Fatigue Properties of Maraging Steel after Laser Peening

被引：11

作者：

Petan, Luca ^{[1
]}

Grum, Janez ^{[1
]}

Antonio Porro, Juan ^{[2
]}

Luis Ocana, Jose ^{[2
]}

Sturm, Roman ^{[1
]}

机构：

[1] Univ Ljubljana, Fac Mech Engn, Ljubljana 1000, Slovenia

[2] Univ Politecn Madrid, UPM Laser Ctr, Madrid 28031, Spain

来源：

METALS | 2019年 / 9卷 / 12期

关键词：

microhardness; residual stresses; resonant fatigue resistance; roughness; HIGH-CYCLE FATIGUE; SURFACE INTEGRITY; SHOCK; PROPAGATION; TOOL;

D O I：

10.3390/met9121271

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页数：17

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