Laser Surface Treatment Of AISI 420 Tool Steel

R. Vilar; R. M. Miranda; A. S. Oliveira

doi:10.1117/12.968903

16 January 1988 Laser Surface Treatment Of AISI 420 Tool Steel

R. Vilar, R. M. Miranda, A. S. Oliveira

Proceedings Volume 0952, Laser Technologies in Industry; (1988) https://doi.org/10.1117/12.968903
Event: Laser Technologies in Industry, 1988, Porto, Portugal

Abstract

Samples of a martensitic stainless steel containing 0.47%C and 12.8%Cr were surface melted using continuous wave CO₂ laser radiation and a multiple pass technique. The structure of the laser modified layer was studied by optical microscopy, scanning electron microscopy and X ray diffraction. The melted zone presents a narrow region near the fusion line with a ferritic--martensitic structure, that seems to have solidified by an almost partitionless mechanism. It is followed by a cellular-dendritic structure in the center of the melted trail, that consists on δ -ferrite, martensite and M23C6 carbide. The absence of austenite is surprising; it can be explained by the tempering effects of the solidification structure, due to subsequent laser passes.

Citation Download Citation

R. Vilar, R. M. Miranda, and A. S. Oliveira "Laser Surface Treatment Of AISI 420 Tool Steel", Proc. SPIE 0952, Laser Technologies in Industry, (16 January 1988); https://doi.org/10.1117/12.968903

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