The Experts below are selected from a list of 210 Experts worldwide ranked by ideXlab platform
Zhiyong Huang - One of the best experts on this subject based on the ideXlab platform.
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A low cycle fatigue model for low Carbon Manganese steel including the effect of dynamic strain aging
Materials Science and Engineering, 2015Co-Authors: Zhiyong Huang, Daniele Wagner, Qingyuan Wang, Muhammad Kashif Khan, Jeanlouis ChabocheAbstract:Carbon Manganese steel A48 (French standards) is used in steam generator pipes of the nuclear power plant where it is subjected to the cyclic thermal load. The Dynamic Strain Aging (DSA) influences the mechanical behavior of the steel in low cycle fatigue (LCF) at favourable temperature and strain rate. The peak stress of A48 steel experiences hardening–softening–hardening (HSH) evolution at 200°C and 0.4% s-1 strain rate in fatigue loading. In this study, isotropic and kinematic hardening rules with DSA effect have been modified. The HSH evolution of cyclic stress associated with cumulative plastic deformation has also been estimated.
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some metallurgical aspects of dynamic strain aging effect on the low cycle fatigue behavior of c mn steels
International Journal of Fatigue, 2015Co-Authors: Zhiyong Huang, Daniele Wagner, Claude BathiasAbstract:Abstract Carbon–Manganese steels and associated welds are commonly used, and sometimes to sustain loads in the Low Cycle Fatigue domain. Nevertheless, the metallurgy of these C–Mn steels is rather complex, due to the interaction of solute atoms (Carbon and nitrogen) with dislocations during deformation which leads to metallurgical instabilities: Luders strain, Static Strain Aging (SSA) and Dynamic Strain Aging (DSA). The DSA phenomenon is an interaction during the test between solute atoms and dislocations which are submitted to an supplementary anchorage if the temperature is sufficient to allow the diffusion of solute atoms leading to a discontinuous plastic deformation localized in bands associated with serrations on the stress–strain curve. In C–Mn, the temperature domain where the phenomenon is present is from 150 °C to 300 °C. If these metallurgical instabilities induce an increase in hardness, unfortunately they produce a decrease of ductility detrimental to components safety. The results of the DSA effect on LCF behavior in C–Mn and Low Alloyed steels reported in the literature are very confused and contradictories. In this study, two C–Mn steels with a different sensitivity to DSA are investigated in the Low Cycle fatigue domain. As reported from some authors, the fatigue life seems enhance or reduce in the temperature domain where the DSA is maximum, but the decrease of the strain rate always decreases the number of cycles to failure.
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dislocations gliding study by ir thermography in c mn steels with different solute atoms content in the gigacycle fatigue domain
Key Engineering Materials, 2015Co-Authors: Zhiyong Huang, Nicolas Ranc, Daniele WagnerAbstract:Tests were performed on two Carbon-Manganese steels (A42 and A48 steels, French standard) in the gigacycle fatigue domain thanks to a piezoelectric fatigue machine working at 20000Hz. During the tests, temperature recordings were achieved by an infrared camera for various stress amplitudes. The main difference between the two steels compositions was the aluminum content (0.045% for the A42 steel and 0.004% for the A48 steel), and the Carbon content (0.140% for the A 42 steel and 0.198% for the A48 steel). In the A48 steel, the few aluminum content induces a higher free content of solute nitrogen in the lattice. Mechanical spectroscopy tests were performed and gave qualitative results on the solute contents repartition in the lattice. The temperature increase recorded during the fatigue tests for the two steels are different at the beginning of the tests. The differences can be explained by the different repartition of the solute atoms which induces a different dislocation gliding between the two materials. At the end of the tests, the thermal recordings are similar and attributed to the evolution of the solute atoms repartition and the dislocation structure.
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effect of dynamic strain aging on isotropic hardening in low cycle fatigue for Carbon Manganese steel
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2014Co-Authors: Zhiyong Huang, Daniele Wagner, Jeanlouis Chaboche, Qingyuan Wang, Claude BathiasAbstract:Abstract Carbon–Manganese steel A48 (French standard) is used in steam generator pipes of nuclear reactor pressure vessels at high temperatures (about 200 °C). The steel is sensitive to dynamic strain aging in monotonic tensile test and low cycle fatigue test at certain temperature range and strain rate. Its isotropic hardening behavior observed from experiments has a hardening, softening and hardening evolution with the effect of dynamic strain aging. The isotropic hardening model is improved by coupling the dislocation and dynamic strain aging theory to describe the behavior of A48 at 200 °C.
Claude Bathias - One of the best experts on this subject based on the ideXlab platform.
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some metallurgical aspects of dynamic strain aging effect on the low cycle fatigue behavior of c mn steels
International Journal of Fatigue, 2015Co-Authors: Zhiyong Huang, Daniele Wagner, Claude BathiasAbstract:Abstract Carbon–Manganese steels and associated welds are commonly used, and sometimes to sustain loads in the Low Cycle Fatigue domain. Nevertheless, the metallurgy of these C–Mn steels is rather complex, due to the interaction of solute atoms (Carbon and nitrogen) with dislocations during deformation which leads to metallurgical instabilities: Luders strain, Static Strain Aging (SSA) and Dynamic Strain Aging (DSA). The DSA phenomenon is an interaction during the test between solute atoms and dislocations which are submitted to an supplementary anchorage if the temperature is sufficient to allow the diffusion of solute atoms leading to a discontinuous plastic deformation localized in bands associated with serrations on the stress–strain curve. In C–Mn, the temperature domain where the phenomenon is present is from 150 °C to 300 °C. If these metallurgical instabilities induce an increase in hardness, unfortunately they produce a decrease of ductility detrimental to components safety. The results of the DSA effect on LCF behavior in C–Mn and Low Alloyed steels reported in the literature are very confused and contradictories. In this study, two C–Mn steels with a different sensitivity to DSA are investigated in the Low Cycle fatigue domain. As reported from some authors, the fatigue life seems enhance or reduce in the temperature domain where the DSA is maximum, but the decrease of the strain rate always decreases the number of cycles to failure.
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effect of dynamic strain aging on isotropic hardening in low cycle fatigue for Carbon Manganese steel
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2014Co-Authors: Zhiyong Huang, Daniele Wagner, Jeanlouis Chaboche, Qingyuan Wang, Claude BathiasAbstract:Abstract Carbon–Manganese steel A48 (French standard) is used in steam generator pipes of nuclear reactor pressure vessels at high temperatures (about 200 °C). The steel is sensitive to dynamic strain aging in monotonic tensile test and low cycle fatigue test at certain temperature range and strain rate. Its isotropic hardening behavior observed from experiments has a hardening, softening and hardening evolution with the effect of dynamic strain aging. The isotropic hardening model is improved by coupling the dislocation and dynamic strain aging theory to describe the behavior of A48 at 200 °C.
Jeanlouis Chaboche - One of the best experts on this subject based on the ideXlab platform.
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A low cycle fatigue model for low Carbon Manganese steel including the effect of dynamic strain aging
Materials Science and Engineering, 2015Co-Authors: Zhiyong Huang, Daniele Wagner, Qingyuan Wang, Muhammad Kashif Khan, Jeanlouis ChabocheAbstract:Carbon Manganese steel A48 (French standards) is used in steam generator pipes of the nuclear power plant where it is subjected to the cyclic thermal load. The Dynamic Strain Aging (DSA) influences the mechanical behavior of the steel in low cycle fatigue (LCF) at favourable temperature and strain rate. The peak stress of A48 steel experiences hardening–softening–hardening (HSH) evolution at 200°C and 0.4% s-1 strain rate in fatigue loading. In this study, isotropic and kinematic hardening rules with DSA effect have been modified. The HSH evolution of cyclic stress associated with cumulative plastic deformation has also been estimated.
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effect of dynamic strain aging on isotropic hardening in low cycle fatigue for Carbon Manganese steel
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2014Co-Authors: Zhiyong Huang, Daniele Wagner, Jeanlouis Chaboche, Qingyuan Wang, Claude BathiasAbstract:Abstract Carbon–Manganese steel A48 (French standard) is used in steam generator pipes of nuclear reactor pressure vessels at high temperatures (about 200 °C). The steel is sensitive to dynamic strain aging in monotonic tensile test and low cycle fatigue test at certain temperature range and strain rate. Its isotropic hardening behavior observed from experiments has a hardening, softening and hardening evolution with the effect of dynamic strain aging. The isotropic hardening model is improved by coupling the dislocation and dynamic strain aging theory to describe the behavior of A48 at 200 °C.
Daniele Wagner - One of the best experts on this subject based on the ideXlab platform.
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A low cycle fatigue model for low Carbon Manganese steel including the effect of dynamic strain aging
Materials Science and Engineering, 2015Co-Authors: Zhiyong Huang, Daniele Wagner, Qingyuan Wang, Muhammad Kashif Khan, Jeanlouis ChabocheAbstract:Carbon Manganese steel A48 (French standards) is used in steam generator pipes of the nuclear power plant where it is subjected to the cyclic thermal load. The Dynamic Strain Aging (DSA) influences the mechanical behavior of the steel in low cycle fatigue (LCF) at favourable temperature and strain rate. The peak stress of A48 steel experiences hardening–softening–hardening (HSH) evolution at 200°C and 0.4% s-1 strain rate in fatigue loading. In this study, isotropic and kinematic hardening rules with DSA effect have been modified. The HSH evolution of cyclic stress associated with cumulative plastic deformation has also been estimated.
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some metallurgical aspects of dynamic strain aging effect on the low cycle fatigue behavior of c mn steels
International Journal of Fatigue, 2015Co-Authors: Zhiyong Huang, Daniele Wagner, Claude BathiasAbstract:Abstract Carbon–Manganese steels and associated welds are commonly used, and sometimes to sustain loads in the Low Cycle Fatigue domain. Nevertheless, the metallurgy of these C–Mn steels is rather complex, due to the interaction of solute atoms (Carbon and nitrogen) with dislocations during deformation which leads to metallurgical instabilities: Luders strain, Static Strain Aging (SSA) and Dynamic Strain Aging (DSA). The DSA phenomenon is an interaction during the test between solute atoms and dislocations which are submitted to an supplementary anchorage if the temperature is sufficient to allow the diffusion of solute atoms leading to a discontinuous plastic deformation localized in bands associated with serrations on the stress–strain curve. In C–Mn, the temperature domain where the phenomenon is present is from 150 °C to 300 °C. If these metallurgical instabilities induce an increase in hardness, unfortunately they produce a decrease of ductility detrimental to components safety. The results of the DSA effect on LCF behavior in C–Mn and Low Alloyed steels reported in the literature are very confused and contradictories. In this study, two C–Mn steels with a different sensitivity to DSA are investigated in the Low Cycle fatigue domain. As reported from some authors, the fatigue life seems enhance or reduce in the temperature domain where the DSA is maximum, but the decrease of the strain rate always decreases the number of cycles to failure.
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dislocations gliding study by ir thermography in c mn steels with different solute atoms content in the gigacycle fatigue domain
Key Engineering Materials, 2015Co-Authors: Zhiyong Huang, Nicolas Ranc, Daniele WagnerAbstract:Tests were performed on two Carbon-Manganese steels (A42 and A48 steels, French standard) in the gigacycle fatigue domain thanks to a piezoelectric fatigue machine working at 20000Hz. During the tests, temperature recordings were achieved by an infrared camera for various stress amplitudes. The main difference between the two steels compositions was the aluminum content (0.045% for the A42 steel and 0.004% for the A48 steel), and the Carbon content (0.140% for the A 42 steel and 0.198% for the A48 steel). In the A48 steel, the few aluminum content induces a higher free content of solute nitrogen in the lattice. Mechanical spectroscopy tests were performed and gave qualitative results on the solute contents repartition in the lattice. The temperature increase recorded during the fatigue tests for the two steels are different at the beginning of the tests. The differences can be explained by the different repartition of the solute atoms which induces a different dislocation gliding between the two materials. At the end of the tests, the thermal recordings are similar and attributed to the evolution of the solute atoms repartition and the dislocation structure.
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effect of dynamic strain aging on isotropic hardening in low cycle fatigue for Carbon Manganese steel
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2014Co-Authors: Zhiyong Huang, Daniele Wagner, Jeanlouis Chaboche, Qingyuan Wang, Claude BathiasAbstract:Abstract Carbon–Manganese steel A48 (French standard) is used in steam generator pipes of nuclear reactor pressure vessels at high temperatures (about 200 °C). The steel is sensitive to dynamic strain aging in monotonic tensile test and low cycle fatigue test at certain temperature range and strain rate. Its isotropic hardening behavior observed from experiments has a hardening, softening and hardening evolution with the effect of dynamic strain aging. The isotropic hardening model is improved by coupling the dislocation and dynamic strain aging theory to describe the behavior of A48 at 200 °C.
Qingyuan Wang - One of the best experts on this subject based on the ideXlab platform.
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A low cycle fatigue model for low Carbon Manganese steel including the effect of dynamic strain aging
Materials Science and Engineering, 2015Co-Authors: Zhiyong Huang, Daniele Wagner, Qingyuan Wang, Muhammad Kashif Khan, Jeanlouis ChabocheAbstract:Carbon Manganese steel A48 (French standards) is used in steam generator pipes of the nuclear power plant where it is subjected to the cyclic thermal load. The Dynamic Strain Aging (DSA) influences the mechanical behavior of the steel in low cycle fatigue (LCF) at favourable temperature and strain rate. The peak stress of A48 steel experiences hardening–softening–hardening (HSH) evolution at 200°C and 0.4% s-1 strain rate in fatigue loading. In this study, isotropic and kinematic hardening rules with DSA effect have been modified. The HSH evolution of cyclic stress associated with cumulative plastic deformation has also been estimated.
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effect of dynamic strain aging on isotropic hardening in low cycle fatigue for Carbon Manganese steel
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2014Co-Authors: Zhiyong Huang, Daniele Wagner, Jeanlouis Chaboche, Qingyuan Wang, Claude BathiasAbstract:Abstract Carbon–Manganese steel A48 (French standard) is used in steam generator pipes of nuclear reactor pressure vessels at high temperatures (about 200 °C). The steel is sensitive to dynamic strain aging in monotonic tensile test and low cycle fatigue test at certain temperature range and strain rate. Its isotropic hardening behavior observed from experiments has a hardening, softening and hardening evolution with the effect of dynamic strain aging. The isotropic hardening model is improved by coupling the dislocation and dynamic strain aging theory to describe the behavior of A48 at 200 °C.