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Manufacturing of Functionally Graded PM Materials for Hot Work Tools

  • : Najmeh Vahed1, Bernd-Arno Behrens2, Kai-Uwe Volker3, Helmut Brand4, Martin Bonhage2
  • : 1Leibniz University of Hannover (LUH), 2Leibniz University of Hannover, 3Bodycote, 4Forschungsgemeinschaft Werkzeuge und Werkstoffe e.V.
  • : PDF Download
  • : 2014

Abstract

This work is focused on increasing the local wear resistance of PM components by producing an adapted hard material gradient in highly stressed areas. The production principles are investigated by axial pressing and sintering of cylindrical specimens. The gradients are produced by dispersing carbide metal powder (TiC, WC) in a ductile matrix powder (St). In the next step, a graded forging die made of TiC for a high wear resistance on the functional surface area and an iron based powder (Ferro Titanit®) for a ductile core is fabricated. In order to achieve a full compaction and high mechanical properties, the graded die is manufactured by hot isostatic pressing. Using the near-net-shape approach, a solid mold part is applied during pressing to give the graded powder the die contour geometry. Thereby, the gradient structure can be produced parallel to the die contour and an excessive material removal through final machining is avoided.
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