Laser cladding for railway repair: influence of depositing materials and heat treatment on microstructural characteristics
Loading...
Date
2017
Journal Title
Journal ISSN
Volume Title
Publisher
American Society of Civil Engineers (ASCE)
Abstract
The contact between train wheels and rail tracks is known to induce material degradation in
the form of wear, and rolling contact fatigue in the railhead. Laser cladding, a state of the art
surface engineering technique, is a promising solution to repair damaged railheads so as to
alleviate the rates of degradation and extend the component longevity. In this paper, effects of
cladding material and heat treatment on microstructures of laser treated rails is presented. Laser
cladding of premium hypereutectoid rail, four different depositing materials, and different heat
treatments were investigated. For the preheating length of 400 mm, equal to the cladding length,
the formation of martensite in heat affected zone (HAZ) was not hindered by the application of
preheating to 350 °C on the rail-longitudinally deposited railhead of the four materials.
Consequentially, cracking in the clad and HAZ was expected. An uncracked microstructure with
excellent microstructural consistency across the entire rail-longitudinally deposited railhead and
its HAZ was established using a heat treatment combination consisting of pre-heating, postheating, and slow cooling, regardless of the depositing materials. © 2018 American Society of Civil Engineers
Description
Keywords
Lasers, Cladding, Heat treatments, Heat affected zone, Microstructure, Railways
Citation
Lai. Q., Abrahams, R., Mutton, P., Qiu, C., Paradowska, A., Soodi, M., Roy, T., & Yan, W. (2017). Laser cladding for railway repair: influence of depositing materials and heat treatment on microstructural characteristics. In Zhai, W., & Wang, K. C. P. (eds) ICRT 2017, Railway Development, Operations, and Maintenance. Paper presented at the First International Conference on Rail Transportation, July 10–12, 2017, Chengdu, Sichuan Province, China. Retrieved from https://ascelibrary.org/doi/book/10.1061/9780784481257