Open die forging of large shafts with porosity defects – physical and numerical modelling

Peter Christiansen, Jesper Henri Hattel, Niels Bay, Luis M. Alves, Paulo A. F. Martins

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    Abstract

    The aim and scope of this paper is centered to analyze the influence of the geometry of V-shaped dies on the closure of internal centerline porosity defects in ingots during multistep open-die forging. The investigation is performed with small scale physical models made from lead using V-shaped dies with 90o and 120o and a reference pair of flat parallel platens. Holes drilled through the center of these preforms are produced to mimic centerline porosity in full scale cast ingots and intermediate rotation of the preforms replicate a multi-stage forging sequence under laboratory testing conditions. The presentation is supported by finite element modelling using an in-house developed computer program and the overall investigation shows that better results in closure of centerline defects are obtained with a V-shaped die with 120º die angle.
    Original languageEnglish
    JournalKey Engineering Materials
    Volume554-557
    Pages (from-to)2145-2155
    ISSN1013-9826
    DOIs
    Publication statusPublished - 2013
    Event16th annual ESAFORM Conference on Material Forming - Aveiro, Portugal
    Duration: 22 Apr 201324 Apr 2013
    http://esaform2013.com/

    Conference

    Conference16th annual ESAFORM Conference on Material Forming
    Country/TerritoryPortugal
    CityAveiro
    Period22/04/201324/04/2013
    Internet address

    Keywords

    • Open die forging
    • V-shaped dies
    • Centerline porosity
    • Experimentation
    • Finite element modelling

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