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

J.P.M. Hoefnagels (Corresponding author), Chaowei Du, C. Cem Tasan

Research output: Contribution to journalArticleAcademicpeer-review

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.

LanguageEnglish
Pages79-85
Number of pages7
JournalScripta Materialia
Volume177
DOIs
StatePublished - 1 Mar 2020

Fingerprint

Steel
Toughening
steels
Lasers
Crack propagation
surface layers
blanking
damage
lasers
laser cutting
Nanoindentation
toughness
nanoindentation
martensite
Martensite
Toughness
cracks
microstructure
Microstructure
propagation

Keywords

  • Blanking
  • Cut-edge failure
  • In-situ testing
  • Laser cutting
  • Micromechanics

Cite this

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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.",
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Laser-induced toughening inhibits cut-edge failure in multi-phase steel. / Hoefnagels, J.P.M. (Corresponding author); Du, Chaowei; Cem Tasan, C.

In: Scripta Materialia, Vol. 177, 01.03.2020, p. 79-85.

Research output: Contribution to journalArticleAcademicpeer-review

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AU - Du,Chaowei

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