Proceedings of the Korean Society of Precision Engineering Conference (한국정밀공학회:학술대회논문집)
- 1997.04a
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- Pages.998-1002
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- 1997
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- 2005-8446(pISSN)
The Characteristics of Ductile Cast Iron Heat-treated by $CO_2$ Laser
구상흑연주철의 $CO_2$ 레이저 표면경화 특성
Abstract
This study has been performed to predict beam absorption with analysis of temperature field by using a FEM in co /sab 2/ laser hardening and to invesrigate into some effects of power density and travel speed of laser beam on the microstructure and hardness of ductile cast iron treated by laser surface hardening technique. Optical micrograph has shown that large martensite and small amount of retained austenite appear in inside hardened zone. Hardness measurement has revealed that the range of maximum hardness value is Hv=415 .+-. 10. The power density increases and the travel speed decreases, the depth of hardened zone increases due to increase of input power density.
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