Fatigue properties of maraging steel after laser peening

Luca Petan (Author), Janez Grum (Author), Juan A. Porro (Author), Jose Luis Ocaña (Author), Roman Šturm (Author)

Abstract

Maraging steels are precipitation hardening steels used for highly loaded components in aeronautical and tooling industry. They are subjected to thermomechanical loads and wear, which significantly shorten their service life. Improvements of their surface mechanical properties to overcome such phenomena are of great interest. The purpose of our research was to investigate the influence of pulse density and spot size of a laser shock peening (LSP) process on the surface integrity with the fatigue resistance of X2NiCoMo18-9-5 maraging steel. Surface integrity was analyzed through roughness, residual stress, and microhardness measurements. The tests performed on resonant testing machine confirmed LSP is a promising process for increasing fatigue resistance of a component. Fatigue crack occurs, when the resonance frequency decreases. This moment, when the fatigue crack initiation phase ends and the fatigue crack propagation phase starts, was chosen as the moment of failure. We have proved LSP is a successful method in improving fatigue resistance of maraging steel by appropriate combination of laser spot size and pulse density tested in our research.

Keywords

mikrotrdota;zaostale napetosti;odpornost na resonančno utrujanje;hrapavost;microhardness;residual stresses;resonant fatigue resistance;roughness;

Data

Language:	English
Year of publishing:	2019
Typology:	1.01 - Original Scientific Article
Organization:	UL FS - Faculty of Mechanical Engineering
UDC:	620.1(045)
COBISS:	16961819
ISSN:	2075-4701
Views:	160
Downloads:	53
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	Slovenian
Secondary keywords:	mikrotrdota;zaostale napetosti;odpornost na resonančno utrujanje;hrapavost;
Type (COBISS):	Article
Pages:	f. 1-16
Volume:	ǂVol. ǂ9
Issue:	ǂiss. ǂ12
Chronology:	Nov. 2019
DOI:	10.3390/met9121271
ID:	13918248