About: Phase changes in superaustenitic steels after long-term annealing

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	A structural study was performed on the austenitic steels Avesta 254 SMO and Avesta 654 SMO after annealing at 700 C for 500, 3188 and 6170 h. Both Avesta steels initially show an unexpectedly large amount of the Laves phase, followed by a relative slow development of the Sigma phase with equilibrium apparently not yet reached after 3188 h. Thermodynamic calculations confirm that the driving forces for alternative precipitates are very similar thus making it easy to form metastable precipitates that only change very slowly to the equilibrium state. TTT calculations also comnfirm that the Laves phase precipitates earlier than the Sigma phase as the temperature is lowered. A structural study was performed on the austenitic steels Avesta 254 SMO and Avesta 654 SMO after annealing at 700 C for 500, 3188 and 6170 h. Both Avesta steels initially show an unexpectedly large amount of the Laves phase, followed by a relative slow development of the Sigma phase with equilibrium apparently not yet reached after 3188 h. Thermodynamic calculations confirm that the driving forces for alternative precipitates are very similar thus making it easy to form metastable precipitates that only change very slowly to the equilibrium state. TTT calculations also comnfirm that the Laves phase precipitates earlier than the Sigma phase as the temperature is lowered. (en) Byla provedena studie struktury austenitických ocelí Avesta 254 SMO a Avesta 654 SMO po dlouhodobém žíhání při 700 C po dobu 500, 3188 a 6170 hodin. V obou typech ocelí precipituje z počátku nebývale velké množství Lavesovy fáze, následované později vývojem sigma fáze. Rovnováhy se zřejmě nedosáhne ani po 3188 hod. Termodynamické výpočty potvrzují, že hnací síly tvorby obou precipitátů jsou podobné a tedy se snadno tvoří metastabilní precipitáty, které se mění jen pomalu na rovnovážnou strukturu. Výpočty TTT-křivek také potvrdily, že Lavesova fáze precipituje dříve než sigma fáze, snížíme-li teplotu. (cs)
Title	Phase changes in superaustenitic steels after long-term annealing Phase changes in superaustenitic steels after long-term annealing (en) Fázové změny v superaustenitických ocelích po dlouhodobém žíhání (cs)
skos:prefLabel	Phase changes in superaustenitic steels after long-term annealing Phase changes in superaustenitic steels after long-term annealing (en) Fázové změny v superaustenitických ocelích po dlouhodobém žíhání (cs)
skos:notation	RIV/00216224:14310/04:00011935!RIV09-GA0-14310___
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(GA106/03/1354), Z(AV0Z2041904)
http://linked.open...iv/cisloPeriodika	11
http://linked.open...vai/riv/dodaniDat	2009
http://linked.open...aciTvurceVysledku	Vřešťál, Jan Svoboda, Milan Kroupa, Aleš Sopoušek, Jiří Miodownik, Peter
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Masarykova univerzita / Přírodovědecká fakulta
http://linked.open...dnocenehoVysledku	579310
http://linked.open...ai/riv/idVysledku	RIV/00216224:14310/04:00011935
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Austenitic steels; Microstructure; Thermodynamic modelling; Calphad method (en)
http://linked.open.../riv/klicoveSlovo	Thermodynamic modelling Austenitic steels Microstructure Calphad method
http://linked.open...odStatuVydavatele	GR - Řecká republika
http://linked.open...ontrolniKodProRIV	[BA82AEF207D9]
http://linked.open...i/riv/nazevZdroje	Zeitschrift fur Metallkunde
http://linked.open...in/vavai/riv/obor	CF
http://linked.open...ichTvurcuVysledku	5 (xsd:int)
http://linked.open...cetTvurcuVysledku	5 (xsd:int)
http://linked.open...vavai/riv/projekt	The thermodynamic modelling of the behaviour of important secondary phases based on transition metals in modern materials
http://linked.open...UplatneniVysledku	2004
http://linked.open...v/svazekPeriodika	95
http://linked.open...iv/tvurceVysledku	Kroupa, Aleš Sopoušek, Jiří Svoboda, Milan Vřešťál, Jan Miodownik, Peter
http://linked.open...ain/vavai/riv/wos	000225467400009
http://linked.open...n/vavai/riv/zamer	Behavior and properties of metallic and non-metallic materials in relation to their structure, research on processes leading to degradation of material quality
issn	0044-3093
number of pages	6 (xsd:int)
http://localhost/t...ganizacniJednotka	14310

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