استفاده از ليزر در سخت كاري سطحي فولادهاي متوسط كربن 1.1186 و 1.6582

Laser Surface Hardening of Medium Carbon Steels

Heat treating the surface of medium carbon steels to produce a hardened layer whilst retaining a tough core is widespread throughout general engineering and may be accomplished by using a number of different sources of energy; flame and induction heating are being common. In addition, the use of lasers is also a well-established process. The benefits attributed to the use of lasers are that they provide localised heat input, negligible distortion, the ability to treat specific areas, access to confined areas and short cycle times. The current work has investigated the relationships between the energy of laser (200-600 mj) and processing speed (10-150 mms-2) to harden a plain carbon and alloy steel. The steels, 1.1186 and 1.6582, have similar carbon contents (0.4%) and similar Mn contents (0.8%), but in addition 1.6582 contains 1.75% Ni, 0.8% Cr and 0.25% Mo. Microstructural examination of the treated surfaces revealed that conditions within the range examined were capable of producing structural changes and associated increases in hardness. Affected depths and maximum hardness achieved varied with energy and speed, as well as with steel type. Hardened depths of greater than 0.7mm were observed in both the plain carbon and the alloy steels. As would be expected, the maximum hardening effect was observed in the alloy steel, as was the maximum hardness.