Calorimetric Study and Microstructural Investigation of Ferrite-Austenite Based Alloy
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MARINESCU, Cornelia, MUNTEANU, Cornel, KHOSHNAW, Fuad, TANASESCU, Speranta. Calorimetric Study and Microstructural Investigation of Ferrite-Austenite Based Alloy. In: Book of Abstracts: of the 28th Symposium on Thermal Analysis and Calorimetry – Eugen Segal – of the Commission for Thermal Analysis and Calorimetry of the Romanian Academy (CATCAR28), Ed. 28, 9-10 mai 2019, Chişinău. România, Arad: Gutenberg Univers Arad Publishing House, 2019, p. 58. ISBN 978-606-675-208-4.
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Book of Abstracts 2019
Simpozionul "28th Symposium on Thermal Analysis and Calorimetry – Eugen Segal – of the Commission for Thermal Analysis and Calorimetry of the Romanian Academy (CATCAR28) "
28, Chişinău, Moldova, 9-10 mai 2019

Calorimetric Study and Microstructural Investigation of Ferrite-Austenite Based Alloy


Pag. 58-58

Marinescu Cornelia1, Munteanu Cornel1, Khoshnaw Fuad2, Tanasescu Speranta1
 
1 “Ilie Murgulescu” Institute of Physical Chemistry of the Romanian Academy,
2 School of Engineering and Sustainable Development, De Montfort University, Leicester, UK
 
Disponibil în IBN: 19 mai 2020


Rezumat

Duplex stainless steels (DSS) consist in a mixture of two phases: ferrite and austenite. DSS alloys are used at high service temperatures (about 800 °C) in severe corrosive conditions [1]. Austenitic steels have superior mechanical properties in comparison to ferritic while ferrite has higher resistance to pitting corrosion [2]. Alloying the two phases in mixture with other elements, results in a steel with a good combination of mechanical properties and corrosion resistence. High temperature thermodynamic data are important to determine the stability domain of the different phases that can appear during the technological process of the alloys fabrication. In this work the microstructural changes of duplex stainless steel type UNS S32760 F55 at heating were investigated and thermodynamic parameters in terms of enthalpy increments, heat capacity and thermodynamic function of entropy are reported. Scanning electron microscopy was used to investigate the microstructural changes. Enthalpy increments, HT- H298, of the sample were obtained employing a drop calorimeter in the isothermal regime using a SETARAM multi-detector high temperature calorimeter (MHTC-96). Thermal effects of the samples in dynamic regim were measured by a TG-DSC (thermogravimetry-differential scanning calorimetry) Setaram analyzer, in the temperature range from room temperature to 1300 °C. The appearance and formation process of the sigma phase are investigated. Once sigma phase is formed the austenitic phase starts to be formed. A value of 9.64 J · g−1 has been estimated for enthalpy variation of 70 % austenite transformation. This is in good agreement with value reported by Raju at all. [3] for ferrite to austenite transformation in 9Cr- steels.