2006
CARBON AND NITROGEN ACTIVITIES OF MATERIALS OF WELD JOINTS
HODIS, Zdeněk a Jiří SOPOUŠEKZákladní 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
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
Příznaky
Mezinárodní význam
Změněno: 9. 1. 2007 15:28, prof. RNDr. Jiří Sopoušek, CSc.
V originále
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.
Česky
Aktivita uhlíku ve svarech pokročilých ocelích
Návaznosti
MSM0021622410, záměr |
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