Severe plastic deformation of Ti-10V-2Fe-3Al alloy in the surface region was caused by shot peening at air pressure of 0.6 MPa with processing time ranging from 1 to 45 min.The results showed that the thickness of sur...Severe plastic deformation of Ti-10V-2Fe-3Al alloy in the surface region was caused by shot peening at air pressure of 0.6 MPa with processing time ranging from 1 to 45 min.The results showed that the thickness of surface deformation layer was proportio nal to the processing time,the microhardness of the shot-peened surface in creased from 280 to 385 HV,and the depth of highly hardening layers arrived at 200μm.It was worth noting that a grain size gradient from nanocrystalline on the surface toward coarse grain in the matrix was obtained during the shot peening process and the minimum grain size in the top surface after shot peening was about 100-200 nm.展开更多
Composite coating on GH4169 alloy is prepared by laser cladding yttria-stabilized zirconia(YSZ)@Ni core-shell powdersmixed with NiCoCrAlY alloy powders.The cyclic oxidation behavior of the coatings,especially the grow...Composite coating on GH4169 alloy is prepared by laser cladding yttria-stabilized zirconia(YSZ)@Ni core-shell powdersmixed with NiCoCrAlY alloy powders.The cyclic oxidation behavior of the coatings,especially the growth process of theoxide layer,is investigated based on experimental research and first-principle calculations.The results indicate that theoxidation resistance of coated GH4169 alloy is beer than that of uncoated GH4169 alloy.The coating has three layers:acellular dendrite outer layer,a planar YSZ interlayer,and an inner layer composed of Cr2O3 formed during laser clading.After oxidation at 1000 and 1050℃,as the oxidation time increases,the cellular dendrite outer layer becomes thicker,andthe planar yttria-stabilized zirconia interlayer becomes thinner.Between the planar interlayer and Cr2O3 inner layer,and Al2O3 layer formed.Notably,cracks formed in the intcrface of Al2O3/Cr2O3 owing to thcir weak interface strength,whichled to the failure of the composite coating.展开更多
基金the National Natural Science Foundation of China(Grant No.51361026)the Natural Science Foundation of Jiangxi Province(Grant No.20171BAB206006)+1 种基金the Key Project of Science and Technology Project of Jiangxi Provincial Education Department(Grant No.GJJ160678)Open Foundation of National Defense Key Discipline Laboratory of Light Alloy Processing Science and Technology,Nanchang Hangkong University(GF201501004).
文摘Severe plastic deformation of Ti-10V-2Fe-3Al alloy in the surface region was caused by shot peening at air pressure of 0.6 MPa with processing time ranging from 1 to 45 min.The results showed that the thickness of surface deformation layer was proportio nal to the processing time,the microhardness of the shot-peened surface in creased from 280 to 385 HV,and the depth of highly hardening layers arrived at 200μm.It was worth noting that a grain size gradient from nanocrystalline on the surface toward coarse grain in the matrix was obtained during the shot peening process and the minimum grain size in the top surface after shot peening was about 100-200 nm.
基金supported by the National Natural Science Foundation of China(Grant No.51361026)the Key Research and Development Plan of Jiangxi Province(Grant No.20181ACH80009)+3 种基金the China Postdoctoral Science Foundation(GrantNo.2017M620576)the Aeronautical Science Foundation of China(2017ZE56015)the Open Foundation of the State Key Laboratory of Refractories and Metallurgy(Wuhan University of Science and Technology)(Grant No.G201808)the Open Foundation of the State Key Laboratory of Advanced Refractories(Grant No.201806).
文摘Composite coating on GH4169 alloy is prepared by laser cladding yttria-stabilized zirconia(YSZ)@Ni core-shell powdersmixed with NiCoCrAlY alloy powders.The cyclic oxidation behavior of the coatings,especially the growth process of theoxide layer,is investigated based on experimental research and first-principle calculations.The results indicate that theoxidation resistance of coated GH4169 alloy is beer than that of uncoated GH4169 alloy.The coating has three layers:acellular dendrite outer layer,a planar YSZ interlayer,and an inner layer composed of Cr2O3 formed during laser clading.After oxidation at 1000 and 1050℃,as the oxidation time increases,the cellular dendrite outer layer becomes thicker,andthe planar yttria-stabilized zirconia interlayer becomes thinner.Between the planar interlayer and Cr2O3 inner layer,and Al2O3 layer formed.Notably,cracks formed in the intcrface of Al2O3/Cr2O3 owing to thcir weak interface strength,whichled to the failure of the composite coating.
