The Experts below are selected from a list of 207 Experts worldwide ranked by ideXlab platform
Guocai Chai - One of the best experts on this subject based on the ideXlab platform.
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Sanicro 25: An advanced high-strength, Heat-Resistant austenitic stainless steel. An advanced high-strength, Heat-Resistant austenitic stainless steel
Materials for Ultra-Supercritical and Advanced Ultra-Supercritical Power Plants, 2016Co-Authors: Guocai Chai, ULF FORSBERGAbstract:Sandvik Sanicro 25 is a newly developed advanced Heat-Resistant Material for use in coal-fired boilers at Material temperatures up to 700°C. This new grade has recently obtained two AMSE code cases. It shows good resistance to steam oxidation and flue gas corrosion, and it has higher creep rupture strength than other austenitic stainless steels available today. This chapter will mainly focus on the characterization of long-term structure stability and performances, such as creep behaviors at different temperatures for more than 86,000. h, low-cycle fatigue behaviors at high temperatures, steam oxidation and hot corrosion, fabricability, and weldability. Some mechanisms are also discussed. The conclusion of this review is that the Sanicro 25 is an excellent candidate for superheaters and reheaters in high-efficient coal-fired boilers, ie, for applications seeing up to 700°C Material temperature.
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Creep Behavior in A Newly Developed Heat Resistant Austenitic Stainless Steel
BHM Berg- und Hüttenmännische Monatshefte, 2015Co-Authors: Guocai Chai, Johan Hernblom, Timo Peltola, Urban ForsbergAbstract:UNS S31035, ein hitzebeständiger austenitischer nichtrostender Stahl, setzt neue Maßstäbe für den Einsatz in mit kohlebefeuerten Dampferzeugern für Materialtemperaturen bis 700 °C. Der neue Werkstoff, welcher für zwei ASME Code Case zugelassen ist, zeichnet sich durch gute Beständigkeit gegen Dampf- und Rauchgaskorrosion sowie eine hohe Zeitstandfestigkeit aus. Diese Veröffentlichung legt den Schwerpunkt auf das Langzeitverhalten (bis 68000 h), charakterisiert durch Strukturstabilität und das Kriechverhalten bei unterschiedlichen Temperaturen. Die Kriechversagensmechanismen wurden mittels Transmission Electron Microscope (TEM), Electron Back Scatter Diffraction (EBSD) und Electron Channelling Contrast Image (ECCI) untersucht. Die Ergebnisse zeigen einen Zusammenhang zwischen Zeitstandfestigkeit und intergranularen Ausscheidungen sowie die Behinderung von Versetzungsbewegungen durch Nanoteilchen. Plastische Verformung und transkristalline Brüche sind die Hauptausfallmechanismen der untersuchten Zeitstandproben aus UNS S31035. Der Werkstoff weist eine gute Kriechduktilität durch Zwillingsbildung während des Zeitstandversuchs auf. UNS S31035 wurde in mehreren Europäischen Kohlekraftwerken installiert und getestet und zeigte eine gute Performance. UNS S3105 ist eine hervorragende Alternative für Überhitzer und Zwischenüberhitzer in hocheffizienten Dampferzeugern für Design-Materialtemperaturen bis zu 700 °C, als Alternative zu heute verwendeten Nickelbasislegierungen. UNS S31035 austenitic stainless steel grade is a newly developed advanced heat resistant Material for use in coal fired boilers at metal temperatures up to 700 °C. This new grade that has recently got two AMSE code cases shows good resistance to steam oxidation and flue gas corrosion and high creep rupture strength. This paper will mainly focus on the characterization of long term structure stability and performances such as the creep behaviors at different temperatures for up to 86,000 h at high temperatures. The creep damage mechanisms were studied using electron transmission microscopy, electron backscatter diffraction, and electron channeling contrast image analysis. The results show that the creep strength is related to the intragranular nano particles that act as obstacles for dislocation movements. Plastic deformation and transgranular fracture is the main creep fracture mechanism in the creep test samples of UNS S31035. The Material has good creep ductility by formation of twins during the creep test. This Material has been installed and tested in several European power plants, and has shown good performance. The Material is an excellent alternative for superheaters and reheaters in future high-efficient coal fired boilers with design Material temperatures up to 700 °C, instead of more costly nickel based alloy.
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Creep Behavior of the Newly Developed Advanced Heat Resistant Austenitic Stainless Steel Grade UNS S31035
ASME 2010 Pressure Vessels and Piping Conference: Volume 6 Parts A and B, 2010Co-Authors: Jan Högberg, Patrik Kjellström, Magnus Boström, Urban Forsberg, Guocai Chai, Rolf SandströmAbstract:The UNS S31035 austenitic stainless steel grade is a newly developed advanced heat resistant Material for use in coal fired boilers at Material temperatures up to about 700°C. This new grade has good resistance to oxidation and hot corrosion, and shows higher creep rupture strength than other austenitic stainless steels available today. This paper will mainly focus on the study of the creep mechanisms in this grade from 550?C up to 800°C by using TEM, SEM and LOM. the creep mechanisms at different temperatures and loading conditions have been identified. the interaction between dislocations and precipitates and their contribution on the creep rupture strength and fracture mechanisms have been discussed. In this paper, different models have been used to evaluate the long term creep behavior of the grade. A creep rupture strength near 100MPa at 700°C for 100 000h has been predicted. This makes it an interesting alternative for super-heaters and reheaters in future high-efficient coal fired boilers.Copyright © 2010 by ASME.
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Creep Behavior of the Newly Developed Advanced Heat Resistant Austenitic Stainless Steel Grade UNS S31035
ASME 2010 Pressure Vessels and Piping Conference: Volume 6 Parts A and B, 2010Co-Authors: Jan Högberg, Urban Forsberg, Guocai Chai, Patrik Kjellström, Magnus Boström, Rolf SandströmAbstract:The UNS S31035 austenitic stainless steel grade is a newly developed advanced heat resistant Material for use in coal fired boilers at Material temperatures up to about 700°C. This new grade has go ...
Jialing Yang - One of the best experts on this subject based on the ideXlab platform.
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Insulation Performance of Heat-Resistant Material for High-Speed Aircraft Under Thermal Environments
Journal of Materials Engineering and Performance, 2015Co-Authors: Dafang Wu, Yuewu Wang, Jialing YangAbstract:Lightweight insulation Materials are widely used to thermally protect high-speed aircraft, such as missiles. Thermal conductivity is an important parameter used to evaluate the efficiency of a Material’s thermal insulation performance. Since thermal conductivities provided from Material handbooks or manufacturers are discrete data for different temperature ranges, there is a deviation between those and actual parameters in terms of continuous nonlinear variations. Therefore, this study measures the thermal conductivities of lightweight thermal insulation Materials at high temperatures, and the relationship between the thermal conductivity and temperature is obtained. A finite element model of the thermal insulation Materials is also established and applied to numerically calculate the thermal insulation properties for high-temperature ceramic fiber insulation Materials using the experimentally obtained nonlinear relationship between thermal conductivity and temperature. Additionally, a transient aerodynamic heating experiment simulation system is used to thermally test the same Materials; the calculated and experimental results for the same Materials are compared, which exhibit good consistency that demonstrates that accurate results can be obtained from the numerical computation using the relationship established from the experimentally measured conductivity and temperature.
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Insulation Performance of Heat-Resistant Material for High-Speed Aircraft Under Thermal Environments
Journal of Materials Engineering and Performance, 2015Co-Authors: Dafang Wu, Zhentong Gao, Yuewu Wang, Jialing YangAbstract:© 2015, ASM International. Lightweight insulation Materials are widely used to thermally protect high-speed aircraft, such as missiles. Thermal conductivity is an important parameter used to evaluate the efficiency of a Material’s thermal insulation performance. Since thermal conductivities provided from Material handbooks or manufacturers are discrete data for different temperature ranges, there is a deviation between those and actual parameters in terms of continuous nonlinear variations. Therefore, this study measures the thermal conductivities of lightweight thermal insulation Materials at high temperatures, and the relationship between the thermal conductivity and temperature is obtained. A finite element model of the thermal insulation Materials is also established and applied to numerically calculate the thermal insulation properties for high-temperature ceramic fiber insulation Materials using the experimentally obtained nonlinear relationship between thermal conductivity and temperature. Additionally, a transient aerodynamic heating experiment simulation system is used to thermally test the same Materials; the calculated and experimental results for the same Materials are compared, which exhibit good consistency that demonstrates that accurate results can be obtained from the numerical computation using the relationship established from the experimentally measured conductivity and temperature.
ULF FORSBERG - One of the best experts on this subject based on the ideXlab platform.
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Sanicro 25: An advanced high-strength, Heat-Resistant austenitic stainless steel. An advanced high-strength, Heat-Resistant austenitic stainless steel
Materials for Ultra-Supercritical and Advanced Ultra-Supercritical Power Plants, 2016Co-Authors: Guocai Chai, ULF FORSBERGAbstract:Sandvik Sanicro 25 is a newly developed advanced Heat-Resistant Material for use in coal-fired boilers at Material temperatures up to 700°C. This new grade has recently obtained two AMSE code cases. It shows good resistance to steam oxidation and flue gas corrosion, and it has higher creep rupture strength than other austenitic stainless steels available today. This chapter will mainly focus on the characterization of long-term structure stability and performances, such as creep behaviors at different temperatures for more than 86,000. h, low-cycle fatigue behaviors at high temperatures, steam oxidation and hot corrosion, fabricability, and weldability. Some mechanisms are also discussed. The conclusion of this review is that the Sanicro 25 is an excellent candidate for superheaters and reheaters in high-efficient coal-fired boilers, ie, for applications seeing up to 700°C Material temperature.
Dafang Wu - One of the best experts on this subject based on the ideXlab platform.
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Insulation Performance of Heat-Resistant Material for High-Speed Aircraft Under Thermal Environments
Journal of Materials Engineering and Performance, 2015Co-Authors: Dafang Wu, Yuewu Wang, Jialing YangAbstract:Lightweight insulation Materials are widely used to thermally protect high-speed aircraft, such as missiles. Thermal conductivity is an important parameter used to evaluate the efficiency of a Material’s thermal insulation performance. Since thermal conductivities provided from Material handbooks or manufacturers are discrete data for different temperature ranges, there is a deviation between those and actual parameters in terms of continuous nonlinear variations. Therefore, this study measures the thermal conductivities of lightweight thermal insulation Materials at high temperatures, and the relationship between the thermal conductivity and temperature is obtained. A finite element model of the thermal insulation Materials is also established and applied to numerically calculate the thermal insulation properties for high-temperature ceramic fiber insulation Materials using the experimentally obtained nonlinear relationship between thermal conductivity and temperature. Additionally, a transient aerodynamic heating experiment simulation system is used to thermally test the same Materials; the calculated and experimental results for the same Materials are compared, which exhibit good consistency that demonstrates that accurate results can be obtained from the numerical computation using the relationship established from the experimentally measured conductivity and temperature.
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Insulation Performance of Heat-Resistant Material for High-Speed Aircraft Under Thermal Environments
Journal of Materials Engineering and Performance, 2015Co-Authors: Dafang Wu, Zhentong Gao, Yuewu Wang, Jialing YangAbstract:© 2015, ASM International. Lightweight insulation Materials are widely used to thermally protect high-speed aircraft, such as missiles. Thermal conductivity is an important parameter used to evaluate the efficiency of a Material’s thermal insulation performance. Since thermal conductivities provided from Material handbooks or manufacturers are discrete data for different temperature ranges, there is a deviation between those and actual parameters in terms of continuous nonlinear variations. Therefore, this study measures the thermal conductivities of lightweight thermal insulation Materials at high temperatures, and the relationship between the thermal conductivity and temperature is obtained. A finite element model of the thermal insulation Materials is also established and applied to numerically calculate the thermal insulation properties for high-temperature ceramic fiber insulation Materials using the experimentally obtained nonlinear relationship between thermal conductivity and temperature. Additionally, a transient aerodynamic heating experiment simulation system is used to thermally test the same Materials; the calculated and experimental results for the same Materials are compared, which exhibit good consistency that demonstrates that accurate results can be obtained from the numerical computation using the relationship established from the experimentally measured conductivity and temperature.
Urban Forsberg - One of the best experts on this subject based on the ideXlab platform.
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Creep Behavior in A Newly Developed Heat Resistant Austenitic Stainless Steel
BHM Berg- und Hüttenmännische Monatshefte, 2015Co-Authors: Guocai Chai, Johan Hernblom, Timo Peltola, Urban ForsbergAbstract:UNS S31035, ein hitzebeständiger austenitischer nichtrostender Stahl, setzt neue Maßstäbe für den Einsatz in mit kohlebefeuerten Dampferzeugern für Materialtemperaturen bis 700 °C. Der neue Werkstoff, welcher für zwei ASME Code Case zugelassen ist, zeichnet sich durch gute Beständigkeit gegen Dampf- und Rauchgaskorrosion sowie eine hohe Zeitstandfestigkeit aus. Diese Veröffentlichung legt den Schwerpunkt auf das Langzeitverhalten (bis 68000 h), charakterisiert durch Strukturstabilität und das Kriechverhalten bei unterschiedlichen Temperaturen. Die Kriechversagensmechanismen wurden mittels Transmission Electron Microscope (TEM), Electron Back Scatter Diffraction (EBSD) und Electron Channelling Contrast Image (ECCI) untersucht. Die Ergebnisse zeigen einen Zusammenhang zwischen Zeitstandfestigkeit und intergranularen Ausscheidungen sowie die Behinderung von Versetzungsbewegungen durch Nanoteilchen. Plastische Verformung und transkristalline Brüche sind die Hauptausfallmechanismen der untersuchten Zeitstandproben aus UNS S31035. Der Werkstoff weist eine gute Kriechduktilität durch Zwillingsbildung während des Zeitstandversuchs auf. UNS S31035 wurde in mehreren Europäischen Kohlekraftwerken installiert und getestet und zeigte eine gute Performance. UNS S3105 ist eine hervorragende Alternative für Überhitzer und Zwischenüberhitzer in hocheffizienten Dampferzeugern für Design-Materialtemperaturen bis zu 700 °C, als Alternative zu heute verwendeten Nickelbasislegierungen. UNS S31035 austenitic stainless steel grade is a newly developed advanced heat resistant Material for use in coal fired boilers at metal temperatures up to 700 °C. This new grade that has recently got two AMSE code cases shows good resistance to steam oxidation and flue gas corrosion and high creep rupture strength. This paper will mainly focus on the characterization of long term structure stability and performances such as the creep behaviors at different temperatures for up to 86,000 h at high temperatures. The creep damage mechanisms were studied using electron transmission microscopy, electron backscatter diffraction, and electron channeling contrast image analysis. The results show that the creep strength is related to the intragranular nano particles that act as obstacles for dislocation movements. Plastic deformation and transgranular fracture is the main creep fracture mechanism in the creep test samples of UNS S31035. The Material has good creep ductility by formation of twins during the creep test. This Material has been installed and tested in several European power plants, and has shown good performance. The Material is an excellent alternative for superheaters and reheaters in future high-efficient coal fired boilers with design Material temperatures up to 700 °C, instead of more costly nickel based alloy.
-
Creep Behavior of the Newly Developed Advanced Heat Resistant Austenitic Stainless Steel Grade UNS S31035
ASME 2010 Pressure Vessels and Piping Conference: Volume 6 Parts A and B, 2010Co-Authors: Jan Högberg, Patrik Kjellström, Magnus Boström, Urban Forsberg, Guocai Chai, Rolf SandströmAbstract:The UNS S31035 austenitic stainless steel grade is a newly developed advanced heat resistant Material for use in coal fired boilers at Material temperatures up to about 700°C. This new grade has good resistance to oxidation and hot corrosion, and shows higher creep rupture strength than other austenitic stainless steels available today. This paper will mainly focus on the study of the creep mechanisms in this grade from 550?C up to 800°C by using TEM, SEM and LOM. the creep mechanisms at different temperatures and loading conditions have been identified. the interaction between dislocations and precipitates and their contribution on the creep rupture strength and fracture mechanisms have been discussed. In this paper, different models have been used to evaluate the long term creep behavior of the grade. A creep rupture strength near 100MPa at 700°C for 100 000h has been predicted. This makes it an interesting alternative for super-heaters and reheaters in future high-efficient coal fired boilers.Copyright © 2010 by ASME.
-
Creep Behavior of the Newly Developed Advanced Heat Resistant Austenitic Stainless Steel Grade UNS S31035
ASME 2010 Pressure Vessels and Piping Conference: Volume 6 Parts A and B, 2010Co-Authors: Jan Högberg, Urban Forsberg, Guocai Chai, Patrik Kjellström, Magnus Boström, Rolf SandströmAbstract:The UNS S31035 austenitic stainless steel grade is a newly developed advanced heat resistant Material for use in coal fired boilers at Material temperatures up to about 700°C. This new grade has go ...