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Weld metal microstructures of hardfacing deposits produced by self-shielded flux-cored arc welding

Journal Article


Abstract


  • The molten pool weld produced during self-shielded flux-cored

    arc welding (SSFCAW) is protected from gas porosity arising

    from oxygen and nitrogen by reaction (“killing”) of these gases

    by aluminium. However, residual Al can result in mixed microstructures

    of δ-ferrite, martensite and bainite in hardfacing weld

    metals produced by SSFCAW and therefore, microstructural

    control can be an issue for hardfacing weld repair.

    The effect of the residual Al content on weld metal microstructure

    has been examined using thermodynamic modeling and

    dilatometric analysis. It is concluded that the typical Al content

    of about 1 wt% promotes d-ferrite formation at the expense of

    austenite and its martensitic/bainitic product phase(s), thereby

    compromising the wear resistance of the hardfacing deposit.

    This paper also demonstrates how the development of a

    Schaeffler-type diagram for predicting the weld metal microstructure

    can provide guidance on weld filler metal design to

    produce the optimum microstructure for industrial hardfacing

    applications.

Publication Date


  • 2015

Citation


  • Dumovic, M., Monaghan, B. J., Li, H., Norrish, J. & Dunne, D. P. (2015). Weld metal microstructures of hardfacing deposits produced by self-shielded flux-cored arc welding. Australasian Welding Journal, 60 (1), 40-48.

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/5600

Number Of Pages


  • 8

Start Page


  • 40

End Page


  • 48

Volume


  • 60

Issue


  • 1

Place Of Publication


  • Australia

Abstract


  • The molten pool weld produced during self-shielded flux-cored

    arc welding (SSFCAW) is protected from gas porosity arising

    from oxygen and nitrogen by reaction (“killing”) of these gases

    by aluminium. However, residual Al can result in mixed microstructures

    of δ-ferrite, martensite and bainite in hardfacing weld

    metals produced by SSFCAW and therefore, microstructural

    control can be an issue for hardfacing weld repair.

    The effect of the residual Al content on weld metal microstructure

    has been examined using thermodynamic modeling and

    dilatometric analysis. It is concluded that the typical Al content

    of about 1 wt% promotes d-ferrite formation at the expense of

    austenite and its martensitic/bainitic product phase(s), thereby

    compromising the wear resistance of the hardfacing deposit.

    This paper also demonstrates how the development of a

    Schaeffler-type diagram for predicting the weld metal microstructure

    can provide guidance on weld filler metal design to

    produce the optimum microstructure for industrial hardfacing

    applications.

Publication Date


  • 2015

Citation


  • Dumovic, M., Monaghan, B. J., Li, H., Norrish, J. & Dunne, D. P. (2015). Weld metal microstructures of hardfacing deposits produced by self-shielded flux-cored arc welding. Australasian Welding Journal, 60 (1), 40-48.

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/5600

Number Of Pages


  • 8

Start Page


  • 40

End Page


  • 48

Volume


  • 60

Issue


  • 1

Place Of Publication


  • Australia