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  • The effect of cold work on the sensitisation of austenitic stainless steels = Vpliv hladne deformacije na povečanje občutljivosti nerjavnih jekel
    Dománková, Mária ; Marek, Peter ; Moravčík, Roman
    The sensitisation behaviour of austenitic stainless steel is greatly influenced by several metallurgical factors, such as the chemical composition, the degree of prior deformation, the grain size, ... and the ageing temperature and time. The precipitation behaviour of AISI 316 and 304 austenitic stainless steels has been investigated after ageing at various temperatures from 500 °C to 900 °C for 0.1 h to 1000 h. The TTS diagrams of the experimental steels after an oxalic-acid etch test ASTM A262 practice A were constructed. It was demonstrated that the C curves of the TTS diagrams were displaced towards shorter times by the increment of 20 % cold work (CW), since the sites inside the grain matrix have a high energy and the carbides can nucleate there easily. Cold work increases the number of dislocations/dislocation pipes along which the diffusion rate of chromium is very high. The sensitisation of the experimental steels accelerated the precipitation of M23C6. Besides M23C6, the s-phase and M6C were detected at the grain boundaries and in the austenitic matrix in the case of the cold-worked samples.
    Vir: Materiali in tehnologije = Materials and technology. - ISSN 1580-2949 (Letn. 41, št. 3, maj/jun. 2007, str. 131-134)
    Vrsta gradiva - članek, sestavni del
    Leto - 2007
    Jezik - angleški
    COBISS.SI-ID - 606634

    Povezava(-e):

    Digitalna knjižnica Slovenije - dLib.si

vir: Materiali in tehnologije = Materials and technology. - ISSN 1580-2949 (Letn. 41, št. 3, maj/jun. 2007, str. 131-134)

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