Abstract
The effects of high-energy laser beam irradiation on surface hardening and microstructural modification in a ductile cast iron (DCI) alloy are investigated in this study. The ductile cast iron alloy samples were irradiated by using an Nd-YAG Pulsed Laser, and then their microstructures and hardness were examined. Upon irradiation, the unirradiated microstructure containing graphite and the tempered ferrite& bainite matrices was changed to martensite and retained austenite, together with the complete or partial dissolution of graphites. This microstructural modification improved greatly the surface hardness due to transformation of martensite whose amount and type were determined by X-Ray diffraction technique. The results indicated that the irradiated surface was heated up to about 1100C° to 1200 C° and then quenched to room temperature, which was enough to obtain surface hardening through martensitic transformation. Phases analysis of the irradiated surface layer was also carried out using a metallurgical method to understand the surface hardening of the DCI alloy and to compare with X-Ray diffraction technique results.
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Mahmoud, A.K. (2013). Surface Hardening of Ductile Cast - Iron Using Pulsed Laser Beams. In: Jármai, K., Farkas, J. (eds) Design, Fabrication and Economy of Metal Structures. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-36691-8_95
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DOI: https://doi.org/10.1007/978-3-642-36691-8_95
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