Crack Growth Resistance of Laser Surface Remelted Nodular Cast Iron

    Volume 8, Issue 3 (March 2011)

    ISSN: 1546-962X

    CODEN: JAIOAD

    Published Online: 14 March 2011

    Page Count: 12


    Šturm, Roman
    Faculty of Mechanical Engineering, Univ. of Ljubljana, Ljubljana,

    Grum, Janez
    Faculty of Mechanical Engineering, Univ. of Ljubljana, Ljubljana,

    (Received 1 October 2010; accepted 14 February 2011)

    Abstract

    The laser surface remelting (LSR) process is applied to modify the surface properties of nodular cast iron and is suitable for manufacture of various machine and tool parts. Usually, studies of surface remelted layers include microstructural and microchemical analyses, measurements of residual stresses, and various wear and corrosion tests. This paper will represent microstructural and microhardness analyses of the thin surface layer after laser remelting of nodular cast iron 500-7. Particular attention is paid to fatigue crack initiation and propagation tests. Crack initiation and growth behavior was assessed under bending test conditions. The comparison is made between as-received nodular cast iron 500-7 and the same material, where one of the surfaces is altered with the LSR process. As the crack propagation is perpendicular to the laser remelted layer, the specimens with a thin laser surface remelted layer exhibited higher resistance to fatigue crack growth in the low stress intensity factor range ΔKth than as-received nodular cast iron specimens. Also, ΔKIC is higher in the case of the laser remelted surface.


    Paper ID: JAI103434

    DOI: 10.1520/JAI103434

    ASTM International is a member of CrossRef.

    Author
    Title Crack Growth Resistance of Laser Surface Remelted Nodular Cast Iron
    Symposium 18th IFHTSE Congress, 2010-07-26
    Committee E08