Detailed Information on Publication Record

SVOBODOVÁ, Marie and Jiří SOPOUŠEK. Experimental and theoretical studies of bainitic creep-resisting T23 steel. In CALPHAD XXXVIII (May 17-22, 2009). 2009.

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TY  - CONF
ID  - 834372
AU  - Svobodová, Marie - Sopoušek, Jiří
PY  - 2009
TI  - Experimental and theoretical studies of bainitic creep-resisting T23 steel
KW  - CALPHAD
KW  - weld
KW  - phase diagram
KW  - steel
N2  - CALPHAD approach is a progressive tool of material engineering helping in a development of new advanced materials. Based on this approach, we can make phase diagram calculations and predictions, and simulate diffusion-controlled phase transformation, too. In a view of the application, these phase diagrams calculations play a significant role in a, i.e., prediction of thermal-induced structure changes in new materials supposed to be used for power industry. Furthermore, perhaps all structural parts of power plants are welded, so, if the operation temperature is achieving values above 500stC, the simulations of diffusion-controlled phase transformations occurring in so thermal loaded weld joints enable to predict their structure stability and then a service lifetime of all the structural part. One of those new materials supposed to be used for power industry is bainitic creep-resisting T23 steel, a modification of low-alloyed 2.25Cr-1Mo steel, containing Cr (2.25 wt.%), Mo (0.1 wt.%), C, V, Mn (each 0.2 wt.%), and B, N (each 0.006 wt.%). Moreover, T23 steel is alloyed with 1.6 wt.% of W and 0.04 wt.% of Nb. Due to addings, as-treated steel has an improved creep resistance, high elastic-plastic properties, and a good weldability. Therefore, T23 steel is said to be use for power components at operating conditions up to 600degC. Because of, considering a service lifetime of components, a necessary prediction of long-term structure, corrosion, and strength behaviour of the material, our research was focused on study of structure behaviour of T23 steel at long-term isothermal exposure at 650degC. In opposite to 100 000 hrs exposure at 600stC (maximum service temperature), the increased temperature allows to get same degraded structure of steel after already 10 000 hrs. The thermal-induced phase transformations of as-received, as-welded, and as-exposed T23 steel were predicted by using Thermo-Calc and DICTRA. At the same time, XRD analysis, light and electron microscopy, and Vickers hardness measurement were used.
ER  -

Basic information
Original name	Experimental and theoretical studies of bainitic creep-resisting T23 steel
Name in Czech	Experimentální a teoretická studie bainitických creepově odolných T23 ocelí
Name (in English)	Experimental and theoretical studies of bainitic creep-resisting T23 steel
Authors	SVOBODOVÁ, Marie (203 Czech Republic, guarantor) and Jiří SOPOUŠEK (203 Czech Republic, belonging to the institution).
Edition	CALPHAD XXXVIII (May 17-22, 2009), 2009.

Other information
Original language	Czech
Type of outcome	Conference abstract
Field of Study	10403 Physical chemistry
Country of publisher	Slovakia
Confidentiality degree	is not subject to a state or trade secret
RIV identification code	RIV/00216224:14310/09:00051151
Organization unit	Faculty of Science
Keywords (in Czech)	CALPHAD; svar; fázové diagramy; ocel
Keywords in English	CALPHAD; weld; phase diagram; steel
Tags	CALPHAD, IK, Phase diagram, rivok, steel, weld
Tags	International impact
Changed by	Changed by: prof. RNDr. Jiří Sopoušek, CSc., učo 2405. Changed: 7/2/2012 09:11.

Abstract
CALPHAD approach is a progressive tool of material engineering helping in a development of new advanced materials. Based on this approach, we can make phase diagram calculations and predictions, and simulate diffusion-controlled phase transformation, too. In a view of the application, these phase diagrams calculations play a significant role in a, i.e., prediction of thermal-induced structure changes in new materials supposed to be used for power industry. Furthermore, perhaps all structural parts of power plants are welded, so, if the operation temperature is achieving values above 500stC, the simulations of diffusion-controlled phase transformations occurring in so thermal loaded weld joints enable to predict their structure stability and then a service lifetime of all the structural part. One of those new materials supposed to be used for power industry is bainitic creep-resisting T23 steel, a modification of low-alloyed 2.25Cr-1Mo steel, containing Cr (2.25 wt.%), Mo (0.1 wt.%), C, V, Mn (each 0.2 wt.%), and B, N (each 0.006 wt.%). Moreover, T23 steel is alloyed with 1.6 wt.% of W and 0.04 wt.% of Nb. Due to addings, as-treated steel has an improved creep resistance, high elastic-plastic properties, and a good weldability. Therefore, T23 steel is said to be use for power components at operating conditions up to 600degC. Because of, considering a service lifetime of components, a necessary prediction of long-term structure, corrosion, and strength behaviour of the material, our research was focused on study of structure behaviour of T23 steel at long-term isothermal exposure at 650degC. In opposite to 100 000 hrs exposure at 600stC (maximum service temperature), the increased temperature allows to get same degraded structure of steel after already 10 000 hrs. The thermal-induced phase transformations of as-received, as-welded, and as-exposed T23 steel were predicted by using Thermo-Calc and DICTRA. At the same time, XRD analysis, light and electron microscopy, and Vickers hardness measurement were used.

Abstract

CALPHAD approach is a progressive tool of material engineering helping in a development of new advanced materials. Based on this approach, we can make phase diagram calculations and predictions, and simulate diffusion-controlled phase transformation, too. In a view of the application, these phase diagrams calculations play a significant role in a, i.e., prediction of thermal-induced structure changes in new materials supposed to be used for power industry. Furthermore, perhaps all structural parts of power plants are welded, so, if the operation temperature is achieving values above 500stC, the simulations of diffusion-controlled phase transformations occurring in so thermal loaded weld joints enable to predict their structure stability and then a service lifetime of all the structural part. One of those new materials supposed to be used for power industry is bainitic creep-resisting T23 steel, a modification of low-alloyed 2.25Cr-1Mo steel, containing Cr (2.25 wt.%), Mo (0.1 wt.%), C, V, Mn (each 0.2 wt.%), and B, N (each 0.006 wt.%). Moreover, T23 steel is alloyed with 1.6 wt.% of W and 0.04 wt.% of Nb. Due to addings, as-treated steel has an improved creep resistance, high elastic-plastic properties, and a good weldability. Therefore, T23 steel is said to be use for power components at operating conditions up to 600degC. Because of, considering a service lifetime of components, a necessary prediction of long-term structure, corrosion, and strength behaviour of the material, our research was focused on study of structure behaviour of T23 steel at long-term isothermal exposure at 650degC. In opposite to 100 000 hrs exposure at 600stC (maximum service temperature), the increased temperature allows to get same degraded structure of steel after already 10 000 hrs. The thermal-induced phase transformations of as-received, as-welded, and as-exposed T23 steel were predicted by using Thermo-Calc and DICTRA. At the same time, XRD analysis, light and electron microscopy, and Vickers hardness measurement were used.

Abstract (in English)
CALPHAD approach is a progressive tool of material engineering helping in a development of new advanced materials. Based on this approach, we can make phase diagram calculations and predictions, and simulate diffusion-controlled phase transformation, too. In a view of the application, these phase diagrams calculations play a significant role in a, i.e., prediction of thermal-induced structure changes in new materials supposed to be used for power industry. Furthermore, perhaps all structural parts of power plants are welded, so, if the operation temperature is achieving values above 500stC, the simulations of diffusion-controlled phase transformations occurring in so thermal loaded weld joints enable to predict their structure stability and then a service lifetime of all the structural part. One of those new materials supposed to be used for power industry is bainitic creep-resisting T23 steel, a modification of low-alloyed 2.25Cr-1Mo steel, containing Cr (2.25 wt.%), Mo (0.1 wt.%), C, V, Mn (each 0.2 wt.%), and B, N (each 0.006 wt.%). Moreover, T23 steel is alloyed with 1.6 wt.% of W and 0.04 wt.% of Nb. Due to addings, as-treated steel has an improved creep resistance, high elastic-plastic properties, and a good weldability. Therefore, T23 steel is said to be use for power components at operating conditions up to 600degC. Because of, considering a service lifetime of components, a necessary prediction of long-term structure, corrosion, and strength behaviour of the material, our research was focused on study of structure behaviour of T23 steel at long-term isothermal exposure at 650degC. In opposite to 100 000 hrs exposure at 600stC (maximum service temperature), the increased temperature allows to get same degraded structure of steel after already 10 000 hrs. The thermal-induced phase transformations of as-received, as-welded, and as-exposed T23 steel were predicted by using Thermo-Calc and DICTRA. At the same time, XRD analysis, light and electron microscopy, and Vickers hardness measurement were used.

Abstract (in English)