Einfluss von Silizium auf Struktur und mechanische Eigenschaften von nitrierten Randzonen in 5% Cr martensitischen Stählen

Translated title of the contribution: Influence of silicon on the structure and mechanical properties of nitrided surface zone in a 5%Cr martensitic steels

Miloslav Ognianov

Research output: ThesisDiploma Thesis

Abstract

Hot work tool steels are widely used as thermal and mechanical highly stressed hot work tools for pressure die casting moulds, die insert, steel forging and extrusion tools for metal alloys and plastics. Plasma-nitriding has proved to increase the lifetime of such tools by mechanism of the precipitation hardening. To optimize the mechanical properties, it is indispensable to determine and understand the mechanisms which occur in the near-surface zone during nitriding. The influence of silicon content on the formation of nitride precipitations in the near surface zone during nitriding and their mechanical properties were investigated in comparison of a low and high silicon grade steel of the type X 38 CrMoV 5 1 (AlSI H13). Nitrogen and carbon profiles obtained by glow discharge optical emission spectroscopy (GDOES) and studies of the nanostructure by small angle X-ray scattering (SAXS). Microhardness and residual stress profiles show the correlation of the microstructure with mechanical properties. Ductility investigations and bending tests of the nitrding samples have been carried. The background of this thesis includes a broad review of state of the art about the plasma-nitriding of tool steels.
Translated title of the contributionInfluence of silicon on the structure and mechanical properties of nitrided surface zone in a 5%Cr martensitic steels
Original languageGerman
QualificationDipl.-Ing.
Supervisors/Advisors
  • Ebner, Reinhold, Supervisor (internal)
Award date17 Dec 2010
Publication statusPublished - 2010

Bibliographical note

embargoed until 07-09-2015

Keywords

  • nitriding
  • hot work tool steel
  • influence of silicon
  • precipitation hardening
  • nanostructure

Cite this