Development of hard coatings for press hardening processes

Christian Maringer

Research output: ThesisDiploma Thesis

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Abstract

The increasing energy prices during the last decade boosted the lightweight design in automotive industry. One result of these developments is to use high strength steels e.g. USIBOR® 1500. Such steel sheets are formed in press hardening processes where especially an enhanced adhesive wear is present. In this thesis, hard coatings within the system Cr-Si-N are investigated with the focus to reduce the adhesive wear during press hardening processes. Therefore, Cr-Si-N coatings with Silicon contents up to 17.5 at% (on the metal sublattice) were deposited by physical vapour deposition using arc evaporation. Detailed investigations of the coatings prepared concentrate on structure, morphology, hardness, residual stress and thermal stability as a function of their Si content. The thermal stability tests include structure, mechanical properties and oxidation characterization after annealing in vacuum and ambient atmosphere at 400 °C and 800 °C. Furthermore the friction and wear behaviour was investigated by ball on disk tests at room temperature and 800 °C. Additional to these investigations special application near measurements on an OPTIMOL® SRV tester and Hardware tests were conducted.
Translated title of the contributionEntwicklung von Hartstoffschichten für das Presshärten von hochfesten Automobilblechen
Original languageEnglish
QualificationDipl.-Ing.
Awarding Institution
  • Montanuniversität
Supervisors/Advisors
  • Mayrhofer, Paul Heinz, Supervisor (internal)
  • Müller, Arnd, Supervisor (external), External person
Award date1 Jul 2011
Publication statusPublished - 2011

Bibliographical note

embargoed until 06-06-2016

Keywords

  • Cr-Si-N
  • press hardening
  • adhesive wear
  • structure
  • morphology
  • hardness
  • residual stress
  • oxidation behaviour
  • arc evaporation

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