Development of Residual Stresses During Laser Cladding

Development of Residual Stresses During Laser Cladding

A. Narayanan, M. Mostafavi, M. Pavier, M. Peeld

Abstract. Laser cladding rail steel with a hard-wearing martensitic stainless-steel coating is a possible technique for improving the track durability of rail networks. However, the cladding process induces significant residual stresses in the clad material, due to the thermal mismatch between the two materials and the shape changes during the martensitic phase transformation. Predictions of the residual stress remain poorly verified as the process is complex and measurements made on final clad parts can be influenced by multiple parameters. A cladded and heat-treated rail section was subject to sequential laser-pulses representative of the actual cladding process. The thermal cycle of these pulses is much simpler than real clads, easing the task of validating the component parts of simulations. Synchrotron X-ray diffraction was used to determine the phase selective residual stresses around the heated region before and after each pulse. In this manner it was possible to determine the change in stress due to a pulse and the degree of relaxation that is possible due to a neighbouring thermal cycle.

Keywords
Cladding, Synchrotron X-Ray Diffraction, Stress-Measurement, Rail

Published online 9/11/2018, 6 pages
Copyright © 2018 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA

Citation: A. Narayanan, M. Mostafavi, M. Pavier, M. Peeld, ‘Development of Residual Stresses During Laser Cladding’, Materials Research Proceedings, Vol. 6, pp 45-50, 2018

DOI: http://dx.doi.org/10.21741/9781945291890-8

The article was published as article 8 of the book Residual Stresses 2018

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

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