A three dimensional model including a non-rotational symmetry keyhole of which the geometry is calculated base on the energy balance at keyhole wall is created to simulate the heat transfer and fluid flow within the m...A three dimensional model including a non-rotational symmetry keyhole of which the geometry is calculated base on the energy balance at keyhole wall is created to simulate the heat transfer and fluid flow within the molten pool during laser full penetration welding of titanium alloy plate.In order to take into account the effects of multiple reflections within the keyhole,a ray tracing method is employed and the coordinate dependent heat flux obtained is exerted on keyhole wall during the simulation on the heat transfer and fluid flow within molten pool.Furthermore,the computed weld cross sectional profile is compared with the experimental result to verify the model and it is fond that the simulation result is consists with experimental result.展开更多
The effects of vapor incidence angle(VIA)on the microstructure and crystallographic texture of EB-PVD TBC under rotation mode have been experimentally examined by SEM,X-ray diffraction and pole figures in this article...The effects of vapor incidence angle(VIA)on the microstructure and crystallographic texture of EB-PVD TBC under rotation mode have been experimentally examined by SEM,X-ray diffraction and pole figures in this article.It is demonstrated that VIA strongly influences the angle of columnar grains and crystallographic texture of TBC.The inclination of columnar grains depends on the VIA and the inclination angle follows the tangent rule deposited at 900℃,but the inclination angle of columnar deposited at 800℃unconformity the tangent rule.展开更多
基金Foundation item:NSFC(No.50875200 and 50845011)Research Fund for the Doctoral Program of Higher Education of China(No.20090201120014 and 20070698088)Fundamental Research Funds for the Central Universities
文摘A three dimensional model including a non-rotational symmetry keyhole of which the geometry is calculated base on the energy balance at keyhole wall is created to simulate the heat transfer and fluid flow within the molten pool during laser full penetration welding of titanium alloy plate.In order to take into account the effects of multiple reflections within the keyhole,a ray tracing method is employed and the coordinate dependent heat flux obtained is exerted on keyhole wall during the simulation on the heat transfer and fluid flow within molten pool.Furthermore,the computed weld cross sectional profile is compared with the experimental result to verify the model and it is fond that the simulation result is consists with experimental result.
文摘The effects of vapor incidence angle(VIA)on the microstructure and crystallographic texture of EB-PVD TBC under rotation mode have been experimentally examined by SEM,X-ray diffraction and pole figures in this article.It is demonstrated that VIA strongly influences the angle of columnar grains and crystallographic texture of TBC.The inclination of columnar grains depends on the VIA and the inclination angle follows the tangent rule deposited at 900℃,but the inclination angle of columnar deposited at 800℃unconformity the tangent rule.
