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자료유형
학술저널
저자정보
B. B. He (Southern University of Science and Technology) Q. W. Guan (Southern University of Science and Technology)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.28 No.10
발행연도
2022.10
수록면
2,330 - 2,339 (10page)
DOI
10.1007/s12540-021-01151-y

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초록· 키워드

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Dislocation engineering is a novel alloy design strategy to produce advanced high strength steels with both high strength andgood ductility, which can be accomplished through an ausforming process. The present work studies the effect of ausformingstrain on the evolution of lath martensite microstructure in low carbon steel by detailed transmission electron microscopyobservation. Ausforming strain determines the length of the martensite blocks and the substructure in the lath martensite.The large ausforming strain (20%–45%) reduces the martensite blocks and leads to the development of dislocation cellstructure, both of which are absent in the ausformed martensite with a small ausforming strain (5%–10%). The formationof the dislocation cell structure in the prior austenite grains after the large plastic deformation inhibits the propagation ofmartensite and thus reduces the length of martensite blocks. Irrespective of the ausforming strain, the plastic deformation ofaustenite grains does not lead to an obvious change of martensite lath width. The large ausforming strain slightly enhancesthe auto-tempering of martensite on the aspect of precipitates density. The coarse precipitates formed close to the lathboundaries after small ausforming strain of 5% is absent in the martensite with large ausforming strain (20%–45%), whichis ascribed to the presence of intensive dislocations generated by elevated ausforming strain can facilitate the pipe diffusionof carbon. The present finding serves as the microstructural basis for the application of the dislocation engineering conceptin the design of advanced high-strength steel with the martensite as the intrinsic component.

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