Hardening and remelting using high-power light sources and lasers

Hans Kurt Toenshoff; Michael Rund

doi:10.1117/12.184771

7 September 1994 Hardening and remelting using high-power light sources and lasers

Hans Kurt Toenshoff, Michael Rund

Proceedings Volume 2207, Laser Materials Processing: Industrial and Microelectronics Applications; (1994) https://doi.org/10.1117/12.184771
Event: Europto High Power Lasers and Laser Applications V, 1994, Vienna, Austria

Abstract

High-power beam processes can be used for the surface treatment of metals (hardening, remelting, alloying, coating, etc.). Both the laser and the electron beam are occasionally being used at the moment. Whereas high flexibility is a definite advantage of lasers and electron beams over conventional processes, disadvantages include high costs and, especially for lasers, limited output power. As an alternative to these high-power beam technologies, the Laser Zentrum Hannover has developed an alternative beam process for surface treatment using a high-power light source. A comparison of arc lamps with lasers for surface treatment shows that light sources have advantages: a lower investment due to a simple set up, a high maximum power output of 50 kW, a large maximum track width, easy workpiece preparation, as no absorption enhancing coatings are necessary, and simple operation and maintenance. Disadvantages are the limited flexibility and accessibility regarding workpiece geometry and beam size, and the limited beam power density of 3500 W/cm². Investigations are carried out for hardening steel 90 MnVCr8 and remelting spheroidal cast iron GGG 60 with beam power up to 46 kW, and different track widths from 5 - 120 mm. For steel, an edge hardness of up to 1000 HV0.2 was achieved, which was kept constant across nearly the whole surface, using the self quenching effect. For hardening without surface melting, maximum hardness depths of 3 mm were obtained. By remelting cast iron, hard ledeburitic edge zones up to 2.5 mm thick are formed, which show a nearly homogeneous edge hardness of about 900 HV0.2.

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Hans Kurt Toenshoff and Michael Rund "Hardening and remelting using high-power light sources and lasers", Proc. SPIE 2207, Laser Materials Processing: Industrial and Microelectronics Applications, (7 September 1994); https://doi.org/10.1117/12.184771

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