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Proceedings Paper

Laser Surface Treatment Of AISI 420 Tool Steel
Author(s): R. Vilar; R. M. Miranda; A. S. Oliveira
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Paper 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.

Paper Details

Date Published: 16 January 1988
Proc. SPIE 0952, Laser Technologies in Industry, (16 January 1988); doi: 10.1117/12.968903
Show Author Affiliations
R. Vilar, Instituto Superior Tecnico (Portugal)
R. M. Miranda, Instituto Superior Tecnico (Portugal)
A. S. Oliveira, Instituto Superior Tecnico (Portugal)

Published in SPIE Proceedings Vol. 0952:
Laser Technologies in Industry
Silverio P. Almeida; Luis Miguel Bernardo; Oliverio D.D. Soares, Editor(s)

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