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  • 1.
    Holmberg, Jonas
    et al.
    RISE Research Institutes of Sweden, Materials and Production, Manufacturing Processes. University West, Sweden.
    Wretland, Anders
    GKN Aerospace Sweden AB, Sweden.
    Berglund, Johan
    RISE Research Institutes of Sweden, Materials and Production, Manufacturing Processes.
    Beno, Tomas
    University West, Sweden.
    A detailed investigation of residual stresses after milling Inconel 718 using typical production parameters for assessment of affected depth2020In: Materials Today Communications, ISSN 2352-4928, Vol. 24, article id 100958Article in journal (Refereed)
    Abstract [en]

    Production of superalloy gas turbine parts involves time consuming milling operations typically performed in a sequence from rough to finish milling. Rough milling using ceramic inserts allows high removal rates but causes severe sub-surface impact. A relatively large allowance is therefore left for subsequent cemented carbide milling. With increased knowledge of the affected depth it will be possible to reduce the machining allowance and increase efficiency of the manufacturing process. Milling Inconel 718 using typical production parameters has been investigated using new and worn ceramic and cemented carbide inserts. Residual stresses in a milled slot were measured by x-ray diffraction. Stresses were measured laterally across the slot and below the surface, to study the depth affected by milling. The most important result from this work is the development of a framework concerning how to evaluate the affected depth for a milling operation. The evaluation of a single milled slot shows great potential for determining the optimum allowance for machining. Our results show that the residual stresses are greatly affected by the ceramic and cemented carbide milling; both regarding depth as well as distribution across the milled slot. It has been shown that it is important to consider that the stresses across a milled slot are the highest in the center of the slot and gradually decrease toward the edges. Different inserts, ceramic and cemented carbide, and tool wear, alter how the stresses are distributed across the slot and the affected depth.

  • 2.
    Liens, Alethea
    et al.
    Université de Lyon, France; ANTHOGYR, France.
    Reveron, Helen
    Université de Lyon, France.
    Douillard, Thierry
    Université de Lyon, France.
    Blanchard, Nicholas
    Université de Lyon, France.
    Lughi, Vanni
    University of Trieste, Italy.
    Sergo, Valter
    University of Trieste, Italy; University of Macau, China.
    Laquai, Rene
    BAM Bundesanstalt für Materialforschung und -Prüfung, Germany.
    Müller, Bernd
    BAM Bundesanstalt für Materialforschung und -Prüfung, Germany.
    Bruno, Giovanni
    BAM Bundesanstalt für Materialforschung und -Prüfung, Germany.
    Schomer, Sven
    MOESCHTER GROUP Holding GmbH, Germany.
    Fürderer, Tobias
    MOESCHTER GROUP Holding GmbH, Germany.
    Adolfsson, Erik
    RISE Research Institutes of Sweden, Materials and Production, Manufacturing Processes.
    Courtois, Nicolas
    ANTHOGYR, France.
    Swain, Michael
    University of Sydney, Australia; Don State Technical University, Russia.
    Chevalier, Jerome
    Université de Lyon, France.
    Phase transformation induces plasticity with negligible damage in ceria-stabilized zirconia-based ceramics2020In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 183, p. 261-273Article in journal (Refereed)
    Abstract [en]

    Ceramics and their composites are in general brittle materials because they are predominantly made up of ionic and covalent bonds that avoid dislocation motion at room temperature. However, a remarkable ductile behavior has been observed on newly developed 11 mol.% ceria-stabilized zirconia (11Ce-TZP) composite containing fine alumina (8 vol.% Al2O3) and elongated strontium hexa-aluminate (8 vol.% SrAl12O19) grains. The as-synthesized composite also has shown full resistance to Low Temperature Degradation (LTD), relatively high strength and exceptionally high Weibull modulus, allowing its use in a broader range of biomedical applications. In this study, to deepen the understanding of plastic deformation in Ce-TZP based composites that could soon be used for manufacturing dental implants, different mechanical tests were applied on the material, followed by complete microstructural characterization. Distinct from pure Ce-TZP material or other zirconia-based ceramics developed in the past, the material here studied can be permanently strained without affecting the Young modulus, indicating that the ductile response of tested samples cannot be associated to damage occurrence. This ductility is related to the stress-induced tetragonal to monoclinic (t-m) zirconia phase transformation, analogue to Transformation-Induced Plasticity (TRIP) steels, where retained austenite is transformed to martensite. The aim of this study is to corroborate if the observed plasticity can be associated exclusively to the zirconia t-m phase transformation, or also to microcraking induced by the transformation. The t-m transformed-zones produced after bending and biaxial tests were examined by X-ray refraction and SEM/TEM coupled with Raman. The results revealed that the observed elastic-plastic behavior occurs without extensive microcracking, confirming a purely elastic-plastic behavior driven by the phase transformation (absence of damage).

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