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  • Diagnostics of the microstructural changes in sub-zero-processed Vanadis 6 P/M ledeburitic tool steel = Diagnostika sprememb mikrostrukture pri kriogeni obdelavi P/M ledeburitnega orodnega jekla Vanadis 6
    Sobotová, Jana ...
    Specimens made from P/M Vanadis 6 cold-work steel were austenitized, quenched and tempered for various combinations of the parameters. The selected sets of samples, also in the sub-zero range, were ... treated at a temperature of -196 °C after quenching. The microstructure was investigated as a function of the austenitizing temperature and the parameters of the sub-zero processing using transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM) and X-ray diffraction. It was found that the as-quenched microstructure is composed of martensite, retained austenite and carbides. The sub-zero processing reduced the amount of retained austenite and led to an increase in the tetragonality of the martensitic lattice. As a result, the hardness of the material was higher by 2 HRc before the tempering of the samples after the sub-zero processing, but the hardness of the sub-zero-processed material after tempering is about 2.5 HRc lower than that of the non-sub-zero-processed steel. Based on the facts that the sub-zero-processed steel contained less retained austenite and an unknown amount of the expected nano-precipitates, we expected it to have a lower capability to manifest the secondary-hardening effect.
    Source: Materiali in tehnologije = Materials and technology. - ISSN 1580-2949 (Letn. 47, št. 1, jan.-feb. 2013, str. 93-98)
    Type of material - article, component part
    Publish date - 2013
    Language - english
    COBISS.SI-ID - 954538

    Link(s):

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

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