The Experts below are selected from a list of 6447 Experts worldwide ranked by ideXlab platform
S Chatterjee - One of the best experts on this subject based on the ideXlab platform.
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Materials Science and Engineering A 407 (2005) 154-160 Diffusion bonding of commercially pure titanium to 304 stainless steel using copper interlayer
2020Co-Authors: S Kundu, S Chatterjee, M Ghosh, A Laik, K Bhanumurthy, G B Kale, Cu CutiAbstract:Abstract Diffusion bonding was carried out between commercially pure titanium (cpTi) and 304 stainless steel (304ss) using copper as interlayer in the temperature range of 850-950 • C for 1.5 h under 3 MPa load in vacuum. The microstructures of the transition joints were revealed in optical and scanning electron microscopy (SEM). The study exhibits the presence of different reaction layers in the diffusion zone and their chemical compositions were determined by energy dispersive spectroscopy. The occurrence of different intermetallic compounds such as CuTi 2 , CuTi, Cu 3 Ti 2 , Cu 4 Ti 3 , FeTi, Fe 2 Ti, Cr 2 Ti, T 2 (Ti 40 Cu 60−x Fe x ; 5 < x < 17), T 3 (Ti 43 Cu 57−x Fe x ; 21 < x < 24) and T 5 (Ti 45 Cu 55−x Fe x ; 4 < x < 5) has been predicted from the ternary phase diagrams of Fe-Cu-Ti and Fe-Cr-Ti. These reaction products were confirmed by X-ray diffraction technique. The maximum bond strength of ∼318 MPa (∼99.7% of Ti) was obtained for the couple bonded at 900 • C due to better coalescence of Mating Surface. With the rise in joining temperature to 950 • C, decrease in bond strength occurs due to formation of brittle Fe-Ti bases intermetallics. At a lower joining temperature of 850 • C, bond strength is also lower due to incomplete coalescence of the Mating Surfaces
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diffusion bonding of commercially pure titanium and 17 4 precipitation hardening stainless steel
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2006Co-Authors: S Kundu, M Ghosh, S ChatterjeeAbstract:Commercially pure titanium and 17-4 precipitation hardening stainless steel were diffusion bonded in the temperature range of 850–950 °C for 7.2 ks under 3.5 MPa uniaxial load in vacuum. The transition joints were examined in optical and scanning electron microscope. The chemical compositions of reaction layers in the diffusion zone were determined by energy dispersive spectroscopy and the formation of intermetallics like σ phase, Fe2Ti, FeTi, Cr2Ti, χ, α-Fe, α-Ti and β-Ti phases were predicted. These intermetallics were confirmed by X-ray diffraction technique. The bond strength was evaluated and maximum tensile strength of 102% and shear strength of 81% of those of Ti along with 10.6% ductility were obtained for the diffusion couple, when processed at 900 °C. These occur due to better coalescence of Mating Surface asperities with respect to 850 °C processing temperature. The volume fraction of the intermetallics increases with the rise in joining temperature and bond strength naturally drops.
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diffusion bonding of commercially pure titanium to 304 stainless steel using copper interlayer
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2005Co-Authors: S Kundu, M Ghosh, A Laik, K Bhanumurthy, G B Kale, S ChatterjeeAbstract:Diffusion bonding was carried out between commercially pure titanium (cpTi) and 304 stainless steel (304ss) using copper as interlayer in the temperature range of 850–950 ◦ C for 1.5 h under 3 MPa load in vacuum. The microstructures of the transition joints were revealed in optical and scanning electron microscopy (SEM). The study exhibits the presence of different reaction layers in the diffusion zone and their chemical compositions were determined by energy dispersive spectroscopy. The occurrence of different intermetallic compounds such as CuTi2, CuTi, Cu3Ti2 ,C u 4Ti3, FeTi, Fe2Ti, Cr2Ti, T2 (Ti40Cu60−xFex ;5
Mating Surface. With the rise in joining temperature to 950 ◦ C, decrease in bond strength occurs due to formation of brittle Fe–Ti bases intermetallics. At a lower joining temperature of 850 ◦ C, bond strength is also lower due to incomplete coalescence of the Mating -
diffusion bonding of commercially pure titanium to 304 stainless steel using copper interlayer
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2005Co-Authors: S Kundu, M Ghosh, A Laik, K Bhanumurthy, G B Kale, S ChatterjeeAbstract:Diffusion bonding was carried out between commercially pure titanium (cpTi) and 304 stainless steel (304ss) using copper as interlayer in the temperature range of 850–950 ◦ C for 1.5 h under 3 MPa load in vacuum. The microstructures of the transition joints were revealed in optical and scanning electron microscopy (SEM). The study exhibits the presence of different reaction layers in the diffusion zone and their chemical compositions were determined by energy dispersive spectroscopy. The occurrence of different intermetallic compounds such as CuTi2, CuTi, Cu3Ti2 ,C u 4Ti3, FeTi, Fe2Ti, Cr2Ti, T2 (Ti40Cu60−xFex ;5
Mating Surface. With the rise in joining temperature to 950 ◦ C, decrease in bond strength occurs due to formation of brittle Fe–Ti bases intermetallics. At a lower joining temperature of 850 ◦ C, bond strength is also lower due to incomplete coalescence of the Mating
Toshifumi Mawatari - One of the best experts on this subject based on the ideXlab platform.
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Tribological Properties of Thermally Sprayed WC Cermet Coating under Extreme Operating Conditions 13 TRIBOLOGICAL PROPERTIES OF THERMALLY SPRAYED WC CERMET COATING UNDER EXTREME OPERATING CONDITIONS
2015Co-Authors: Dewan Muhammad Nuruzzaman, Akira Nakajima, Toshifumi MawatariAbstract:Abstract: In this study, tribological properties of thermally sprayed WC-Cr-Ni cermet coating were investigated experimentally under lubricated rolling with sliding contact conditions. Hi-HVOF sprayed WC cermet coatings were deposited onto the axially ground, blasted and circumferentially ground roller specimens made of carburized hardened steel. Under extreme operating conditions such as contact pressure PH = 1.4 GPa, slip ratio s =- 28.0 % and Mating Surface roughness Rmax = 6.0 µm, the effects of substrate Surface finish on the tribological properties of the cermet coating were examined. It was found that cermet coating showed a long life and durability was not influenced by the substrate Surface finish. It was also found that coefficient of friction, oil film formation, Surface temperature and oil film thickness were not much influenced by the substrate Surface finish. On the other hand, Surface hardness, Surface roughness and coating material loss were significantly influenced depending on the substrate Surface finish
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characteristics of thermally sprayed wc cermet coating under lubricated rolling with sliding contact
Journal of Mechanical Engineering, 2008Co-Authors: Dewan Muhammad Nuruzzaman, Akira Nakajima, Toshifumi MawatariAbstract:The characteristics of thermally sprayed WC-Cr-Ni cermet coating under lubricated rolling with sliding contact condition were examined experimentally. Experiments were performed using a two-roller testing machine. The coating was formed onto the blasted or ground roller specimens made of thermally refined carbon steel or induction hardened carbon steel by high energy type flame spraying (Hi-HVOF). A mirror-like finished cermet coated steel roller was mated with a non-coated carburized hardened steel roller. In the case of thermally refined steel substrate and for the Mating Surface roughness R max =0.1 I¼m, coating on the ground substrate showed lower durability than that on the blasted substrate. For the Mating Surface roughness R max =3.0 I¼m, coating on the ground substrate showed an extremely short life as compared with that on the blasted substrate. In general, durability of cermet coating was greatly increased due to the increase in the coating thickness. In the case of induction hardened steel substrate, coating on the blasted or ground substrate showed high durability for both R max =0.1 I¼m and 3.0 I¼m. Coefficient of friction and oil film thickness were markedly influenced by the Mating Surface roughness but these were hardly affected by the substrate material. In addition, depending on the Mating Surface roughness, significant differences in the Surface roughness of coated roller and depth of flaking on the coated roller were found. Keywords: WC cermet, Mating Surface roughness, Substrate Surface kind, Substrate material doi:10.3329/jme.v37i0.815 Journal of Mechanical Engineering Vol.37 June 2007, pp.18-23
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effects of substrate Surface finish and substrate material on durability of thermally sprayed wc cermet coating in rolling with sliding contact
Tribology International, 2006Co-Authors: Dewan Muhammad Nuruzzaman, Akira Nakajima, Toshifumi MawatariAbstract:Abstract In this study, using a two-roller testing machine, the authors examined the Surface durability of thermally sprayed WC-Cr-Ni cermet coating in lubricated rolling with sliding contact conditions. The coating was formed onto the axially ground, blasted and circumferentially ground roller specimens made of a thermally refined carbon steel or an induction hardened carbon steel by means of the high energy type flame spraying (Hi-HVOF) method. The WC cermet coated roller finished to a mirror-like condition was mated with the carburized steel roller without coating having a Surface roughness of Ry=3.0∼5.0 μm. In the experiments, a maximum Hertzian stress of P H =0.6 or 0.8 GPa was applied for the thermally refined carbon steel roller and P H =1.4 GPa was applied for the induction hardened carbon steel roller in line contact condition. As a result, it was found that in the case of induction hardened steel substrate, the coated roller generally exhibits a long life without any serious damage and the Surface durability is hardly affected by the substrate Surface finish, while in the case of thermally refined steel substrate, the durability of coated roller is lowered and the life to flaking is very short particularly when the substrate Surface is circumferentially ground and the Mating Surface is rough. The Surface durability of coated roller was also compared with the durability of steel roller without coating. Finally, in order to discuss the durability of coated roller, the elastic-plastic behavior of the subSurface layer under repeated rolling with sliding contact was analyzed using a finite element method (FEM).
S Kundu - One of the best experts on this subject based on the ideXlab platform.
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Materials Science and Engineering A 407 (2005) 154-160 Diffusion bonding of commercially pure titanium to 304 stainless steel using copper interlayer
2020Co-Authors: S Kundu, S Chatterjee, M Ghosh, A Laik, K Bhanumurthy, G B Kale, Cu CutiAbstract:Abstract Diffusion bonding was carried out between commercially pure titanium (cpTi) and 304 stainless steel (304ss) using copper as interlayer in the temperature range of 850-950 • C for 1.5 h under 3 MPa load in vacuum. The microstructures of the transition joints were revealed in optical and scanning electron microscopy (SEM). The study exhibits the presence of different reaction layers in the diffusion zone and their chemical compositions were determined by energy dispersive spectroscopy. The occurrence of different intermetallic compounds such as CuTi 2 , CuTi, Cu 3 Ti 2 , Cu 4 Ti 3 , FeTi, Fe 2 Ti, Cr 2 Ti, T 2 (Ti 40 Cu 60−x Fe x ; 5 < x < 17), T 3 (Ti 43 Cu 57−x Fe x ; 21 < x < 24) and T 5 (Ti 45 Cu 55−x Fe x ; 4 < x < 5) has been predicted from the ternary phase diagrams of Fe-Cu-Ti and Fe-Cr-Ti. These reaction products were confirmed by X-ray diffraction technique. The maximum bond strength of ∼318 MPa (∼99.7% of Ti) was obtained for the couple bonded at 900 • C due to better coalescence of Mating Surface. With the rise in joining temperature to 950 • C, decrease in bond strength occurs due to formation of brittle Fe-Ti bases intermetallics. At a lower joining temperature of 850 • C, bond strength is also lower due to incomplete coalescence of the Mating Surfaces
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diffusion bonding of commercially pure titanium and 17 4 precipitation hardening stainless steel
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2006Co-Authors: S Kundu, M Ghosh, S ChatterjeeAbstract:Commercially pure titanium and 17-4 precipitation hardening stainless steel were diffusion bonded in the temperature range of 850–950 °C for 7.2 ks under 3.5 MPa uniaxial load in vacuum. The transition joints were examined in optical and scanning electron microscope. The chemical compositions of reaction layers in the diffusion zone were determined by energy dispersive spectroscopy and the formation of intermetallics like σ phase, Fe2Ti, FeTi, Cr2Ti, χ, α-Fe, α-Ti and β-Ti phases were predicted. These intermetallics were confirmed by X-ray diffraction technique. The bond strength was evaluated and maximum tensile strength of 102% and shear strength of 81% of those of Ti along with 10.6% ductility were obtained for the diffusion couple, when processed at 900 °C. These occur due to better coalescence of Mating Surface asperities with respect to 850 °C processing temperature. The volume fraction of the intermetallics increases with the rise in joining temperature and bond strength naturally drops.
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diffusion bonding of commercially pure titanium to 304 stainless steel using copper interlayer
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2005Co-Authors: S Kundu, M Ghosh, A Laik, K Bhanumurthy, G B Kale, S ChatterjeeAbstract:Diffusion bonding was carried out between commercially pure titanium (cpTi) and 304 stainless steel (304ss) using copper as interlayer in the temperature range of 850–950 ◦ C for 1.5 h under 3 MPa load in vacuum. The microstructures of the transition joints were revealed in optical and scanning electron microscopy (SEM). The study exhibits the presence of different reaction layers in the diffusion zone and their chemical compositions were determined by energy dispersive spectroscopy. The occurrence of different intermetallic compounds such as CuTi2, CuTi, Cu3Ti2 ,C u 4Ti3, FeTi, Fe2Ti, Cr2Ti, T2 (Ti40Cu60−xFex ;5
Mating Surface. With the rise in joining temperature to 950 ◦ C, decrease in bond strength occurs due to formation of brittle Fe–Ti bases intermetallics. At a lower joining temperature of 850 ◦ C, bond strength is also lower due to incomplete coalescence of the Mating -
diffusion bonding of commercially pure titanium to 304 stainless steel using copper interlayer
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2005Co-Authors: S Kundu, M Ghosh, A Laik, K Bhanumurthy, G B Kale, S ChatterjeeAbstract:Diffusion bonding was carried out between commercially pure titanium (cpTi) and 304 stainless steel (304ss) using copper as interlayer in the temperature range of 850–950 ◦ C for 1.5 h under 3 MPa load in vacuum. The microstructures of the transition joints were revealed in optical and scanning electron microscopy (SEM). The study exhibits the presence of different reaction layers in the diffusion zone and their chemical compositions were determined by energy dispersive spectroscopy. The occurrence of different intermetallic compounds such as CuTi2, CuTi, Cu3Ti2 ,C u 4Ti3, FeTi, Fe2Ti, Cr2Ti, T2 (Ti40Cu60−xFex ;5
Mating Surface. With the rise in joining temperature to 950 ◦ C, decrease in bond strength occurs due to formation of brittle Fe–Ti bases intermetallics. At a lower joining temperature of 850 ◦ C, bond strength is also lower due to incomplete coalescence of the Mating
Dewan Muhammad Nuruzzaman - One of the best experts on this subject based on the ideXlab platform.
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Tribological Properties of Thermally Sprayed WC Cermet Coating under Extreme Operating Conditions 13 TRIBOLOGICAL PROPERTIES OF THERMALLY SPRAYED WC CERMET COATING UNDER EXTREME OPERATING CONDITIONS
2015Co-Authors: Dewan Muhammad Nuruzzaman, Akira Nakajima, Toshifumi MawatariAbstract:Abstract: In this study, tribological properties of thermally sprayed WC-Cr-Ni cermet coating were investigated experimentally under lubricated rolling with sliding contact conditions. Hi-HVOF sprayed WC cermet coatings were deposited onto the axially ground, blasted and circumferentially ground roller specimens made of carburized hardened steel. Under extreme operating conditions such as contact pressure PH = 1.4 GPa, slip ratio s =- 28.0 % and Mating Surface roughness Rmax = 6.0 µm, the effects of substrate Surface finish on the tribological properties of the cermet coating were examined. It was found that cermet coating showed a long life and durability was not influenced by the substrate Surface finish. It was also found that coefficient of friction, oil film formation, Surface temperature and oil film thickness were not much influenced by the substrate Surface finish. On the other hand, Surface hardness, Surface roughness and coating material loss were significantly influenced depending on the substrate Surface finish
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characteristics of thermally sprayed wc cermet coating under lubricated rolling with sliding contact
Journal of Mechanical Engineering, 2008Co-Authors: Dewan Muhammad Nuruzzaman, Akira Nakajima, Toshifumi MawatariAbstract:The characteristics of thermally sprayed WC-Cr-Ni cermet coating under lubricated rolling with sliding contact condition were examined experimentally. Experiments were performed using a two-roller testing machine. The coating was formed onto the blasted or ground roller specimens made of thermally refined carbon steel or induction hardened carbon steel by high energy type flame spraying (Hi-HVOF). A mirror-like finished cermet coated steel roller was mated with a non-coated carburized hardened steel roller. In the case of thermally refined steel substrate and for the Mating Surface roughness R max =0.1 I¼m, coating on the ground substrate showed lower durability than that on the blasted substrate. For the Mating Surface roughness R max =3.0 I¼m, coating on the ground substrate showed an extremely short life as compared with that on the blasted substrate. In general, durability of cermet coating was greatly increased due to the increase in the coating thickness. In the case of induction hardened steel substrate, coating on the blasted or ground substrate showed high durability for both R max =0.1 I¼m and 3.0 I¼m. Coefficient of friction and oil film thickness were markedly influenced by the Mating Surface roughness but these were hardly affected by the substrate material. In addition, depending on the Mating Surface roughness, significant differences in the Surface roughness of coated roller and depth of flaking on the coated roller were found. Keywords: WC cermet, Mating Surface roughness, Substrate Surface kind, Substrate material doi:10.3329/jme.v37i0.815 Journal of Mechanical Engineering Vol.37 June 2007, pp.18-23
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effects of substrate Surface finish and substrate material on durability of thermally sprayed wc cermet coating in rolling with sliding contact
Tribology International, 2006Co-Authors: Dewan Muhammad Nuruzzaman, Akira Nakajima, Toshifumi MawatariAbstract:Abstract In this study, using a two-roller testing machine, the authors examined the Surface durability of thermally sprayed WC-Cr-Ni cermet coating in lubricated rolling with sliding contact conditions. The coating was formed onto the axially ground, blasted and circumferentially ground roller specimens made of a thermally refined carbon steel or an induction hardened carbon steel by means of the high energy type flame spraying (Hi-HVOF) method. The WC cermet coated roller finished to a mirror-like condition was mated with the carburized steel roller without coating having a Surface roughness of Ry=3.0∼5.0 μm. In the experiments, a maximum Hertzian stress of P H =0.6 or 0.8 GPa was applied for the thermally refined carbon steel roller and P H =1.4 GPa was applied for the induction hardened carbon steel roller in line contact condition. As a result, it was found that in the case of induction hardened steel substrate, the coated roller generally exhibits a long life without any serious damage and the Surface durability is hardly affected by the substrate Surface finish, while in the case of thermally refined steel substrate, the durability of coated roller is lowered and the life to flaking is very short particularly when the substrate Surface is circumferentially ground and the Mating Surface is rough. The Surface durability of coated roller was also compared with the durability of steel roller without coating. Finally, in order to discuss the durability of coated roller, the elastic-plastic behavior of the subSurface layer under repeated rolling with sliding contact was analyzed using a finite element method (FEM).
Satish V. Kailas - One of the best experts on this subject based on the ideXlab platform.
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On the effect of Surface texture on friction and transfer layer formation-A study using Al and steel pair
Wear, 2008Co-Authors: Pradeep L. Menezes, Kishore, Satish V. KailasAbstract:Surface texture of a tool plays an important role as it primarily controls the frictional behavior at the interface. In the present investigation, a pin-on-plate sliding tester was used to identify the effect of directionality of Surface grinding marks on coefficient of friction and transfer layer formation. 080 M40 steel plates were ground to attain different Surface roughness with unidirectional grinding marks. Super purity aluminium pins were slid at a sliding velocity of 2 mm/s against the prepared steel plates. Grinding angle (i.e., the angle between direction of sliding and grinding marks) was varied between 0 degrees and 90 degrees in the tests. Normal load was varied from 0 to 120 N during the tests. Experiments were conducted under both dry and lubricated conditions in ambient environment. Scanning electron micrographs of the contact Surfaces of pins and plates were used to study the Surface features that included the morphology of the transfer layer. Surface roughness parameters of the steel plates were measured in the direction of the sliding using an optical profilometer. It was observed that the coefficient of friction and transfer layer formation depends primarily on the directionality, of the grinding marks of the harder Mating Surface. Under lubricated conditions, stick-slip phenomena was observed, the amplitude of which depends on the plowing component of friction. The presence of stick-slip motion under lubricated conditions could be attributed to the molecular deformation of the lubricant component confined between asperities. The grinding angle effect on coefficient of friction was attributed to the variation in plowing component of friction, which in turn depends on the mean slope of the profile of the harder Mating Surface.
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effect of roughness parameter and grinding angle on coefficient of friction when sliding of al mg alloy over en8 steel
Journal of Tribology-transactions of The Asme, 2006Co-Authors: Pradeep L. Menezes, Satish V. KailasAbstract:Surface topography of harder Mating Surface plays an important role in metal forming operations as it predominantly controls the frictional behavior at the interface. In the present investigation, an inclined scratch tester was used to understand the effect of direction of Surface grinding marks on interface friction and transfer layer formation. EN8 steel flats were ground to attain different Surface roughnesses with unidirectional grinding marks. Al–Mg alloy pins were then scratched against the prepared EN8 steel flats. The grinding angle (angle between direction of scratch and grinding marks) was varied between 0 deg and 90 deg during the scratch tests. Scanning electron micrography of the contact Surfaces revealed the transfer layer morphology. The coefficient of friction and transfer layer formation were observed to depend primarily on the direction of grinding marks of the harder Mating Surface, and independent of the Surface roughness of harder Mating Surface. The grinding angle effect was attributed to the variation of plowing component of friction with grinding angle.
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influence of Surface texture on coefficient of friction and transfer layer formation during sliding of pure magnesium pin on 080 m40 en8 steel plate
Wear, 2006Co-Authors: Pradeep L. Menezes, Satish V. KailasAbstract:Surface texture of a harder Mating Surface has a great influence on frictional behavior during sliding against softer materials. In the present investigation, experiments were conducted using a Pin-on-Plate inclined sliding tester to study the effect of the Surface texture of hard Surfaces on the coefficient of friction and transfer layer formation. 080 M40 (EN8) steel plates were ground to attain Surfaces of different texture with different roughness. Pure magnesium pins were then slid at a sliding speed of 2 mm/s against the prepared steel plates. Scanning electron micrographs of the contact Surfaces of pins and plates were used to reveal the morphology of transfer layer. It was observed that the coefficient of friction, formation of transfer layer, and the presence of stick–slip motion depend primarily on the Surface texture of hard Surfaces, but independent of Surface roughness of hard Surfaces. The effect of Surface texture on coefficient of friction was attributed to the variation of plowing component of friction for different Surfaces.
