Title

SURFACE HARDENING OF A VC131 COLD WORK STEEL USING A FIBER LASER

SURFACE HARDENING OF A VC131 COLD WORK STEEL USING A FIBER LASER

Authorship

Goia, Flavia Aline; Lima, Milton Sergio Fernandes de

Goia, Flavia Aline

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Lima, Milton Sergio Fernandes de

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DOI

10.5151/2594-5327-16141

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Abstract

Laser surface treatments represent some of most advanced and versatile processes for enhanced materials applications. Laser hardening is a technique to generate a hard wear-resistant surface microstructure in metals due to the rapid heating and cooling cycles imposed by a laser beam. This work intends to understand the influence of the laser variables on the hardness after laser hardening of a VC131 steel. A fiber laser, which is a new source available for industrial applications, has been used. The overall absorptivity measured was approximately 37% and the laser treatment produced two different zones: remelted and heat-affected. The surface layer was remelted and composed by martensite and retained austenite. The region next to the free surface is composed by primary austenite dendrites with martensite plates with hardness between 400 and 500 HV. The region called heat-affect zone is composed by martensite, retained austenite and carbides and has hardness up to 800 HV. The case depth in laser treated samples was between 1 and 2 mm.

Laser surface treatments represent some of most advanced and versatile processes for enhanced materials applications. Laser hardening is a technique to generate a hard wear-resistant surface microstructure in metals due to the rapid heating and cooling cycles imposed by a laser beam. This work intends to understand the influence of the laser variables on the hardness after laser hardening of a VC131 steel. A fiber laser, which is a new source available for industrial applications, has been used. The overall absorptivity measured was approximately 37% and the laser treatment produced two different zones: remelted and heat-affected. The surface layer was remelted and composed by martensite and retained austenite. The region next to the free surface is composed by primary austenite dendrites with martensite plates with hardness between 400 and 500 HV. The region called heat-affect zone is composed by martensite, retained austenite and carbides and has hardness up to 800 HV. The case depth in laser treated samples was between 1 and 2 mm.

Keywords

Surface hardening; Laser hardening; Steel hardening; Laser processing.

Surface hardening; Laser hardening; Steel hardening; Laser processing.