The Experts below are selected from a list of 276 Experts worldwide ranked by ideXlab platform
Luhai Wu - One of the best experts on this subject based on the ideXlab platform.
-
structure deformation and failure of Sintered Steel wire mesh under torsion loading
Materials & Design, 2009Co-Authors: Guo He, Luhai WuAbstract:Abstract Sintered Steel wire mesh materials with total porosities of 36.3–61.8%, which are subjected to torsion loading, have been investigated in terms of deformation mode and failure mechanism. The experiments reveal that the twisted wire’s stretching, moving and rotating are main deformation mode, which leads to most of wires orientating towards the torsion direction. The failure occurs when the oriented wires fracture continuously, and leave behind a 45° fracture surface. The shear strength and shear modulus of the tested wire mesh samples are evaluated in the range of 44–103 MPa and 47–718 MPa, respectively. With an increase in porosity both the shear strength and the shear modulus decrease.
-
fabrication of Sintered Steel wire mesh and its compressive properties
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2008Co-Authors: Guo He, Luhai WuAbstract:Abstract Porous Steel wire mesh with open porosities of 33.90–56.27% and pore sizes of 25–1300 μm has been prepared by metallurgical route. The porous morphologies and porosities of the wire mesh have been investigated in terms of forming pressure, sintering temperature and sintering holding time. The pore size distribution in the as-prepared samples has been determined by means of metallographic statistic measurement. The results indicate that the total and open porosities are closely related to the forming pressure. Higher sintering temperature and longer holding time in the range of our experiments lead to finer porous structure, coarser joints between wires, and lower porosities. The Steel wire mesh exhibits three-stage elastic–plastic behaviors under compressive loading which are similar to that of other cellular materials. The yield strength and Young's modulus of the Steel wire mesh decrease rapidly with the increase in porosities. When the porosity increases from 33.90 to 56.27%, the yield strength drops from 46.9 to 14.8 MPa and the Young's modulus drops from 1.42 to 0.42 GPa.
Agata Dudek - One of the best experts on this subject based on the ideXlab platform.
-
Formation of microstructure and properties of Sintered Steel through remelting of surface layer
2016Co-Authors: Agata Wrońska, Agata DudekAbstract:Formation of Microstructure and Properties of Sintered Steel through remelting of surface layer
-
Surface remelting of 316 L + 434 L Sintered Steel: microstructure and corrosion resistance
Journal of Solid State Electrochemistry, 2014Co-Authors: Agata Dudek, Agata Wronska, Lidia AdamczykAbstract:This study presents arc surface remelting of three types of Sintered stainless Steels carried out in order to constitute a homogeneous microstructure in the surface layer which is free from open and interconnected porosity. The main aim of this treatment was to improve functional properties of the sinters analysed, especially their resistance to pitting corrosion. The sinters were obtained from powders of 316 L and 434 L Steels. The PM austenitic-ferritic stainless Steels are used mainly in the automotive industry, but their general application is still limited due to relatively poor corrosion properties when compared to casts or wrought components. This study used the gas tungsten arc welding (GTAW) process as a method of economical surface treatment. The effect of surface treatment was evaluated based on macro- and microstructural observations, energy-dispersive X-ray spectroscopy (EDX) analysis, X-ray phase analysis, measurements of surface roughness and electrochemical examinations. It was found that a cellular or mixed cellular and dendritic structure was formed in the remelted zone of the sinters after remelting. X-ray analysis demonstrated that application of remelting contributes to formation of the austenitic phase in the surface layer. The corrosion resistance of the remelted surface layers was evaluated using polarization tests in 0.5 M NaCl solution. It was found that arc surface remelted layers exhibit much better anticorrosive properties than sinters without surface treatment. Microstructural observations of the surface of specimens after electrochemical tests showed only a few single pits in the remelted layer, while the surface of initial sinters was much more corroded.
-
surface remelting of 316 l 434 l Sintered Steel microstructure and corrosion resistance
Journal of Solid State Electrochemistry, 2014Co-Authors: Agata Dudek, Agata Wronska, Lidia AdamczykAbstract:This study presents arc surface remelting of three types of Sintered stainless Steels carried out in order to constitute a homogeneous microstructure in the surface layer which is free from open and interconnected porosity. The main aim of this treatment was to improve functional properties of the sinters analysed, especially their resistance to pitting corrosion. The sinters were obtained from powders of 316 L and 434 L Steels. The PM austenitic-ferritic stainless Steels are used mainly in the automotive industry, but their general application is still limited due to relatively poor corrosion properties when compared to casts or wrought components. This study used the gas tungsten arc welding (GTAW) process as a method of economical surface treatment. The effect of surface treatment was evaluated based on macro- and microstructural observations, energy-dispersive X-ray spectroscopy (EDX) analysis, X-ray phase analysis, measurements of surface roughness and electrochemical examinations. It was found that a cellular or mixed cellular and dendritic structure was formed in the remelted zone of the sinters after remelting. X-ray analysis demonstrated that application of remelting contributes to formation of the austenitic phase in the surface layer. The corrosion resistance of the remelted surface layers was evaluated using polarization tests in 0.5 M NaCl solution. It was found that arc surface remelted layers exhibit much better anticorrosive properties than sinters without surface treatment. Microstructural observations of the surface of specimens after electrochemical tests showed only a few single pits in the remelted layer, while the surface of initial sinters was much more corroded.
Lidia Adamczyk - One of the best experts on this subject based on the ideXlab platform.
-
Surface remelting of 316 L + 434 L Sintered Steel: microstructure and corrosion resistance
Journal of Solid State Electrochemistry, 2014Co-Authors: Agata Dudek, Agata Wronska, Lidia AdamczykAbstract:This study presents arc surface remelting of three types of Sintered stainless Steels carried out in order to constitute a homogeneous microstructure in the surface layer which is free from open and interconnected porosity. The main aim of this treatment was to improve functional properties of the sinters analysed, especially their resistance to pitting corrosion. The sinters were obtained from powders of 316 L and 434 L Steels. The PM austenitic-ferritic stainless Steels are used mainly in the automotive industry, but their general application is still limited due to relatively poor corrosion properties when compared to casts or wrought components. This study used the gas tungsten arc welding (GTAW) process as a method of economical surface treatment. The effect of surface treatment was evaluated based on macro- and microstructural observations, energy-dispersive X-ray spectroscopy (EDX) analysis, X-ray phase analysis, measurements of surface roughness and electrochemical examinations. It was found that a cellular or mixed cellular and dendritic structure was formed in the remelted zone of the sinters after remelting. X-ray analysis demonstrated that application of remelting contributes to formation of the austenitic phase in the surface layer. The corrosion resistance of the remelted surface layers was evaluated using polarization tests in 0.5 M NaCl solution. It was found that arc surface remelted layers exhibit much better anticorrosive properties than sinters without surface treatment. Microstructural observations of the surface of specimens after electrochemical tests showed only a few single pits in the remelted layer, while the surface of initial sinters was much more corroded.
-
surface remelting of 316 l 434 l Sintered Steel microstructure and corrosion resistance
Journal of Solid State Electrochemistry, 2014Co-Authors: Agata Dudek, Agata Wronska, Lidia AdamczykAbstract:This study presents arc surface remelting of three types of Sintered stainless Steels carried out in order to constitute a homogeneous microstructure in the surface layer which is free from open and interconnected porosity. The main aim of this treatment was to improve functional properties of the sinters analysed, especially their resistance to pitting corrosion. The sinters were obtained from powders of 316 L and 434 L Steels. The PM austenitic-ferritic stainless Steels are used mainly in the automotive industry, but their general application is still limited due to relatively poor corrosion properties when compared to casts or wrought components. This study used the gas tungsten arc welding (GTAW) process as a method of economical surface treatment. The effect of surface treatment was evaluated based on macro- and microstructural observations, energy-dispersive X-ray spectroscopy (EDX) analysis, X-ray phase analysis, measurements of surface roughness and electrochemical examinations. It was found that a cellular or mixed cellular and dendritic structure was formed in the remelted zone of the sinters after remelting. X-ray analysis demonstrated that application of remelting contributes to formation of the austenitic phase in the surface layer. The corrosion resistance of the remelted surface layers was evaluated using polarization tests in 0.5 M NaCl solution. It was found that arc surface remelted layers exhibit much better anticorrosive properties than sinters without surface treatment. Microstructural observations of the surface of specimens after electrochemical tests showed only a few single pits in the remelted layer, while the surface of initial sinters was much more corroded.
Guo He - One of the best experts on this subject based on the ideXlab platform.
-
structure deformation and failure of Sintered Steel wire mesh under torsion loading
Materials & Design, 2009Co-Authors: Guo He, Luhai WuAbstract:Abstract Sintered Steel wire mesh materials with total porosities of 36.3–61.8%, which are subjected to torsion loading, have been investigated in terms of deformation mode and failure mechanism. The experiments reveal that the twisted wire’s stretching, moving and rotating are main deformation mode, which leads to most of wires orientating towards the torsion direction. The failure occurs when the oriented wires fracture continuously, and leave behind a 45° fracture surface. The shear strength and shear modulus of the tested wire mesh samples are evaluated in the range of 44–103 MPa and 47–718 MPa, respectively. With an increase in porosity both the shear strength and the shear modulus decrease.
-
fabrication of Sintered Steel wire mesh and its compressive properties
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2008Co-Authors: Guo He, Luhai WuAbstract:Abstract Porous Steel wire mesh with open porosities of 33.90–56.27% and pore sizes of 25–1300 μm has been prepared by metallurgical route. The porous morphologies and porosities of the wire mesh have been investigated in terms of forming pressure, sintering temperature and sintering holding time. The pore size distribution in the as-prepared samples has been determined by means of metallographic statistic measurement. The results indicate that the total and open porosities are closely related to the forming pressure. Higher sintering temperature and longer holding time in the range of our experiments lead to finer porous structure, coarser joints between wires, and lower porosities. The Steel wire mesh exhibits three-stage elastic–plastic behaviors under compressive loading which are similar to that of other cellular materials. The yield strength and Young's modulus of the Steel wire mesh decrease rapidly with the increase in porosities. When the porosity increases from 33.90 to 56.27%, the yield strength drops from 46.9 to 14.8 MPa and the Young's modulus drops from 1.42 to 0.42 GPa.
Agata Wronska - One of the best experts on this subject based on the ideXlab platform.
-
Surface remelting of 316 L + 434 L Sintered Steel: microstructure and corrosion resistance
Journal of Solid State Electrochemistry, 2014Co-Authors: Agata Dudek, Agata Wronska, Lidia AdamczykAbstract:This study presents arc surface remelting of three types of Sintered stainless Steels carried out in order to constitute a homogeneous microstructure in the surface layer which is free from open and interconnected porosity. The main aim of this treatment was to improve functional properties of the sinters analysed, especially their resistance to pitting corrosion. The sinters were obtained from powders of 316 L and 434 L Steels. The PM austenitic-ferritic stainless Steels are used mainly in the automotive industry, but their general application is still limited due to relatively poor corrosion properties when compared to casts or wrought components. This study used the gas tungsten arc welding (GTAW) process as a method of economical surface treatment. The effect of surface treatment was evaluated based on macro- and microstructural observations, energy-dispersive X-ray spectroscopy (EDX) analysis, X-ray phase analysis, measurements of surface roughness and electrochemical examinations. It was found that a cellular or mixed cellular and dendritic structure was formed in the remelted zone of the sinters after remelting. X-ray analysis demonstrated that application of remelting contributes to formation of the austenitic phase in the surface layer. The corrosion resistance of the remelted surface layers was evaluated using polarization tests in 0.5 M NaCl solution. It was found that arc surface remelted layers exhibit much better anticorrosive properties than sinters without surface treatment. Microstructural observations of the surface of specimens after electrochemical tests showed only a few single pits in the remelted layer, while the surface of initial sinters was much more corroded.
-
surface remelting of 316 l 434 l Sintered Steel microstructure and corrosion resistance
Journal of Solid State Electrochemistry, 2014Co-Authors: Agata Dudek, Agata Wronska, Lidia AdamczykAbstract:This study presents arc surface remelting of three types of Sintered stainless Steels carried out in order to constitute a homogeneous microstructure in the surface layer which is free from open and interconnected porosity. The main aim of this treatment was to improve functional properties of the sinters analysed, especially their resistance to pitting corrosion. The sinters were obtained from powders of 316 L and 434 L Steels. The PM austenitic-ferritic stainless Steels are used mainly in the automotive industry, but their general application is still limited due to relatively poor corrosion properties when compared to casts or wrought components. This study used the gas tungsten arc welding (GTAW) process as a method of economical surface treatment. The effect of surface treatment was evaluated based on macro- and microstructural observations, energy-dispersive X-ray spectroscopy (EDX) analysis, X-ray phase analysis, measurements of surface roughness and electrochemical examinations. It was found that a cellular or mixed cellular and dendritic structure was formed in the remelted zone of the sinters after remelting. X-ray analysis demonstrated that application of remelting contributes to formation of the austenitic phase in the surface layer. The corrosion resistance of the remelted surface layers was evaluated using polarization tests in 0.5 M NaCl solution. It was found that arc surface remelted layers exhibit much better anticorrosive properties than sinters without surface treatment. Microstructural observations of the surface of specimens after electrochemical tests showed only a few single pits in the remelted layer, while the surface of initial sinters was much more corroded.