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In this study, we designed a high-carbon bainite/martensite (B/M) steel with 2.64 GPa ultimate strength and over 10% elongation by only heat treatment processes to prevent intergranular fracture. Lower bainite was introduced prior to martensitic transformation to enhance the prior austenite grain boundaries (PAGBs). Blocky retained austenite (RA) was observed adjacent to the bainite sheaves along PAGBs. During tensile deformation, significant work hardening behaviour was observed, primarily due to the transformation-induced-plasticity (TRIP) effect within PAGs. A brittle-to-ductile transition was observed with increasing bainitic transformation time at the early stage. Overall, a low fraction of prior lower bainite can effectively enhance the ductility of the high-carbon martensite without sacrificing its ultrahigh strength.

権利情報:

• Creative Commons BY-NC Attribution-NonCommercial 4.0 International
  

キーワード: Bainite, Prior austenite grain boundary, Ultrahigh strength, High-carbon steel

刊行年月日: 2026-02-20

出版者: Elsevier BV

掲載誌:

• Materials Science and Engineering: A (ISSN: 09215093) vol. 957 149955

研究助成金:

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1016/j.msea.2026.149955

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更新時刻: 2026-02-26 08:30:05 +0900

MDRでの公開時刻: 2026-02-25 17:56:24 +0900