INFLUENCE OF LASER SHOCK PEENING ON RESIDUAL STRESS AND FATIGUE LIFE OF STAINLESS STEELS

1,2 ŠPIRIT Zbyněk
Co-authors:
3 KAUFMAN Jan 1 STREJCIUS Josef 1 CHOCHOLOUŠEK Michal 1 KOTT Josef
Institutions:
1 Centrum vyzkumu Rez s.r.o., Morseova 1245/6, Plzen, Czech Republic, EU; zbynek.spirit@cvrez.cz
2 Department of Material Science and Technology, University of West Bohemia, Plzen, Czech Republic, EU
3 Hilase, Institute of Physics of the ASCR, v.v.i. Czech Republic
Conference:
28th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 22nd - 24th 2019
Proceedings:
Proceedings 28th International Conference on Metallurgy and Materials
Pages:
1163-1167
ISBN:
978-80-87294-92-5
ISSN:
2694-9296
Published:
4th November 2019
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
28 views / 9 downloads
Abstract

This paper shows influence of Laser Shock Peening (LSP) on Residual stress (RS) and Fatigue life of stainless steels. LSP is an innovative surface treatment technique for strengthening metallic materials. The principle of LSP is based on conversion of laser energy into a shock wave that results in material plastic deformation and redistribution of RS. The aim of the RS redistribution is to move the compressive RS to maximally stressed area in component. Suitable RS redistribution in component, can lead to increase of component fatigue life. The paper is focused on the RS change and fatigue life after LSP treatment. The tested material was austenitic stainless steel which is used in nuclear industry. The depth profile of RS was measured by X-ray diffraction (XRD) and fatigue life was examined through the three-point bend fatigue test.

Keywords: Laser Shock Peening, residual stress, fatigue life, stainless steel
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