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Laser-induced toughening inhibits cut-edge failure in multi-phase steel

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Du,  Chaowei
Nano-/ Micromechanics of Materials, Structure and Nano-/ Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Citation

Hoefnagels, J. P., Du, C., & Tasan, C. C. (2020). Laser-induced toughening inhibits cut-edge failure in multi-phase steel. Scripta Materialia, 177, 79-85. doi:10.1016/j.scriptamat.2019.09.022.


Cite as: http://hdl.handle.net/21.11116/0000-0009-691B-4
Abstract
The as-cut microstructures and the subsequent microstructural deformation characteristics of dual-phase steel specimens were analyzed using in-situ biaxial Marciniak tests, microscopic digital-image-correlation and nano-indentation, for two industrially relevant cutting processes: laser cutting and blanking. Interestingly, the strain-to-failure of the former is almost twice that of the latter, even though microstructural damage initiates twice as early (at 8 strain) in the ∼60 µm-thick, fully-martensitic surface layer of the laser-cut affected zone. However, its ∼145 µm-thick, tempered-martensite sub-surface layer provides the toughness to delay micro-damage propagation, arrest the crack growth, and ultimately provide the high strain-to-failure. These observations reveal guidelines to avoid cut-edge failure. © 2019 Acta Materialia Inc.