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Description:

This study aims to clarify the different boundary deformation mechanisms between medium-carbon lath martensite and high-carbon martensitic steels. In medium-carbon martensite, boundary deformation can trigger the activation of minor slips in surrounding blocks, leading to local strain partitioning. Compared with normal intra-block slips along in-lath-plane slip systems, these boundary-induced minor slips occur on planes aligned with the deformed boundaries. On the other hand, boundary deformation in high-carbon martensite is strictly confined along the boundaries, forming intense single-peak strain concentration bands. When the high-carbon martensite is tempered at 500°C, the boundary-induced minor deformation bands are observed again. This indicates that the activation of boundary-induced minor deformation primarily depends on the local critical resolve shear stress (CRSS) around the boundaries, instead of the carbon-induce microstructure variation. When primary boundary deformation occurs, high CRSS impedes the activation of surrounding minor deformation, leading to strain concentration along the boundaries. With low CRSS, minor deformation can be activated near the primary boundaries, leading to strain partitioning effect and improved overall ductility.

Rights:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

Keyword: Martensite, Plastic deformation, Boundary, Fracture behaviour

Date published: 2026-07-09

Publisher: Elsevier BV

Journal:

• Materials Science and Engineering: A (ISSN: 09215093) vol. 973 150709

Funding:

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1016/j.msea.2026.150709

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Updated at: 2026-07-15 09:36:32 +0900

Published on MDR: 2026-07-15 12:37:18 +0900