Influence of Surface Pretreatment on Residual Stress Field of Heat-Treated Steel Induced by Laser Local Quenching

Influence of Surface Pretreatment on Residual Stress Field of Heat-Treated Steel Induced by Laser Local Quenching

Y. Sakaida, Y. Sasaki, H. Owashi

Abstract. In order to clarify an influence of the surface pretreatment condition on the residual stress field after laser local quenching, three kinds of surface pretreatment were applied to the steel specimens. In this study, the mirror-polished, matte-black-painted and mechanical-polished surfaces were prepared, and were heat-treated by two times laser irradiation. After quenching, the irradiation marks and hardened layers were observed. The irradiation mark on the mirror-polished surface was insufficient. On the other hand, the hardened layers under the matte-black painted and mechanical-polished surfaces were formed enough. The residual stress fields of the latter two specimens were measured. As a result, surface pretreatment condition was found to make a big difference in both the 2θ-sin2ψ diagram and the residual stress field after laser quenching. Therefore, in order to investigate these causes, surface temperature histories during laser irradiation were monitored using a radiation thermometer. From these results, it was clarified that the difference of the first heat-treatment temperature directly affects the presence or absence of residual stress gradient and the depth of hardened layer under the laser-irradiated surface. Finally, adequate surfaces for the steel parts before laser local quenching could be proposed.

Keywords
Laser Quenching, Carbon Steel, Residual Stress Field, Surface Pretreatment, X-Ray Stress Measurement, Quenching Temperature

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: Y. Sakaida, Y. Sasaki, H. Owashi, ‘Influence of Surface Pretreatment on Residual Stress Field of Heat-Treated Steel Induced by Laser Local Quenching’, Materials Research Proceedings, Vol. 6, pp 177-182, 2018

DOI: https://dx.doi.org/10.21741/9781945291890-28

The article was published as article 28 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.

References
[1] Edited by the Japan Society of Mech. Eng., Thermomechanical behavior of materials during transformation, theory and numerical simulation, Corona Pubishing. Co., Ltd: Tokyo, (1991), 142-162.
[2] Y. Sakaida and K. Tanaka, Change of x-ray elastic constants of carbon steel caused by quenching and effect of its change on x-ray stress measurement, J. the Society of Materials Science, Japan, 56-7 (2007) 602-608. https://doi.org/10.2472/jsms.56.602
[3] I. C. Noyan and J. B. Cohen, Residual stress; measurement by diffraction and interpretation, Springer-Verlag: New York, (1987), p. 134. https://doi.org/10.1007/978-1-4613-9570-6
[4] K. Suzuki, K. Tanaka and Y. Sakaida, Penetration depth in x-ray analysis of steep stress gradient near surface, J. the Society of Materials Science, Japan, 45-7 (1996) 759-765. https://doi.org/10.2472/jsms.45.759