Kinetics of Equilibrium State Setting in Superaustenitic Anticorrosion Steels

SVOBODA, Milan, Jan VŘEŠŤÁL and Jiří SOPOUŠEK. Kinetics of Equilibrium State Setting in Superaustenitic Anticorrosion Steels. In Thermodynamics of Alloys TOFA 2002. Roma: Universita di Roma "La Sapiensa", 2002, p. OR40, 1 pp.

Basic information

• Original name: Kinetics of Equilibrium State Setting in Superaustenitic Anticorrosion Steels
• Authors: SVOBODA, Milan (203 Czech Republic), Jan VŘEŠŤÁL (203 Czech Republic, guarantor) and Jiří SOPOUŠEK (203 Czech Republic).
• Edition: Roma, Thermodynamics of Alloys TOFA 2002, p. OR40, 1 pp. 2002.
• Publisher: Universita di Roma "La Sapiensa"

Other information

• Original language: English
• Type of outcome: Proceedings paper
• Field of Study: 10403 Physical chemistry
• Country of publisher: Italy
• Confidentiality degree: is not subject to a state or trade secret
• RIV identification code: RIV/00216224:14330/02:00006366
• Organization unit: Faculty of Informatics
• Keywords in English: ThernoCalc;phase;diffusion;CALPHAD
• Tags: CALPHAD, Diffusion, phase, ThernoCalc

Abstract

Superaustenitic steels are commonly used as corrosion resistant materials at higher temperatures. It is known, that the structure state of these materials is changed during long-term service, for the slow setting of equilibrium state. The NICROFER 3033 (33Cr, 31Ni, 1.7Mo, O.39N) and AVESTA 254 SMO (20Cr, 18Ni, 6.1Mo, 0.20N) were investigated. The preliminary results of structure analysis (metallography, electron microscopy, electron diffraction) after annealing 700oC/500 hrs. have shown [1], that grains of FCC-phase are still inhomogeneous in the NICROFER 3033 alloy. In the NICROFER 3033, the sigma-phase was detected, as calculated, in the AVESTA 254 SMO, sigma-phase was not found. Therefore, further annealing was performed and the results of structure analysis of mentioned anticorrosion superaustenitic steels after annealing 700oC/3188 hrs are presented. Experimental results are compared with calculated ones.

Links

• GA106/00/0174, research and development project: Name: Termodynamika rovnovážných stavů a kinetika fázových transformací v soustavách přechodových kovů s N a C

Investor: Czech Science Foundation, The thermodynamics of equilibrium states and kinetics of phase transformations in the transition metals based systems with N and C

• IBS2041105, research and development project: Name: Povrchy a rozhraní v konstrukčních materiálech - aplikace moderních technologií a počítačového modelování