Journal
TRIBOLOGY INTERNATIONAL
Volume 112, Issue -, Pages 94-102Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.triboint.2017.03.036
Keywords
Steel; Laser heat treatment; Surface modification; Wear resistance
Categories
Funding
- John Deere, Product Engineering Center, Waterloo, Iowa [125885]
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In this study, the effect of different shielding gas and laser scanning velocity on the resulting retained austenite (RA) content and tribomechanical properties of AISI 8620 steel were investigated. RA generation was comparatively lower at higher scanning velocity and with argon as the shielding gas due to lower beam interaction time and inert environment. Varied heat input and differing reaction volume resulted in different hardness levels on these samples. Air shielded samples showed slightly higher friction coefficient than the other samples due to higher surface roughness and shearing of oxide layers. The nitrogen shielded samples exhibited the best wear resistance among all samples, which was attributed to nitride formation on surface and to high hardness resulting from the laser treatment.
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