Simulation of structural stability of weld joints of
heat-resistant steels.

D 2004

Simulation of structural stability of weld joints of heat-resistant steels.

SOPOUŠEK, Jiří, Rudolf FORET and Bronislav ZLÁMAL

Basic information

Original name

Simulation of structural stability of weld joints of heat-resistant steels.

Name in Czech

Simulace strukturní stability svarových spojů žárovzdorných ocelí.

Authors

SOPOUŠEK, Jiří (203 Czech Republic, guarantor), Rudolf FORET (203 Czech Republic) and Bronislav ZLÁMAL (203 Czech Republic)

Edition

Vienna, Thermodynamics of Alloys TOFA 2004, p. P28, 1 pp. 2004

Publisher

Dept. of Inorganic Chemistry, Materials Chemistry Group, Univ. of Vienna & Austrian Chemical Society

Other information

Language

English

Type of outcome

Stať ve sborníku

Field of Study

10403 Physical chemistry

Country of publisher

Austria

Confidentiality degree

není předmětem státního či obchodního tajemství

RIV identification code

RIV/00216224:14310/04:00011568

Organization unit

Faculty of Science

Keywords in English

DICTRA;phase;diffusion;CALPHAD

Abstract

ORIG CZ

V originále

Knowledge of microstructure stabilities is essential for reliable estimations of the lifetime limitations of materials and welded joints at higher temperatures. This information may be deduced from material phase diagrams and from heterogeneous weld joint simulations. The phase diagrams can be calculated using CALPHAD method [1]. This method complemented with appropriate diffusion approach [2], [3] can help us to simulate phase and element profile evolutions inside diffusion-affected zone of weld joint too. Thermodynamic database STEEL [4] and kinetic database DIF mentioned in [5] are used. The weld joints are simulated as heterogeneous diffusion couples. The results of the equilibrium calculations are presented as the phase diagram cross-sections of the selected materials: heat resistant steels and weld metals. The same equilibrium calculations offer element activities too. The carbon activity temperature dependences were calculated for individual materials. The observed difference between the carbon activities of two different materials (at given temperature) enabled us to predict diffusion flow direction, which can be in some cases opposite then deduced from carbon contents in some steel combinations (carbon up-hill diffusion). The simulations respect the coexistence of different carbide phases in the materials and they are conducted on the assumption that under the examined conditions the local phase equilibrium holds and that diffusion is the control process of phase transformation. The phase diagram calculations and diffusion couple simulations involving time-distance dependences for phase and element redistributions in diffusion-affected zones enabled us to obtain a basic information, which allow to estimate thermodynamic and diffusion stabilities of the studied materials and their weld joints and finally to deduce the weakest point(s) of the weld joins.

In Czech

Jsou vypočteny fázové diagramy metodou CALPHAD method za použití vytvořené termodynamické a kinetické databáze. Svarové spoje jsou simulovány jako difúzní páry. Z fázových a chemických simulovaných profilů je usuzováno na mikrostrukturu a mechanickou stabilitu spojení.

Links

GA106/03/0636, research and development project

Name: Teoretické modelování a experimentální studium strukturní stability moderních žárupevných ocelí a jejich svarů

Citovat

SOPOUŠEK, Jiří, Rudolf FORET and Bronislav ZLÁMAL. Simulation of structural stability of weld joints of heat-resistant steels. In Thermodynamics of Alloys TOFA 2004. Vienna: Dept. of Inorganic Chemistry, Materials Chemistry Group, Univ. of Vienna & Austrian Chemical Society, 2004, p. P28, 1 pp.

@inproceedings{557986,
   author = {Sopoušek, Jiří and Foret, Rudolf and Zlámal, Bronislav},
   address = {Vienna},
   booktitle = {Thermodynamics of Alloys TOFA 2004},
   keywords = {DICTRA;phase;diffusion;CALPHAD},
   language = {eng},
   location = {Vienna},
   pages = {P28},
   publisher = {Dept. of Inorganic Chemistry, Materials Chemistry Group, Univ. of Vienna & Austrian Chemical Society},
   title = {Simulation of structural stability of weld joints of heat-resistant steels.},
   year = {2004}
}

TY  - JOUR
ID  - 557986
AU  - Sopoušek, Jiří - Foret, Rudolf - Zlámal, Bronislav
PY  - 2004
TI  - Simulation of structural stability of weld joints of heat-resistant steels.
PB  - Dept. of Inorganic Chemistry, Materials Chemistry Group, Univ. of Vienna & Austrian Chemical Society
CY  - Vienna
KW  - DICTRA;phase;diffusion;CALPHAD
N2  - Knowledge of microstructure stabilities is essential for reliable estimations of the lifetime limitations of materials and welded joints at higher temperatures. This information may be deduced from material phase diagrams and from heterogeneous weld joint simulations. The phase diagrams can be calculated using CALPHAD method [1]. This method complemented with appropriate diffusion approach [2], [3] can help us to simulate phase and element profile evolutions inside diffusion-affected zone of weld joint too. Thermodynamic database STEEL [4] and kinetic database DIF mentioned in [5] are used. The weld joints are simulated as heterogeneous diffusion couples. The results of the equilibrium calculations are presented as the phase diagram cross-sections of the selected materials: heat resistant steels and weld metals. The same equilibrium calculations offer element activities too. The carbon activity temperature dependences were calculated for individual materials. The observed difference between the carbon activities of two different materials (at given temperature) enabled us to predict diffusion flow direction, which can be in some cases opposite then deduced from carbon contents in some steel combinations (carbon up-hill diffusion). The simulations respect the coexistence of different carbide phases in the materials and they are conducted on the assumption that under the examined conditions the local phase equilibrium holds and that diffusion is the control process of phase transformation. The phase diagram calculations and diffusion couple simulations involving time-distance dependences for phase and element redistributions in diffusion-affected zones enabled us to obtain a basic information, which allow to estimate thermodynamic and diffusion stabilities of the studied materials and their weld joints and finally to deduce the weakest point(s) of the weld joins.
ER  -

SOPOUŠEK, Jiří, Rudolf FORET and Bronislav ZLÁMAL. Simulation of structural stability of weld joints of heat-resistant steels. In \textit{Thermodynamics of Alloys TOFA 2004}. Vienna: Dept. of Inorganic Chemistry, Materials Chemistry Group, Univ. of Vienna \&{} Austrian Chemical Society, 2004, p.~P28, 1 pp.

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