Microstructure of super-austenitic steels after long-term annealing

0354171 - ÚFM 2011 RIV DE eng J - Journal Article
Kraus, M. - Kroupa, Aleš - Miodownik, P. - Svoboda, Milan - Vřešťál, J.
Microstructure of super-austenitic steels after long-term annealing.
International Journal of Materials Research. Roč. 101, č. 6 (2010), s. 729-735. ISSN 1862-5282. E-ISSN 2195-8556
R&D Projects: GA ČR(CZ) GA106/07/1078
Institutional research plan: CEZ:AV0Z20410507
Keywords : phase equilibria * microstructure * super-austenitic steel
Subject RIV: BJ - Thermodynamics
Impact factor: 0.860, year: 2010

Longevity of materials, especially technological parts, is influenced by microstructure development during long-time annealing of such parts during their industrial service. Important relations between the volume fractions of phases and the time of service, especially the precipitation of intermetallics need to be revealed. The present study describes the time depedence of the structure development of two corrosion resistant steels with chromium content of 27 and 32 wt.% and various additions of nickel, molybdenum, manganese, silicon, copper and nitrogen. The microstructure was studied on samples annealed at 700oC for 500, 3188 and 6170 h, revealing the kinetics of the equilibrium process. The homogenity of samples was checked before heat treatment. The experimental microstructures are compared with the predicted phase composition. The effect of using different databases is also discussed.
Permanent Link: http://hdl.handle.net/11104/0193232