Effect Of Laser Hardening On Microstructure And Wear Resistance In Medium. Carbon/Chromium Steels

Jan Kusinski; Gareth Thomas

doi:10.1117/12.938896

12 November 1986 Effect Of Laser Hardening On Microstructure And Wear Resistance In Medium. Carbon/Chromium Steels

Jan Kusinski, Gareth Thomas

Proceedings Volume 0668, Laser Processing: Fundamentals, Applications, and Systems Engineering; (1986) https://doi.org/10.1117/12.938896
Event: 1986 Quebec Symposium, 1986, Quebec City, Canada

Abstract

Metallographical (optical, TEM, SEM), spectroscopic, abrasive wear resistance and microhardness investiga-tions of Fe/Cr/Mn/C steels heat-treated by a continuous CO₂ laser are described. Laser hardening resulted in wear resistance of 1.4 - 1.6 times better than that of conventionally hardened steels. Laser melting followed by rapid solidification allows formation of a solidified layer with high wear resistance only when the scanning velocity and mass of the samples were sufficient to realize high cooling rates. The variations in the wear resistance and microhardness with distance from the heated surface were similar. The grain refinement caused by rapid laser-heating and high stresses induced during cooling create essentially fine, highly dislocated lath and internally twinned martensites with some amount of stable, interlath retained austenite. This structure has in turn beneficial effects on wear resistance, and toughness. Laser-heat treatment for deep melting of the surface layers of the steels shows only a small improvement in wear resistance. Such heat-treatment results in delta ferrite retention (10Cr steel) and chromium segregation to cell-boundaries.

Citation Download Citation

Jan Kusinski and Gareth Thomas "Effect Of Laser Hardening On Microstructure And Wear Resistance In Medium. Carbon/Chromium Steels", Proc. SPIE 0668, Laser Processing: Fundamentals, Applications, and Systems Engineering, (12 November 1986); https://doi.org/10.1117/12.938896

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