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Title: Influence of operating parameters on morphology of laser hardened surfaces
Authors: Maharjan, Niroj
Zhou, Wei
Zhou, Yu
Wu, Naien
Keywords: Steel
Heat Treatment
DRNTU::Engineering::Mechanical engineering
Issue Date: 2018
Source: Maharjan, N., Zhou, W., Zhou, Y., & Wu, N. (2018). Influence of operating parameters on morphology of laser hardened surfaces. High-Power Laser Materials Processing: Applications, Diagnostics, and Systems VII. doi:10.1117/12.2288890
Abstract: Conventional heat treatment of a component is performed in a furnace whereby the component is continuously heated to a high temperature and quenched to get a hardened material. The furnace heating and tempering process take several hours which is expensive over a long run and less flexible. Laser transformation hardening is an attractive heat treatment technology which can be used to enhance the surface properties of highly stressed components such as cams, gears, and bearings without altering its bulk properties. The highly intense laser beam rapidly heats up the irradiated surface above its austenitization temperature which cools down instantaneously (self-quenching) as the laser moves away from the spot producing a hardened surface. The fast heating and cooling generate a non-equilibrium phase transformation of which very little is understood. An attempt was made to improve the surface properties of steel through solid solution hardening and microstructure refinement using a 250 W fiber laser. To identify the effect of various parameters on laser hardening, scanning conditions such as beam spot size, scan rate, power input, surface condition and overlap ratio were controlled. The change in hardness and morphology of laser treated surface were carefully investigated. The results show the surface hardness increased above 800 HV after laser treatment compared to 260 HV of the as-received specimen. It is found that austenitization has the highest effect on hardness achieved and can be controlled by proper choice of laser parameters and scanning rates.
DOI: 10.1117/12.2288890
Rights: © 2018 Society of Photo-optical Instrumentation Engineers (SPIE). This paper was published in High-Power Laser Materials Processing: Applications, Diagnostics, and Systems VII and is made available with permission of Society of Photo-optical Instrumentation Engineers (SPIE). The published version is available at: []. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MAE Conference Papers

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