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

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.

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 Creators:
Hoefnagels, Johan P.M.1, Author              
Du, Chaowei2, Author              
Tasan, Cemal Cem3, Author              
Affiliations:
1Eindhoven University of Technology, Dep. of Mech. Eng., P.O. Box 513, 5600MB Eindhoven, The Netherlands, ou_persistent22              
2Nano-/ Micromechanics of Materials, Structure and Nano-/ Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863401              
3Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA, ou_persistent22              

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Free keywords: Crack propagation; Dual phase steel; Laser beam cutting; Laser beams; Micromechanics; Steel research, Blanking; Cut edge; In-situ testing; Laser cutting; Martensitic surfaces; Micro-structural damages; Microscopic Digital Images; Microstructural deformation, Advanced high strength Steel
 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.

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Language(s): eng - English
 Dates: 2020-03-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.scriptamat.2019.09.022
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Title: Scripta Materialia
  Abbreviation : Scripta Mater.
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier B. V.
Pages: - Volume / Issue: 177 Sequence Number: - Start / End Page: 79 - 85 Identifier: ISSN: 1359-6462
CoNE: https://pure.mpg.de/cone/journals/resource/954926243506