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Title: Hardening efficiency and microstructural changes during laser surface hardening of 50CrMo4 steel
Authors: Maharjan, Niroj
Wu, Naien
Zhou, Wei
Keywords: Engineering::Mechanical engineering
Issue Date: 2021
Source: Maharjan, N., Wu, N. & Zhou, W. (2021). Hardening efficiency and microstructural changes during laser surface hardening of 50CrMo4 steel. Metals, 11(12), 2015-.
Project: #020408-00002 
Journal: Metals 
Abstract: Laser surface hardening is an attractive heat treatment solution used to selectively enhance the surface properties of components by phase transformation. A quantitative parameter to measure the efficacy of hardening processes is still lacking, which hinders its application in industries. In this paper, we propose a simple approach to assess the effectiveness of the process by calculating its thermal efficiency. The proposed method was applied to calculate the hardening efficiency during different laser processing conditions. This study revealed that only a small portion of supplied laser energy (approximately 1–15%) is utilized for hardening. For the same laser system, the highest efficiency is achieved when surface melting is just avoided. A comparative study showed that pulsed lasers are more efficient in energy utilization for hardening than continuous wave laser. Similarly, the efficiency of a high‐power laser is found to be higher than a low‐power laser and an increase in beam absorption produces higher hardening efficiency. The analysis of the hardened surface revealed predominantly martensite. The hardness value gradually decreased along the depth, which is attributed to the decrease in percentage of martensite.
ISSN: 2075-4701
DOI: 10.3390/met11122015
Schools: School of Mechanical and Aerospace Engineering 
Organisations: Advanced Remanufacturing and Technology Centre, A*STAR
Rights: © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// 4.0/).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MAE Journal Articles

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