You are being redirected because this document is part of your ASTM Compass® subscription.
    This document is part of your ASTM Compass® subscription.

    If you are an ASTM Compass Subscriber and this document is part of your subscription, you can access it for free at ASTM Compass
    Volume 46, Issue 3 (November 2017)

    Correlation Between Machinability and Chip Morphology of Austempered Ductile Iron

    (Received 27 September 2016; accepted 6 February 2017)

    Published Online: 13 November 2017

    CODEN: JTEVAB

      Format Pages Price  
    PDF (1.50 MB) 10 $25   ADD TO CART

    Cite this document

    X Add email address send
    X
      .RIS For RefWorks, EndNote, ProCite, Reference Manager, Zoteo, and many others.   .DOCX For Microsoft Word



    Abstract

    In this work, macrostructure, microstructure, and work hardening of as-cast and austempered ductile iron chips produced by different cutting speeds were investigated. Cutting forces, surface roughness, and tool wear were also studied. After austenitizing at 900°C for 90 min, samples were austempered in a salt bath at 360°C for 90 min. Machinability tests were conducted with uncoated cemented carbide tools on a CNC lathe. The tests were carried out without using any lubricant. In these tests, the cutting speed was varied in the range 50–200 m/min, while the feed rate (0.12 mm/rev) and depth of cut (2 mm) were kept constant. The tangential, feed, and radial cutting force components acting on the tool holder were measured with a three-component dynamometer. The chips obtained during machining were polished by embedding into epoxy resin, examined with optical microscope and micrographs were taken. The microhardness values were measured on each chip sample. As the cutting speed was increased, deformation strengthening of the microstructure was increased, which decreased the tool life. It was also detected that during the machining, with the effect of cutting forces and stress, spheroidal graphites were broken off in the chip and lost their sphericity, so the chip became fragile and unstable and the graphite displayed a lubricant feature. At low cutting speed, a built-up edge was observed. However, as the cutting speed was increased because of heating, built-up edges were unstable.

    Author Information:

    Yazman, Ş.
    Technical Science College, Selcuk Univ., Konya,

    Gemı, L.
    Technical Science College, Necmettin Erbakan Univ., Konya,

    Uludağ, M.
    Faculty of Engineering, Selcuk Univ., Konya,

    Akdemır, A.
    Faculty of Aeronautical and Space Sciences, Necmettin Erbakan Univ., Konya,

    Uyaner, M.
    Faculty of Engineering, Selcuk Univ., Konya,

    Dişpinar, D.
    Faculty of Engineering, Istanbul Univ., Istanbul,


    Stock #: JTE20160490

    ISSN:0090-3973

    DOI: 10.1520/JTE20160490

    Author
    Title Correlation Between Machinability and Chip Morphology of Austempered Ductile Iron
    Symposium ,
    Committee F42