Influence of a Pronounced Pre-Deformation on the Attachment of Melt Droplets and the Fatigue Behavior of Laser-Cut AISI 304

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • André T. Zeuner - , Chair of Mechanics of Materials and Failure Analysis, TUD Dresden University of Technology (Author)
  • Thomas Wanski - , Chair of Mechanics of Materials and Failure Analysis, TUD Dresden University of Technology (Author)
  • Sebastian Schettler - , Fraunhofer Institute for Material and Beam Technology (Author)
  • Jonas Fell - , Saarland University (Author)
  • Andreas Wetzig - , Fraunhofer Institute for Material and Beam Technology (Author)
  • Robert Kühne - , Fraunhofer Institute for Material and Beam Technology (Author)
  • Sarah C.L. Fischer - , Fraunhofer Institute for Nondestructive Testing (Author)
  • Martina Zimmermann - , Chair of Mechanics of Materials and Failure Analysis, TUD Dresden University of Technology, Fraunhofer Institute for Material and Beam Technology (Author)

Abstract

Laser cutting is a suitable manufacturing method for generating complex geometries for sheet metal components. However, their cyclic load capacity is reduced compared to, for example, milled components. This is due to the influence of the laser-cut edge, whose characteristic features act as crack initiation sites, especially resolidified material in the form of burr and melt droplets. Since sheet metal components are often formed into their final geometry after cutting, another important factor influencing fatigue behavior is the effect of the forming process on the laser-cut edge. In particular, the effect of high degrees of deformation has not yet been researched in detail. Accordingly, sheets of AISI 304 were processed by laser cutting and pre-deformed. In the process, α’-martensite content was set to be comparable despite different degrees of deformation. It was found that deformation to high elongations caused a large part of the melt adhesions to fall off, but those still attaching were partially detached and thus formed an initial notch for crack initiation. This significantly lowered the fatigue strength.

Details

Original languageEnglish
Article number201
Pages (from-to)1-12
Number of pages12
JournalMetals
Volume13
Issue number2
Publication statusPublished - 19 Jan 2023
Peer-reviewedYes

Keywords

Keywords

  • detachment, fatigue behavior, laser cutting, melt adhesion, micro-computed tomography analysis, notch, resolidified material