as-rolled lath martensite promotes the formation of newly oriented grains along the prior austenite grain boundaries to further refine the microstructure. The cryogenic toughness of Ni-containing cryogenic steels is significantly improved through the heredity effect of as-rolled lath martensitic refinement.
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