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  • Differential scanning calorimetry study of the solidification of austenitic stainless steel
    Pirnat, Miran ; Steiner Petrovič, Darja
    Stainless steels are considered as promising materials in many conventional and strategic applications in power, chemical, petrochemical, refinery, pulp and paper, and marine sectors, owing to their ... excellent combination of mechanical and corrosion-resistance properties. Austenitic stainless steels of types 304 L and 316 L are commonly selected. Solidification cracking is one of the most severe problems in the welding of austenitic stainless steels (1). Microstructural evolution during solidification and the phase balance are relevant to cracking behaviour (2). The purpose of this study was to follow the sequence of solidification of the austenitic stainless steel at different cooling rates. The alloy used in this study was austenitic stainless steel of an AISI 304 L type (Table 1). Differential scanning calorimetric (DSC) analyses were performed in the range 200 - 1550 - 100 [compositum]C. Table 1 Characteristics of the AISI 304 L steel used in the present investigation. Cr eq. Ni eq. Cr eq./Ni eq. Ferrite Number AISI 304 L 19.09 12.96 1.473 3.28 The experiments were performed using a Mettler-Toledo TGA/DSC1 instrument. In dynamic measurements, the furnace was linearly heated from 200 [compositum]C to 1550 [compositum]C at heating ramps of 5, 10, and 40 K/min. The solidification scans from 1550 [compositum]C down to 100 [compositum]C involved the same cooling rates (5, 10, and 40 K/min). The atmosphere used was Ar of 99.999% purity and a 50 ml/min. flow rate to minimize the sample oxidation. The experiments were performed with 3x3x3 mm 3 samples of austenitic stainless steel AISI 304 L, weighting approximately 0.2 g, and with an empty reference pan, both as heating (melting) and cooling (solidification) scans. For the purposes of this study the DSC signal was evaluated. Typical DSC thermograms obtained during the melting and solidification of AISI 304 L at 5, 10, and 40 K/min. will be shown. The effects of the scan rates on the melting and solidification curves will be discussed. Following the DSC measurements the samples were metallographically analyzed using light microscopy and FE-SEM/EDS in order to reveal the variations in the solidification microstructures.
    Vir: Technical program of the 38th north american thermal analysis society conference, August 15-18, 2010, Houston Hall, University of Pennsylvania, Philadelphia, Pennsylvania [Elektronski vir] (1 str.)
    Vrsta gradiva - prispevek na konferenci
    Leto - 2010
    Jezik - angleški
    COBISS.SI-ID - 879018

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