The Experts below are selected from a list of 5028 Experts worldwide ranked by ideXlab platform
Rongqiao Wang - One of the best experts on this subject based on the ideXlab platform.
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effect of inclusions on low cycle fatigue lifetime in a powder metallurgy nickel based superalloy fgh96
International Journal of Fatigue, 2019Co-Authors: Dianyin Hu, Lihong Shang, Da Li, Tao Wang, Rongqiao WangAbstract:Abstract Powder metallurgy (P/M) nickel-based superalloy FGH96 is widely used for turbine discs in aero-engines. With an increasing trend towards powder metallurgy routes for turbine discs, undesired non-metallic inclusions comparable to the grain size are unavoidably introduced during the manufacturing process. In this study, a series of strain controlled low cycle fatigue (LCF) tests were conducted on the specimens cut from a P/M FGH96 turbine disc at elevated temperature. The microscopic mechanisms of the effects of the size and inclusion location on LCF lifetime were investigated by using scanning electronic microscope (SEM) with energy dispersive X-ray spectroscopy (EDS) for the fractographic analysis of specimens. It is revealed that the P/M FGH96 superalloy is sensitive to Surface defects, such as Surface Scratches and Surface inclusion; while the specimen for which the crack nucleates from internal inclusion usually has a longer fatigue lifetime due to smaller stress concentration at the crack tip. Moreover, the inclusion involving its location and size has a significant influence on the P/M FGH96 superalloy’s LCF lifetime. Then, a modified model was proposed to quantify the inclusion effect on the LCF lifetime. Finally, a probabilistic model based on Bayesian approach was formulated to describe the scattering in LCF lifetimes induced by random inclusions.
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effect of inclusions on low cycle fatigue lifetime in a powder metallurgy nickel based superalloy fgh96
International Journal of Fatigue, 2019Co-Authors: Dianyin Hu, Lihong Shang, Da Li, Tao Wang, Rongqiao WangAbstract:Abstract Powder metallurgy (P/M) nickel-based superalloy FGH96 is widely used for turbine discs in aero-engines. With an increasing trend towards powder metallurgy routes for turbine discs, undesired non-metallic inclusions comparable to the grain size are unavoidably introduced during the manufacturing process. In this study, a series of strain controlled low cycle fatigue (LCF) tests were conducted on the specimens cut from a P/M FGH96 turbine disc at elevated temperature. The microscopic mechanisms of the effects of the size and inclusion location on LCF lifetime were investigated by using scanning electronic microscope (SEM) with energy dispersive X-ray spectroscopy (EDS) for the fractographic analysis of specimens. It is revealed that the P/M FGH96 superalloy is sensitive to Surface defects, such as Surface Scratches and Surface inclusion; while the specimen for which the crack nucleates from internal inclusion usually has a longer fatigue lifetime due to smaller stress concentration at the crack tip. Moreover, the inclusion involving its location and size has a significant influence on the P/M FGH96 superalloy’s LCF lifetime. Then, a modified model was proposed to quantify the inclusion effect on the LCF lifetime. Finally, a probabilistic model based on Bayesian approach was formulated to describe the scattering in LCF lifetimes induced by random inclusions.
Shinichi Hirano - One of the best experts on this subject based on the ideXlab platform.
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ex situ evaluation of nanometer range gold coating on stainless steel substrate for automotive polymer electrolyte membrane fuel cell bipolar plate
Journal of Power Sources, 2010Co-Authors: A Kumar, Mark Stephen Ricketts, Shinichi HiranoAbstract:Abstract The bipolar plate in polymer electrolyte membrane (PEM) fuel cell helps to feed reactant gases to the membrane electrode assembly (MEA) and collect current from the MEA. To facilitate these functions, the bipolar plate material should exhibit excellent electrical conductivity and corrosion resistance under fuel cell operating conditions, and simultaneously be of low-cost to meet commercialization enabling targets for automotive fuel cells. In the present work, we focus on the benchmarking of 10 nm gold coated SS316L (a.k.a. Au Nanoclad ® ) bipolar plate material through ex situ tests, which is provided by Daido Steel (Japan). The use of nanometer range Au coatings help to retain the noble properties of gold while significantly reducing the cost of the bipolar plate. The area specific resistance of the flat sample is 0.9 mΩ cm 2 while that for the formed bipolar plate is 6.3 mΩ cm 2 at compaction force of 60 N cm −2 . The corrosion current density was less than 1 μA cm −2 at 0.8 V/NHE with air sparge simulating cathodic conditions. Additionally, gold coated SS316L showed anodic passivation of SS316L, thereby exhibiting robustness towards coating defects including Surface Scratches that may originate during the manufacturing of the bipolar plate. These series of ex situ tests indicate that 10 nm gold coated SS316L has good potential to be considered for commercial bipolar plates in automotive fuel cell stack.
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ex situ evaluation of nanometer range gold coating on stainless steel substrate for automotive polymer electrolyte membrane fuel cell bipolar plate
Journal of Power Sources, 2010Co-Authors: A Kumar, Mark Stephen Ricketts, Shinichi HiranoAbstract:Abstract The bipolar plate in polymer electrolyte membrane (PEM) fuel cell helps to feed reactant gases to the membrane electrode assembly (MEA) and collect current from the MEA. To facilitate these functions, the bipolar plate material should exhibit excellent electrical conductivity and corrosion resistance under fuel cell operating conditions, and simultaneously be of low-cost to meet commercialization enabling targets for automotive fuel cells. In the present work, we focus on the benchmarking of 10 nm gold coated SS316L (a.k.a. Au Nanoclad ® ) bipolar plate material through ex situ tests, which is provided by Daido Steel (Japan). The use of nanometer range Au coatings help to retain the noble properties of gold while significantly reducing the cost of the bipolar plate. The area specific resistance of the flat sample is 0.9 mΩ cm 2 while that for the formed bipolar plate is 6.3 mΩ cm 2 at compaction force of 60 N cm −2 . The corrosion current density was less than 1 μA cm −2 at 0.8 V/NHE with air sparge simulating cathodic conditions. Additionally, gold coated SS316L showed anodic passivation of SS316L, thereby exhibiting robustness towards coating defects including Surface Scratches that may originate during the manufacturing of the bipolar plate. These series of ex situ tests indicate that 10 nm gold coated SS316L has good potential to be considered for commercial bipolar plates in automotive fuel cell stack.
Dianyin Hu - One of the best experts on this subject based on the ideXlab platform.
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effect of inclusions on low cycle fatigue lifetime in a powder metallurgy nickel based superalloy fgh96
International Journal of Fatigue, 2019Co-Authors: Dianyin Hu, Lihong Shang, Da Li, Tao Wang, Rongqiao WangAbstract:Abstract Powder metallurgy (P/M) nickel-based superalloy FGH96 is widely used for turbine discs in aero-engines. With an increasing trend towards powder metallurgy routes for turbine discs, undesired non-metallic inclusions comparable to the grain size are unavoidably introduced during the manufacturing process. In this study, a series of strain controlled low cycle fatigue (LCF) tests were conducted on the specimens cut from a P/M FGH96 turbine disc at elevated temperature. The microscopic mechanisms of the effects of the size and inclusion location on LCF lifetime were investigated by using scanning electronic microscope (SEM) with energy dispersive X-ray spectroscopy (EDS) for the fractographic analysis of specimens. It is revealed that the P/M FGH96 superalloy is sensitive to Surface defects, such as Surface Scratches and Surface inclusion; while the specimen for which the crack nucleates from internal inclusion usually has a longer fatigue lifetime due to smaller stress concentration at the crack tip. Moreover, the inclusion involving its location and size has a significant influence on the P/M FGH96 superalloy’s LCF lifetime. Then, a modified model was proposed to quantify the inclusion effect on the LCF lifetime. Finally, a probabilistic model based on Bayesian approach was formulated to describe the scattering in LCF lifetimes induced by random inclusions.
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effect of inclusions on low cycle fatigue lifetime in a powder metallurgy nickel based superalloy fgh96
International Journal of Fatigue, 2019Co-Authors: Dianyin Hu, Lihong Shang, Da Li, Tao Wang, Rongqiao WangAbstract:Abstract Powder metallurgy (P/M) nickel-based superalloy FGH96 is widely used for turbine discs in aero-engines. With an increasing trend towards powder metallurgy routes for turbine discs, undesired non-metallic inclusions comparable to the grain size are unavoidably introduced during the manufacturing process. In this study, a series of strain controlled low cycle fatigue (LCF) tests were conducted on the specimens cut from a P/M FGH96 turbine disc at elevated temperature. The microscopic mechanisms of the effects of the size and inclusion location on LCF lifetime were investigated by using scanning electronic microscope (SEM) with energy dispersive X-ray spectroscopy (EDS) for the fractographic analysis of specimens. It is revealed that the P/M FGH96 superalloy is sensitive to Surface defects, such as Surface Scratches and Surface inclusion; while the specimen for which the crack nucleates from internal inclusion usually has a longer fatigue lifetime due to smaller stress concentration at the crack tip. Moreover, the inclusion involving its location and size has a significant influence on the P/M FGH96 superalloy’s LCF lifetime. Then, a modified model was proposed to quantify the inclusion effect on the LCF lifetime. Finally, a probabilistic model based on Bayesian approach was formulated to describe the scattering in LCF lifetimes induced by random inclusions.
A Kumar - One of the best experts on this subject based on the ideXlab platform.
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ex situ evaluation of nanometer range gold coating on stainless steel substrate for automotive polymer electrolyte membrane fuel cell bipolar plate
Journal of Power Sources, 2010Co-Authors: A Kumar, Mark Stephen Ricketts, Shinichi HiranoAbstract:Abstract The bipolar plate in polymer electrolyte membrane (PEM) fuel cell helps to feed reactant gases to the membrane electrode assembly (MEA) and collect current from the MEA. To facilitate these functions, the bipolar plate material should exhibit excellent electrical conductivity and corrosion resistance under fuel cell operating conditions, and simultaneously be of low-cost to meet commercialization enabling targets for automotive fuel cells. In the present work, we focus on the benchmarking of 10 nm gold coated SS316L (a.k.a. Au Nanoclad ® ) bipolar plate material through ex situ tests, which is provided by Daido Steel (Japan). The use of nanometer range Au coatings help to retain the noble properties of gold while significantly reducing the cost of the bipolar plate. The area specific resistance of the flat sample is 0.9 mΩ cm 2 while that for the formed bipolar plate is 6.3 mΩ cm 2 at compaction force of 60 N cm −2 . The corrosion current density was less than 1 μA cm −2 at 0.8 V/NHE with air sparge simulating cathodic conditions. Additionally, gold coated SS316L showed anodic passivation of SS316L, thereby exhibiting robustness towards coating defects including Surface Scratches that may originate during the manufacturing of the bipolar plate. These series of ex situ tests indicate that 10 nm gold coated SS316L has good potential to be considered for commercial bipolar plates in automotive fuel cell stack.
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ex situ evaluation of nanometer range gold coating on stainless steel substrate for automotive polymer electrolyte membrane fuel cell bipolar plate
Journal of Power Sources, 2010Co-Authors: A Kumar, Mark Stephen Ricketts, Shinichi HiranoAbstract:Abstract The bipolar plate in polymer electrolyte membrane (PEM) fuel cell helps to feed reactant gases to the membrane electrode assembly (MEA) and collect current from the MEA. To facilitate these functions, the bipolar plate material should exhibit excellent electrical conductivity and corrosion resistance under fuel cell operating conditions, and simultaneously be of low-cost to meet commercialization enabling targets for automotive fuel cells. In the present work, we focus on the benchmarking of 10 nm gold coated SS316L (a.k.a. Au Nanoclad ® ) bipolar plate material through ex situ tests, which is provided by Daido Steel (Japan). The use of nanometer range Au coatings help to retain the noble properties of gold while significantly reducing the cost of the bipolar plate. The area specific resistance of the flat sample is 0.9 mΩ cm 2 while that for the formed bipolar plate is 6.3 mΩ cm 2 at compaction force of 60 N cm −2 . The corrosion current density was less than 1 μA cm −2 at 0.8 V/NHE with air sparge simulating cathodic conditions. Additionally, gold coated SS316L showed anodic passivation of SS316L, thereby exhibiting robustness towards coating defects including Surface Scratches that may originate during the manufacturing of the bipolar plate. These series of ex situ tests indicate that 10 nm gold coated SS316L has good potential to be considered for commercial bipolar plates in automotive fuel cell stack.
Tao Wang - One of the best experts on this subject based on the ideXlab platform.
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effect of inclusions on low cycle fatigue lifetime in a powder metallurgy nickel based superalloy fgh96
International Journal of Fatigue, 2019Co-Authors: Dianyin Hu, Lihong Shang, Da Li, Tao Wang, Rongqiao WangAbstract:Abstract Powder metallurgy (P/M) nickel-based superalloy FGH96 is widely used for turbine discs in aero-engines. With an increasing trend towards powder metallurgy routes for turbine discs, undesired non-metallic inclusions comparable to the grain size are unavoidably introduced during the manufacturing process. In this study, a series of strain controlled low cycle fatigue (LCF) tests were conducted on the specimens cut from a P/M FGH96 turbine disc at elevated temperature. The microscopic mechanisms of the effects of the size and inclusion location on LCF lifetime were investigated by using scanning electronic microscope (SEM) with energy dispersive X-ray spectroscopy (EDS) for the fractographic analysis of specimens. It is revealed that the P/M FGH96 superalloy is sensitive to Surface defects, such as Surface Scratches and Surface inclusion; while the specimen for which the crack nucleates from internal inclusion usually has a longer fatigue lifetime due to smaller stress concentration at the crack tip. Moreover, the inclusion involving its location and size has a significant influence on the P/M FGH96 superalloy’s LCF lifetime. Then, a modified model was proposed to quantify the inclusion effect on the LCF lifetime. Finally, a probabilistic model based on Bayesian approach was formulated to describe the scattering in LCF lifetimes induced by random inclusions.
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effect of inclusions on low cycle fatigue lifetime in a powder metallurgy nickel based superalloy fgh96
International Journal of Fatigue, 2019Co-Authors: Dianyin Hu, Lihong Shang, Da Li, Tao Wang, Rongqiao WangAbstract:Abstract Powder metallurgy (P/M) nickel-based superalloy FGH96 is widely used for turbine discs in aero-engines. With an increasing trend towards powder metallurgy routes for turbine discs, undesired non-metallic inclusions comparable to the grain size are unavoidably introduced during the manufacturing process. In this study, a series of strain controlled low cycle fatigue (LCF) tests were conducted on the specimens cut from a P/M FGH96 turbine disc at elevated temperature. The microscopic mechanisms of the effects of the size and inclusion location on LCF lifetime were investigated by using scanning electronic microscope (SEM) with energy dispersive X-ray spectroscopy (EDS) for the fractographic analysis of specimens. It is revealed that the P/M FGH96 superalloy is sensitive to Surface defects, such as Surface Scratches and Surface inclusion; while the specimen for which the crack nucleates from internal inclusion usually has a longer fatigue lifetime due to smaller stress concentration at the crack tip. Moreover, the inclusion involving its location and size has a significant influence on the P/M FGH96 superalloy’s LCF lifetime. Then, a modified model was proposed to quantify the inclusion effect on the LCF lifetime. Finally, a probabilistic model based on Bayesian approach was formulated to describe the scattering in LCF lifetimes induced by random inclusions.
