In the present study, bond-coats for thermal barrier coatings were deposited via air plasma spraying（APS） techniques onto Inconel 800 and Hastelloy C-276 alloy substrates. Scanning electron microscopy（SEM）, transm...In the present study, bond-coats for thermal barrier coatings were deposited via air plasma spraying（APS） techniques onto Inconel 800 and Hastelloy C-276 alloy substrates. Scanning electron microscopy（SEM）, transmission electron microscopy（TEM）, X-ray diffraction（XRD）, and atomic force microscopy（AFM） were used to investigate the phases and microstructure of the as-sprayed, APS-deposited Co Ni Cr Al Y bond-coatings. The aim of this work was to study the suitability of the bond-coat materials for high temperature applications. Confirmation of nanoscale grains of the γ/γ′-phase was obtained by TEM, high-resolution TEM, and AFM. We concluded that these changes result from the plastic deformation of the bond-coat during the deposition, resulting in Co Ni Cr Al Y bond-coatings with excellent thermal cyclic resistance suitable for use in high-temperature applications. Cyclic oxidative stability was observed to also depend on the underlying metallic alloy substrate.展开更多
With the growing prominence of recycling projects of groundwater,the attention towards subsidence concerns in geological formations is intensifying.However,due to the long evolutionary time and complex underground dis...With the growing prominence of recycling projects of groundwater,the attention towards subsidence concerns in geological formations is intensifying.However,due to the long evolutionary time and complex underground discontinuities,the deformation field and subsidence mechanism are difficult to obtain.To this concern,this study implemented the Hydro-Mechanical Coupled Discontinuous Deformation Analysis(HM-DDA)in a groundwater recycling project located at a goaf mining site.The method for establishing numerical stratigraphic models and determining the required numerical parameters is introduced.This contributes to the comprehensive reconstruction of changes in in-situ stress within the goaf area,encompassing the initial stress equilibrium state,as well as the processes of water pumping and injection.The results indicated that the water injection process mitigated stress concentrations at both ends of the goaf area.Specifically,a 30-m rise in water head resulted in a corresponding elevation of the ground surface by 3.94 cm.展开更多
基金provided by Technical Education Quality Improvement Programme-Ⅱ(TEQIP-Ⅱ)at MNNIT Allahabad
文摘In the present study, bond-coats for thermal barrier coatings were deposited via air plasma spraying（APS） techniques onto Inconel 800 and Hastelloy C-276 alloy substrates. Scanning electron microscopy（SEM）, transmission electron microscopy（TEM）, X-ray diffraction（XRD）, and atomic force microscopy（AFM） were used to investigate the phases and microstructure of the as-sprayed, APS-deposited Co Ni Cr Al Y bond-coatings. The aim of this work was to study the suitability of the bond-coat materials for high temperature applications. Confirmation of nanoscale grains of the γ/γ′-phase was obtained by TEM, high-resolution TEM, and AFM. We concluded that these changes result from the plastic deformation of the bond-coat during the deposition, resulting in Co Ni Cr Al Y bond-coatings with excellent thermal cyclic resistance suitable for use in high-temperature applications. Cyclic oxidative stability was observed to also depend on the underlying metallic alloy substrate.
基金supported by China Scholarship Council(CSC,No.202108050072).
文摘With the growing prominence of recycling projects of groundwater,the attention towards subsidence concerns in geological formations is intensifying.However,due to the long evolutionary time and complex underground discontinuities,the deformation field and subsidence mechanism are difficult to obtain.To this concern,this study implemented the Hydro-Mechanical Coupled Discontinuous Deformation Analysis(HM-DDA)in a groundwater recycling project located at a goaf mining site.The method for establishing numerical stratigraphic models and determining the required numerical parameters is introduced.This contributes to the comprehensive reconstruction of changes in in-situ stress within the goaf area,encompassing the initial stress equilibrium state,as well as the processes of water pumping and injection.The results indicated that the water injection process mitigated stress concentrations at both ends of the goaf area.Specifically,a 30-m rise in water head resulted in a corresponding elevation of the ground surface by 3.94 cm.
