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Fakulteta za strojništvo, Ljubljana (FSLJ)
  • Heat and surface treatment of pressure die-casting dies [Elektronski vir]
    Taljat, Boštjan ; Tušek, Janez, 1952- ; Ramovš, Jože, 1947-
    The aim of this work is to study the influence of mechanical and metallurgicalproperties of hot-work tool steels determined by heat treatment and thermal-chemical surface treatment on in-service life ... of pressure die-casting tooling. The study is performed on Uddeholm hot-work tool steels;Dievar, Orvar Supreme, QRO 90 Supreme, and Vidar Supreme. A number of heat treatment parameters, such as austenitizing temperature, quenching speed,heat treatment system, and different tempering approaches is studied. Thermal-chemical surface treatments such as nitriding and oxidation are also studied. To characterize the material, the hardness and toughness are measured and metallographic examin<ation is performed. A test apparatus is developed for assessment of thermal fatigue resistance of the materials, whichis estimated by the surface area of cracks developed on the surface of test specimens subjected to cyclic thermal loading. Material characterizationis performed at different stages of the thermal fatigue test to study the evolution of mechanical and metallurgical properties throughout the service life. Temperature transients at different locations of test specimens are measured and used in computation of transient stresses performedby finite elements. A relationship between the thermal fatigue resistance and surface stresses is developed. It is also expressed as a function of the initial material properties and the material type.
    Vir: Zbornik referatov = conference proceedings [Elektronski vir] ([13] f.)
    Vrsta gradiva - prispevek na konferenci
    Leto - 2004
    Jezik - angleški
    COBISS.SI-ID - 7520539

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