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A Study on the Surface Hardening of SCM4 Steel Using a Continuous Wave Nd:YAG Laser  

Na, Gi-Dae (조선대학교 기계설계공학과)
Shin, Byung-Heon (조선대학교 일반대학원 정밀기계공학과)
Shin, Ho-Jun (조선대학교 일반대학원 정밀기계공학과)
Yoo, Young-Tae (조선대학교 메카트로닉스공학과)
Publication Information
Transactions of the Korean Society of Machine Tool Engineers / v.16, no.5, 2007 , pp. 24-32 More about this Journal
Abstract
Laser surface hardening is beneficially used for surface treatment of structural steel. Due to very rapid heating and cooling rates, structural low-alloy steel(SCM4) can be hardened as self quenching. The aim of this research project is to improve the influence of the process laser parameters: laser power, spot size, surface roughness, and traverse speed. The laser beam is allowed to scan on the surface of the workpiece at the constant power(1095W), varying the traverse speed at 0.3m/min, 0.5m/min and 0.8m/min. The optical lens with the elliptical profile is designed to obtain a wide surface hardening area with uniform hardness. From the results of the experiment, it has been shown that the stable hardness is about 600$\sim$700Hv, when the laser power, focal position and the traverse speed are P=1095W, z=0mm and v=0.3m/min.
Keywords
CW Nd:YAG laser; Surface Hardening; Structural Low-alloy Steel; Surface Roughness;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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