A 1200 W diode laser was used to modify the surface properties of a fully-sintered ferrous PM material. Two modifications were investigated; transformation hardening of selected areas and sealing of surface porosity by re-melting. The diode laser was used because the beam footprint is large (5×0.5 mm) and the wavelength short (0.94 μm). Processed samples were examined using metallographic and hardness testing techniques. Results indicated that hardness comparable to induction hardening could be achieved and re-melting could be controlled to seal porosity. Further work now needs to be undertaken to convert this demonstrated potential into a commercial reality.
Surface Modification of Powder Metallurgy Components With a Direct Diode Laser
Contributed by the Materials Division for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received by the Materials Division January 10, 2003; revision received June 17, 2003. Associate Editor: A. Pelegri and A. Karlsson.
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Barnes , S., Nash , M. J., and Kwok, Y. K. (September 22, 2003). "Surface Modification of Powder Metallurgy Components With a Direct Diode Laser ." ASME. J. Eng. Mater. Technol. October 2003; 125(4): 372–377. https://doi.org/10.1115/1.1605111
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