Fatigue life enhancement of additive manufactured 316l stainless steel by LSP using a DPSS laser system

Sanin Zulić, Danijela Rostohar, Jan Kaufman, Sunil Pathak, Jaromir Kopeček, Marek Böhm, Jan Brajer, Tomáš Mocek

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)
23 Downloads (Pure)

Abstract

Present work aims to study the fatigue life behaviour of additively manufactured (AM) stainless steel 316L in a laser shock peening (LSP) process. The fatigue behaviour of as-built samples and LSPeened sample were studied on the AM samples. A new diode-pumped laser system was utilized as an instrument to perform LSP operations. LSP operation was performed under two different sacrificial layers of different materials i.e. vinyl tape and aluminium tape. The other essential LSP parameters, namely energy, pulse width, spot size, overlap, and number of layers were kept constant based on the previous experimental findings. The characterization was done for analyzing the residual stresses using a hole drilling process, and a 4-point bending machine. A considerable improvement in compressive residual stress and fatigue life was observed in the LSPeened samples. Such improvements in residual stresses and fatigue life may pave a road to establishing diode-pumped lasers for LSP applications.

Original languageEnglish
Pages (from-to)183-190
Number of pages8
JournalSurface Engineering
Volume38
Issue number2
DOIs
Publication statusPublished - 13 Apr 2022
Externally publishedYes

Bibliographical note

© 2022 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis GroupThis is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited, and is not altered, transformed, orbuilt upon in any way

Funder

This work was supported by European Union’s Horizon 2020 research and innovation programme [grant no. 739573]; European Structural and Investment Fund and the Czech Ministry of Education, Youth and Sports (Project International mobility MSCA-IF IV FZU—CZ.02.2.69/0.0/0.0/20_079/0017754); European Structural and Investing Funds, Operational Programme Research, Development and Education [grant no. CZ.02.1.01/0.0/0.0/15_006/ 0000674].

Keywords

  • Laser shock peening
  • residual stress
  • fatigue
  • DPSS
  • additive manufacturing;
  • SLM
  • SEM
  • EBSD

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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