CARBON AND NITROGEN REDISTRIBUTION IN WELD JOINTS OF HEAT RESISTANT STEELS
SOPOUŠEK, Jiří and Rudolf FORET. CARBON AND NITROGEN REDISTRIBUTION IN WELD JOINTS OF HEAT RESISTANT STEELS. In 1-st International Conference Super-High Strenght Steels. Roma: Associazione Italiana di Metallurgia, 2005, p. 60/1-9, 9 pp. ISBN 88-85298-56-7. |
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Basic information | |
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Original name | CARBON AND NITROGEN REDISTRIBUTION IN WELD JOINTS OF HEAT RESISTANT STEELS |
Name in Czech | Přerozdělení uhlíku a dusíku ve svarových spojích žárovzdorných ocelí |
Name (in English) | CARBON AND NITROGEN REDISTRIBUTION IN WELD JOINTS OF HEAT RESISTANT STEELS |
Authors | SOPOUŠEK, Jiří (203 Czech Republic, guarantor) and Rudolf FORET (203 Czech Republic). |
Edition | Roma, 1-st International Conference Super-High Strenght Steels, p. 60/1-9, 9 pp. 2005. |
Publisher | Associazione Italiana di Metallurgia |
Other information | |
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Original language | Czech |
Type of outcome | Proceedings paper |
Field of Study | 10403 Physical chemistry |
Country of publisher | Italy |
Confidentiality degree | is not subject to a state or trade secret |
RIV identification code | RIV/00216224:14310/05:00012734 |
Organization unit | Faculty of Science |
ISBN | 88-85298-56-7 |
Keywords in English | weldment;phase;DICTRA;CALPHAD;P91;carbonitride |
Tags | CALPHAD, carbonitride, DICTRA, P91, phase, weldment |
Changed by | Changed by: prof. RNDr. Jiří Sopoušek, CSc., učo 2405. Changed: 27/1/2006 16:07. |
Abstract |
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The present contribution deals with the theoretical modelling of the kinetics of the development of chemical composition and phase profiles of heterogeneous laboratory weld joints of heat resistant steels from the point of view of their long-term stability. The T25 ( 6 CrMoV 8-3-2) heat-resistant ferritic steel currently being developed and the advanced P91 (X10CrMoVNb 10-1) chromium steel, both steels after ion nitriding, homogenisation at 1050şC and weld joining were the subject of study. The basic compositions of materials were approximated as the Fe-Cr-Ni-Mo-V-C-N system. The long-term annealing of the T25+0.1129wt%N | P91+(0.8-0.064wt)N weld joints were simulated at 600şC and 900şC. The simulated results were compared with experimental carbon profile observations. The phase diagrams of the investigated materials were calculated using the CALPHAD approach [1] and applying the STEEL thermodynamic database [2]. The activities of carbon, nitrogen, and other elements were calculated by the same method. The CALPHAD approach complemented with an appropriate diffusion model [3] given in the DICTRA code enabled simulating the phase and element profile evolutions inside the diffusion-affected zone of weld joint. The DIF kinetic database [4] was used to describe the diffusion. In the simulation the coexistence of different phases (carbides, carbonitrides,) was assumed. |
Abstract (in English) |
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The present contribution deals with the theoretical modelling of the kinetics of the development of chemical composition and phase profiles of heterogeneous laboratory weld joints of heat resistant steels from the point of view of their long-term stability. The T25 ( 6 CrMoV 8-3-2) heat-resistant ferritic steel currently being developed and the advanced P91 (X10CrMoVNb 10-1) chromium steel, both steels after ion nitriding, homogenisation at 1050şC and weld joining were the subject of study. The basic compositions of materials were approximated as the Fe-Cr-Ni-Mo-V-C-N system. The long-term annealing of the T25+0.1129wt%N | P91+(0.8-0.064wt)N weld joints were simulated at 600şC and 900şC. The simulated results were compared with experimental carbon profile observations. The phase diagrams of the investigated materials were calculated using the CALPHAD approach [1] and applying the STEEL thermodynamic database [2]. The activities of carbon, nitrogen, and other elements were calculated by the same method. The CALPHAD approach complemented with an appropriate diffusion model [3] given in the DICTRA code enabled simulating the phase and element profile evolutions inside the diffusion-affected zone of weld joint. The DIF kinetic database [4] was used to describe the diffusion. In the simulation the coexistence of different phases (carbides, carbonitrides,) was assumed. |
Links | |
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GA106/03/0636, research and development project | Name: Teoretické modelování a experimentální studium strukturní stability moderních žárupevných ocelí a jejich svarů |
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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