|HODIS, Zdeněk and 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. p. 59. ISBN 80-239-7467-X.
|CARBON AND NITROGEN ACTIVITIES OF MATERIALS OF WELD JOINTS
|Name in Czech
|Aktivita uhlíku a dusíku v materiálech svarových spojů
|HODIS, Zdeněk (203 Czech Republic) and Jiří SOPOUŠEK (203 Czech Republic, guarantor).
| Brno, IXth Seminar on diffusion and thermodynamics of materials, p. 59-59, 2006.
|Institute of Physics of materials AS CR
|Type of outcome
|Field of Study
|10403 Physical chemistry
|Country of publisher
|is not subject to a state or trade secret
|RIV identification code
|Faculty of Science
|Keywords in English
|CALPHAD, DICTRA, equilibria, heat-resistant, steel, weld
|Changed by: prof. RNDr. Jiří Sopoušek, CSc., učo 2405. Changed: 9/1/2007 15:28.
|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.
|Abstract (in Czech)
|Aktivita uhlíku ve svarech pokročilých ocelích
|MSM0021622410, plan (intention)
|Name: Fyzikální a chemické vlastnosti pokročilých materiálů a struktur
|Investor: Ministry of Education, Youth and Sports of the CR, Physical and chemical properties of advanced materials and structures
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