Advances in Laser Surface Engineering: Tackling the Cracking Problem in Laser-Deposited Ni-Cr-B-Si-C Alloys

I. Hemmati, V. Ocelik, J. Th M. De Hosson*

*Bijbehorende auteur voor dit werk

    OnderzoeksoutputAcademicpeer review

    14 Citaten (Scopus)
    28 Downloads (Pure)

    Samenvatting

    Laser-deposition technologies are being increasingly used for surface modification and three-dimensional manufacturing applications. The biggest technical obstacle to a wider usage of these technologies especially for deposition of hard alloys is cracking of the deposited samples. In this work, the idea of microstructural refinement as a toughening mechanism for Ni-Cr-B-Si-C alloys deposited by laser cladding is evaluated and a new idea for reducing the cracking tendency of these alloys is proposed. The results show that although a significant refinement of the Cr-rich precipitates in these alloys could be induced by a suitable addition of Nb, the cracking susceptibility of the deposits was unchanged. This was so because the continuous network of hard eutectics was still providing an easy route for crack growth. The outcome of this work shows that an effective toughening mechanism for these alloys should include not only a refinement of the hard precipitates but also modification of the eutectic structure.

    Originele taal-2English
    Pagina's (van-tot)741-748
    Aantal pagina's8
    TijdschriftJOM
    Volume65
    Nummer van het tijdschrift6
    DOI's
    StatusPublished - jun-2013

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