This paper discusses processing in-situ RZ5-10wt%TiC composite fabricated by self-propagating high temperature(S.H.S)method where RZ5 Mg alloy was the matrix and TiC as reinforcement.The purpose of this study is to im...This paper discusses processing in-situ RZ5-10wt%TiC composite fabricated by self-propagating high temperature(S.H.S)method where RZ5 Mg alloy was the matrix and TiC as reinforcement.The purpose of this study is to improve the mechanical properties and wear resistance of the RZ5 alloy used in aerospace application by adding TiC particles.The wear test was performed using pin-on-disc apparatus against 600 grit abrasive paper by varying the sliding distance and applied load.The composite was microstructurally characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM)and energy dispersive X-ray spectroscopy(EDS).The results exhibited that the tensile strength and hardness of the RZ5-10wt%TiC composite increased considerably while grain size decreased compare to the unreinforced RZ5 alloy.The SEM based fractography indicated mixed mode(quasi-cleavage and ductile feature)failure of the composite.展开更多
Welding sequence has a significant effect on distortion pattern of large orthogonally stiffened panels normally used in ships and offshore structures. These deformations adversely affect the subsequent fitup and align...Welding sequence has a significant effect on distortion pattern of large orthogonally stiffened panels normally used in ships and offshore structures. These deformations adversely affect the subsequent fitup and alignment of the adjacent panels. It may also result in loss of structural integrity. These panels primarily suffer from angular and buckling distortions. The extent of distortion depends on several parameters such as welding speed, plate thickness, welding current, voltage, restraints applied to the job while welding, thermal history as well as sequence of welding. Numerical modeling of welding and experimental validation of the FE model has been carried out for estimation of thermal history and resulting distortions. In the present work an FE model has been developed for studying the effect of welding sequence on the distortion pattern and its magnitude in fabrication of orthogonally stiffened plate panels.展开更多
文摘This paper discusses processing in-situ RZ5-10wt%TiC composite fabricated by self-propagating high temperature(S.H.S)method where RZ5 Mg alloy was the matrix and TiC as reinforcement.The purpose of this study is to improve the mechanical properties and wear resistance of the RZ5 alloy used in aerospace application by adding TiC particles.The wear test was performed using pin-on-disc apparatus against 600 grit abrasive paper by varying the sliding distance and applied load.The composite was microstructurally characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM)and energy dispersive X-ray spectroscopy(EDS).The results exhibited that the tensile strength and hardness of the RZ5-10wt%TiC composite increased considerably while grain size decreased compare to the unreinforced RZ5 alloy.The SEM based fractography indicated mixed mode(quasi-cleavage and ductile feature)failure of the composite.
文摘Welding sequence has a significant effect on distortion pattern of large orthogonally stiffened panels normally used in ships and offshore structures. These deformations adversely affect the subsequent fitup and alignment of the adjacent panels. It may also result in loss of structural integrity. These panels primarily suffer from angular and buckling distortions. The extent of distortion depends on several parameters such as welding speed, plate thickness, welding current, voltage, restraints applied to the job while welding, thermal history as well as sequence of welding. Numerical modeling of welding and experimental validation of the FE model has been carried out for estimation of thermal history and resulting distortions. In the present work an FE model has been developed for studying the effect of welding sequence on the distortion pattern and its magnitude in fabrication of orthogonally stiffened plate panels.
