Laser Surface Hardening

Yao, Jianhua; Zhang, Qunli; Liu, Rong; Wu, Guolong

doi:10.1007/978-981-16-8922-2_4

Cited by 3 publications

(1 citation statement)

References 16 publications

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“…Laser hardening is becoming a well-known manufacturing process in various industries, including the automotive and railway sectors. When comparing laser hardening technology with traditional hardening processes such as induction or flame hardening, complex shapes can be processed with a minimal heat-affected zone [9]. In addition, the interest in this process lies in the possibility of directly integrating a laser heat source on the production line without additional quenching media, as well as the ability to produce a variety of microstructures with very precise control between the soft core and the hard surface with compressive residual stresses [10,11].…”

Section: Introductionmentioning

confidence: 99%

Residual Stresses and the Microstructure of Modeled Laser-Hardened Railway Axle Seats under Fatigue

Čapek,

Trojan,

Kec

et al. 2024

Metals

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Railway wheels are usually attached to axles by press-fitting; therefore, the mechanical processes taking place during operation can result in failure, with fatal consequences for the axle seats. This manuscript describes the effect of laser hardening on the residual stress state, microstructural parameters (lattice defects—dislocations, crystallites, microstrains, etc.), and mechanical properties of laser-hardened EA1N steel railway axles under fatigue life conditions. Differences were found between ground, single-track, and multi-track hardened surfaces. Tensile residual stresses, low dislocation densities and hardnesses, and different microstructures (tempered cubic martensite) were found at the overlapped tracks and at the boundary of the heat-affected zone and bulk surface compared with the hardened zone. As a result, the surface treatment of axle seats by laser hardening improved the fatigue failure resistance compared with untreated seats. Optimal properties of the integrity of the axle seat surface were achieved, including fatigue resistance, which seems to be positively influenced mainly by sufficient hardness and the appropriate microstructure. The influence of the other investigated parameters was not evident, and was reduced by the presence of fretting corrosion and press-fitting.

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Section: Introductionmentioning

confidence: 99%