Development of hard coatings for press hardening processes
Research output: Thesis › Diploma Thesis
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2011. 73 p.
Research output: Thesis › Diploma Thesis
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TY - THES
T1 - Development of hard coatings for press hardening processes
AU - Maringer, Christian
N1 - embargoed until 06-06-2016
PY - 2011
Y1 - 2011
N2 - 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.
AB - 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.
KW - Cr-Si-N
KW - Presshärten
KW - adhäsiver Verschleiß
KW - Struktur
KW - Morphologie
KW - Härte
KW - Eigenspannung
KW - Oxidation
KW - Lichtbogenverdampfung
KW - Cr-Si-N
KW - press hardening
KW - adhesive wear
KW - structure
KW - morphology
KW - hardness
KW - residual stress
KW - oxidation behaviour
KW - arc evaporation
M3 - Diploma Thesis
ER -