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Description:

We employed the high-resolution digital image correlation study to investigate the plastic deformation of low-carbon lath martensite. The strain localization bands were mainly categorized into two types: boundary slips and intra-block deformation. Misorientation angle and inclination angle with respect to loading direction primarily determines the slip activation at boundaries. The competitive relationship between the activation of in-lath-plane and out-of-lath-plane slip systems follows the Schmid effect. The in-lath-plane slip systems were only activated in blocks with high in-lath Schmid factor (SF) value. The out-of-lath-plane slip systems were activated only when its SF is much higher than the maximum in-lath SF, offsetting the effect of the higher critical resolved shear stress (CRSS) for in-lath-plane slip systems. Moreover, the block morphology also affects the slip activation behaviour: in-lath-plane slip systems in columnar blocks were preferentially activated due to both crystallographic dynamics and strain accommodation. In contrast, out-of-plane slip systems were only observed in equiaxed blocks where the boundary effect is weakened.

Rights:

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

Keyword: High-resolution digital image correlation, martensite, plastic deformation, microstructure, slip system

Date published: 2026-03-30

Publisher: Iron and Steel Institute of Japan

Journal:

• ISIJ International (ISSN: 09151559) vol. 66 issue. 4 ISIJINT-2025-325

Funding:

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

MDR DOI:

First published URL: https://doi.org/10.2355/isijinternational.isijint-2025-325

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Updated at: 2026-03-30 15:55:24 +0900

Published on MDR: 2026-03-31 12:24:54 +0900