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Gas-Solid Interaction of a Cold Work Tool Steel with Nitrogen - A Synchrotron Study

  • : Huth, S1
  • : 1Ruhr University Bochum
  • : PDF Download
  • : 2012

Abstract

Powder metallurgy is state of the art in tool steel production, since it leads to improved microstructures and mechanical properties compared to conventional metallurgy. Besides HIP, supersolidus liquid-phase sintering (SLPS) allows complete densification of prealloyed powders by adjusting an appropriate amount of liquid phase. During sintering the material is exposed to a gaseous atmosphere, which in case of nitrogen may lead to a nitriding of the steel. In case of cold work tool steels, nitrogen lowers the solidus temperature and therefore improves sinterability, but it also restrains hardenability due to the risk of retained austenite. Therefore both, the process and application properties, need to be analyzed. In this contribution an in-situ energy dispersive diffraction study clarifies microstructural processes during sintering of X230CrVMo13-4 (DIN 1.2380 / AISI D2) powder under nitrogen atmosphere. Additionally, ex-situ angle dispersive diffraction with synchrotron radiation shows the effect of gas-solid interaction on carbon content and hardenability.
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