CARBON AND NITROGEN ACTIVITIES OF MATERIALS OF WELD JOINTS

D 2006

CARBON AND NITROGEN ACTIVITIES OF MATERIALS OF WELD JOINTS

HODIS, Zdeněk and Jiří SOPOUŠEK

Basic information

Original name

CARBON AND NITROGEN ACTIVITIES OF MATERIALS OF WELD JOINTS

Name in Czech

Aktivita uhlíku a dusíku v materiálech svarových spojů

Authors

HODIS, Zdeněk (203 Czech Republic) and Jiří SOPOUŠEK (203 Czech Republic, guarantor)

Edition

Brno, IXth Seminar on diffusion and thermodynamics of materials, p. 59-59, 2006

Publisher

Institute of Physics of materials AS CR

Other information

Language

English

Type of outcome

Stať ve sborníku

Field of Study

10403 Physical chemistry

Country of publisher

Czech Republic

Confidentiality degree

není předmětem státního či obchodního tajemství

RIV identification code

RIV/00216224:14310/06:00018216

Organization unit

Faculty of Science

ISBN

80-239-7467-X

UT WoS

000246321900035

Keywords in English

Equilibria;Calphad;DICTRA; weld;steel;heat-resistant

Abstract

ORIG CZ

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.

In Czech

Aktivita uhlíku ve svarech pokročilých ocelích

Links

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

Citovat

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.

@inproceedings{708292,
   author = {Hodis, Zdeněk and Sopoušek, Jiří},
   address = {Brno},
   booktitle = {IXth Seminar on diffusion and thermodynamics of materials},
   keywords = {Equilibria;Calphad;DICTRA; weld;steel;heat-resistant},
   language = {eng},
   location = {Brno},
   isbn = {80-239-7467-X},
   pages = {59-59},
   publisher = {Institute of Physics of materials AS CR},
   title = {CARBON AND NITROGEN ACTIVITIES OF MATERIALS OF WELD JOINTS},
   year = {2006}
}

TY  - JOUR
ID  - 708292
AU  - Hodis, Zdeněk - Sopoušek, Jiří
PY  - 2006
TI  - CARBON AND NITROGEN ACTIVITIES OF MATERIALS OF WELD JOINTS
PB  - Institute of Physics of materials AS CR
CY  - Brno
SN  - 802397467X
KW  - Equilibria;Calphad;DICTRA
KW  - weld;steel;heat-resistant
N2  - 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.
ER  -

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

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