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  • Effect of the initial microstructure on the properties of low-alloyed steel upon mini-thixoforming = Vpliv začetne mikrostrukture na lastnosti malolegiranega jekla po predelavi mini-thixoforming
    Mašek, Bohuslav ; Aišman, David ; Jirková, Hana
    Thixoforming is an unconventional forming process based on semi-solid processing. Semi-solid processing involves heating the feedstock to a temperature at which it becomes partly liquid and partly ... solid. Thanks to partial melting and rapid solidification, unconventional microstructures can be obtained even in conventional materials. Today%s research efforts mainly involve high-alloyed steels with a wide freezing range at lower temperatures. By contrast, low-alloyed steels with the solidification temperatures above 1400 °C are not under extensive investigation. The main objective of the study was to find whether and how the attributes of the feedstock microstructure can be transmitted to the final semi-solid processed microstructure of the 30MnVS6 microalloyed steel. The first stage of the experiment involved mini-thixoforming of the as-received specimens of the steel. In order to assess the effects of the initial microstructure, specimens with three types of microstructure were prepared with high-pressure torsion (HPT), a severe-plastic-deformation (SPD) technique. Initial and final microstructures were examined using light and electron microscopes and image-analysis techniques. The phase composition was determined with the aid of the X-ray diffraction analysis. The mechanical properties were determined with tensile and hardness testing. Information on the local properties and the properties of microstructure constituents was obtained with microhardness measurement.
    Vir: Materiali in tehnologije = Materials and technology. - ISSN 1580-2949 (Letn. 48, št. 5, sep.-oct. 2014, str. 719-723)
    Vrsta gradiva - članek, sestavni del ; neleposlovje za odrasle
    Leto - 2014
    Jezik - angleški
    COBISS.SI-ID - 1096106

    Povezava(-e):

    http://mit.imt.si/Revija/
    Digitalna knjižnica Slovenije - dLib.si

vir: Materiali in tehnologije = Materials and technology. - ISSN 1580-2949 (Letn. 48, št. 5, sep.-oct. 2014, str. 719-723)

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