Podrobný výpis o publikaci

HODIS, Zdeněk a Jiří SOPOUŠEK. CARBON AND NITROGEN ACTIVITIES OF MATERIALS OF WELD JOINTS. In IXth Seminar on diffusion and thermodynamics of materials. Brno: Institute of Physics of materials AS CR, 2006, s. 59. ISBN 80-239-7467-X.

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Základní údaje
Originální název	CARBON AND NITROGEN ACTIVITIES OF MATERIALS OF WELD JOINTS
Název česky	Aktivita uhlíku a dusíku v materiálech svarových spojů
Autoři	HODIS, Zdeněk (203 Česká republika) a Jiří SOPOUŠEK (203 Česká republika, garant).
Vydání	Brno, IXth Seminar on diffusion and thermodynamics of materials, s. 59-59, 2006.
Nakladatel	Institute of Physics of materials AS CR

Další údaje
Originální jazyk	angličtina
Typ výsledku	Stať ve sborníku
Obor	10403 Physical chemistry
Stát vydavatele	Česká republika
Utajení	není předmětem státního či obchodního tajemství
Kód RIV	RIV/00216224:14310/06:00018216
Organizační jednotka	Přírodovědecká fakulta
ISBN	80-239-7467-X
UT WoS	000246321900035
Klíčová slova anglicky	Equilibria;Calphad;DICTRA; weld;steel;heat-resistant
Štítky	CALPHAD, DICTRA, equilibria, heat-resistant, steel, weld
Příznaky	Mezinárodní význam
Změnil	Změnil: prof. RNDr. Jiří Sopoušek, CSc., učo 2405. Změněno: 9. 1. 2007 15:28.

Anotace
The demand for higher efficiency of energy production in fossil fired power stations goes to increasing of the working temperatures, which rich up to 625stC now. This limitation is given by creep properties of the materials used for steam turbines and the other parts under long high-temperature exploitation. The most widely used materials for this permanent services remain steels. From thermodynamic points of view, the steels can be thermodynamically treated as Fe-Me-N-C based closed systems where Me means metal elements (Cr, V, Mo, ...), N is nitrogen and C is carbon. Phase diagrams and temperature dependent carbon and nitrogen activities of the steels can be calculated using CALPHAD approach, which is based on semiempirical thermodynamic model of the multicomponent/multiphase system and thermodynamic condition of phase equilibrium. The activities of the all elements can be obtained during mathematical solution. In this contribution, the CALPHAD method is applied for an investigation of the heterogeneous welds, for baitic and martensitic base materials (P23, P24, P92 ..) and for electrodes and filler weld alloys (E911, VM12...). The results - calculated carbon and nitrogen activity temperature dependences are very important for a design of dissimilar weld joints.This information is essential, for example, for time-life estimations of the heterogeneous welds under high temperature creep.

Anotace

The demand for higher efficiency of energy production in fossil fired power stations goes to increasing of the working temperatures, which rich up to 625stC now. This limitation is given by creep properties of the materials used for steam turbines and the other parts under long high-temperature exploitation. The most widely used materials for this permanent services remain steels. From thermodynamic points of view, the steels can be thermodynamically treated as Fe-Me-N-C based closed systems where Me means metal elements (Cr, V, Mo, ...), N is nitrogen and C is carbon. Phase diagrams and temperature dependent carbon and nitrogen activities of the steels can be calculated using CALPHAD approach, which is based on semiempirical thermodynamic model of the multicomponent/multiphase system and thermodynamic condition of phase equilibrium. The activities of the all elements can be obtained during mathematical solution. In this contribution, the CALPHAD method is applied for an investigation of the heterogeneous welds, for baitic and martensitic base materials (P23, P24, P92 ..) and for electrodes and filler weld alloys (E911, VM12...). The results - calculated carbon and nitrogen activity temperature dependences are very important for a design of dissimilar weld joints.This information is essential, for example, for time-life estimations of the heterogeneous welds under high temperature creep.

Anotace česky
Aktivita uhlíku ve svarech pokročilých ocelích

Návaznosti
MSM0021622410, záměr	Název: Fyzikální a chemické vlastnosti pokročilých materiálů a struktur
MSM0021622410, záměr	Investor: Ministerstvo školství, mládeže a tělovýchovy ČR, Fyzikální a chemické vlastnosti pokročilých materiálů a struktur