Enhancement of Rolling Contact Wear and Fatigue Resistance of Wheel Steel by Laser Dispersed Treatment

Dong Fang Zeng; Lian Tao Lu

doi:10.4028/www.scientific.net/AMR.891-892.1797

Paper Titles

High Cycle Fatigue Behavior and Microstructural Characterization of 6013-T4 Aluminum Alloy Laser Welded Joints
p.1767

Low Cycle Fatigue Estimation Based on the Critical Distance Stress Theory
p.1773

Peculiarities of Elastic Waves Generated by Fatigue Tensile Fractures
p.1779

Study of Fatigue Crack Growth in Al-Mg-Si Alloys Using a Predictive Model under Positive and Negative Load Ratios
p.1785

Numerical Analysis of the Effect of Slip Ratio on the Fatigue Crack Initiation Life in Rolling Contact
p.1791

Enhancement of Rolling Contact Wear and Fatigue Resistance of Wheel Steel by Laser Dispersed Treatment
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Modelling Fatigue Crack Growth Rates in Aluminium Plates Reinforced by Bonded Fibre-Metal Laminates for Fatigue Life Extension
p.1803

Effect of Incipient Heat Damage on the Fatigue Properties of Aircraft Composites
p.1810

Influence of Secondary Ageing on Fatigue Crack Propagation of the AA7050 Aluminum Alloy
p.1816

HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 891-892Enhancement of Rolling Contact Wear and Fatigue...

Enhancement of Rolling Contact Wear and Fatigue Resistance of Wheel Steel by Laser Dispersed Treatment

Abstract:

Ferrite-pearlite steel is the most widely used material for railway wheel. However, such wheel steel can not meet the strict demands for rolling contact wear and fatigue resistance with the rising speed and weight of traffic. The aim of this paper is to improve the rolling contact wear and fatigue resistance of wheel steel by laser dispersed treatment. Such treatment creates isolated glazed regions on the surface layer of wheel steel, which are composed of fine martensite and retained autensite and have an avera0ge hardness of 762HV_0.3. Compared with the conventional laser surface treatment technologies, such as laser hardening, laser melting, or laser cladding, which have been applied for improving rolling contact wear and fatigue resistance of wheel/rail, the multiple overlapping laser tracks that cause the premature failure are avoided by laser dispersed treatment. The wear rate and rolling contact fatigue life of treated and untreated wheel steel were evaluated and compared by Amsler twin-disc testing machines in dry and lubricated condition, respectively. The test results show that laser dispersed treatment improves the rolling contact wear and fatigue resistance of wheel steel. The stable wear rate of the laser treated wheel steel is about 0.3 times that of untreated wheel disc and the average rolling contact life of treated wheel steel is about double that of the untreated steel. Further investigations show that the glazed regions suppress the plastic deformation of wheel steel. This inhibits the treated wheel steel from delamination wear and delays the formation of fatigue crack initiation.

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Periodical:

Advanced Materials Research (Volumes 891-892)

Pages:

1797-1802

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.891-892.1797

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Online since:

March 2014

Authors:

Dong Fang Zeng, Lian Tao Lu*

Keywords:

Laser Dispersed Treatment, Plastic Deformation, Rolling Contact Fatigue (RCF), Rolling Contact Wear

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* - Corresponding Author

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