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Characteristics of Surface Hardening by Laser Power Control in Real Time of Spheroidal Graphite Cast Iron  

Kim, Jongdo (Division of Marine Engineering, Korea Maritime and Ocean Univ.)
Song, Mookeun (Graduate School of Korea Maritime and Ocean Univ.)
Publication Information
Laser Solutions / v.18, no.2, 2015 , pp. 1-4 More about this Journal
Abstract
This study is related to the surface hardening treatment to spheroidal graphite cast iron for die by using high power diode laser. Laser device used in this experiment is capable of real-time laser power control. This is because the infrared temperature sensor (two color pyrometer) attached to the optical system measures the surface temperature of specimen and adjusts the laser power in real time. The surface treatment was carried out with the change of heat treatment temperature at the beam travel speed 3 mm/sec. Hardened width and depth was measured and hardened zone was analyzed by micro vickers hardness test in order to research the optimum condition of heat treatment. The changes in microstructure of the hardened zone also was examined. As a result of hardness measurement and observations on microstructure of hardened zone, hardness increased over three times as compared with base metal because the martensite was formed on the matrix structure.
Keywords
Surface hardening treatment; Spheroidal graphite cast iron; Real time laser power control; Hardened width and depth;
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  • Reference
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