STP1532

    Surface Hardening of an AISI D6 Cold Work Steel Using a Fiber Laser

    Published: Apr 2012


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    Abstract

    Laser surface treatments represent some of the most advanced and versatile processes for enhanced materials applications. Laser hardening is a technique to generate a hard wear-resistant surface micro-structure 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 hardness after laser hardening of an AISI D6 steel. A fiber laser, which is a new source available for industrial applications, has been used. The overall absorptivity measured was ~37 % and the laser treatment produced two different zones: Remelted and heat-affected. The surface layer was remelted and composed of martensite and retained austenite. The region next to the free surface is composed of primary austenite dendrites with martensite plates with hardness between 400 and 500 HV. The region called the heat-affect zone is composed of martensite, retained austenite, and carbides and has a 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


    Author Information:

    Goia, Flavia Aline
    Divisão de Engenharia Mecânica (IEM), Instituto Tecnológico de Aeronáutica, São José dos Campos, SP

    de Lima, Milton Sergio Fernes
    Divisão de Fotônica (EFO), Instituto de Estudos Avançados, São José dos Campos, SP


    Paper ID: STP153220120035

    Committee/Subcommittee: D02.L0

    DOI: 10.1520/STP153220120035


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