The Experts below are selected from a list of 2463 Experts worldwide ranked by ideXlab platform
C Bolfarini - One of the best experts on this subject based on the ideXlab platform.
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sliding wear of spray formed high chromium White Cast Iron alloys
Wear, 2005Co-Authors: T T Matsuo, Claudio Shyinti Kiminami, W Botta J Fo, C BolfariniAbstract:Abstract The sliding wear resistance of high-chromium White Cast Iron obtained by spray-forming was studied to determine how the refined microstructures produced by this process, the structure of the matrix, and the amount and distribution of carbides affect the material. Three alloys containing different concentrations of carbon and chromium, namely 2.4 wt.%C–15 wt.%Cr, 3.5 wt.%C–15 wt.%Cr, and 3 wt.%C–19 wt.%Cr, were spray-formed and conventionally Cast. Pin-on-disk wear tests were conducted according to the ASTM G99-95 standard. White Cast Iron pins having an 8-mm diameter and 15-mm length were tested against a counterpart VC 131 tool steel disk hardened to 63HRC. The wear resistance was evaluated as a function of the samples’ weight loss and the wear mechanisms were observed by scanning electron microscopy (SEM). These wear mechanisms, which were active in all the materials, were fracture and detachment of carbides and oxidation, which suggests three-body abrasion, in addition to the presence of cracks in the matrix, particularly in the materials containing large amounts of austenite. Disk wear rates were found to be higher than high-chromium White Cast Iron pin wear rates. These wear rates were more pronounced when the disks were tested against the conventionally Cast pins, which showed coarser carbides. The spray-formed alloy, 3.0 wt.%C–19.0 wt.%Cr, showed better wear resistance in this study than the other alloys because of its more refined microstructure, greater balance among the austenite, martensite and M 7 C 3 carbide phases, and greater resistance to oxidation.
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microstructure and wear resistance of spray formed high chromium White Cast Iron
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2004Co-Authors: A H Kasama, Claudio Shyinti Kiminami, W Botta J Fo, Aroldo Mourisco, C BolfariniAbstract:Abstract A 2.9% C–22% Cr White Cast Iron was processed by spray forming (SF) aiming to investigate the resulting microstructure and the wear resistance of this alloy. Two gas to metal flow rate ratios (GMR) of 0.12 and 0.23 were used. The samples were characterized by wear resistance tests, X-ray diffraction (XRD), optical microscopy and scanning electron microscopy (SEM), in both as-sprayed condition and after heat treatments. The as-sprayed microstructure showed M7C3 carbides embedded in a matrix of austenite and martensite and after heat treatments the matrix became a mixture of pearlite and austenite, which presented a better performance in dry sand/rubber wheel wear resistance tests, particularly when associated with a fine distribution of carbides at the higher GMR.
Hua Tian - One of the best experts on this subject based on the ideXlab platform.
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improving the wear resistance of White Cast Iron using a new concept high entropy microstructure
Wear, 2011Co-Authors: Y P Wang, D Y Li, Leo Parent, Hua TianAbstract:Abstract This study was conducted with attempt to break through the bottleneck using a new concept – high-entropy microstructure. It has been recently demonstrated that an alloy containing more than five elements with the concentration of each element in the range of 5–35% could have a so-called high-entropy microstructure, which is very fine without large-sized intermetallic phases that reduce the resistance to fracture during high-stress wear and impact wear. In this study, this new concept was applied to modify a White Cast Iron by adding a few carbide-forming elements to the material simultaneously. The carbide-forming elements mutually competed to form their own carbides and this competition also helped to suppress the growth of the carbides, so that carbide refinement could be achieved. Strong carbide-forming elements, Ti, V, Mo and W, were simultaneously added to Fe–20Cr–5C alloy. As the amount of added elements increased, primary M 7 C 3 in the original White Cast Iron was eliminated with the formation of various finer carbides, including eutectic M 7 C 3 , MC and M 6 C. Compared to unmodified White Cast Iron, the modified alloys have demonstrated promising improvement in the wear resistance.
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Improving the wear resistance of White Cast Iron using a new concept - High-entropy microstructure
Wear, 2011Co-Authors: Y P Wang, Luc Parent, D Y Li, Hua TianAbstract:This study was conducted with attempt to break through the bottleneck using a new concept - high-entropy microstructure. It has been recently demonstrated that an alloy containing more than five elements with the concentration of each element in the range of 5-35% could have a so-called high-entropy microstructure, which is very fine without large-sized intermetallic phases that reduce the resistance to fracture during high-stress wear and impact wear. In this study, this new concept was applied to modify a White Cast Iron by adding a few carbide-forming elements to the material simultaneously. The carbide-forming elements mutually competed to form their own carbides and this competition also helped to suppress the growth of the carbides, so that carbide refinement could be achieved. Strong carbide-forming elements, Ti, V, Mo and W, were simultaneously added to Fe-20Cr-5C alloy. As the amount of added elements increased, primary M7C3in the original White Cast Iron was eliminated with the formation of various finer carbides, including eutectic M7C3, MC and M6C. Compared to unmodified White Cast Iron, the modified alloys have demonstrated promising improvement in the wear resistance. © 2011 Elsevier B.V.
Y P Wang - One of the best experts on this subject based on the ideXlab platform.
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improving the wear resistance of White Cast Iron using a new concept high entropy microstructure
Wear, 2011Co-Authors: Y P Wang, D Y Li, Leo Parent, Hua TianAbstract:Abstract This study was conducted with attempt to break through the bottleneck using a new concept – high-entropy microstructure. It has been recently demonstrated that an alloy containing more than five elements with the concentration of each element in the range of 5–35% could have a so-called high-entropy microstructure, which is very fine without large-sized intermetallic phases that reduce the resistance to fracture during high-stress wear and impact wear. In this study, this new concept was applied to modify a White Cast Iron by adding a few carbide-forming elements to the material simultaneously. The carbide-forming elements mutually competed to form their own carbides and this competition also helped to suppress the growth of the carbides, so that carbide refinement could be achieved. Strong carbide-forming elements, Ti, V, Mo and W, were simultaneously added to Fe–20Cr–5C alloy. As the amount of added elements increased, primary M 7 C 3 in the original White Cast Iron was eliminated with the formation of various finer carbides, including eutectic M 7 C 3 , MC and M 6 C. Compared to unmodified White Cast Iron, the modified alloys have demonstrated promising improvement in the wear resistance.
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Improving the wear resistance of White Cast Iron using a new concept - High-entropy microstructure
Wear, 2011Co-Authors: Y P Wang, Luc Parent, D Y Li, Hua TianAbstract:This study was conducted with attempt to break through the bottleneck using a new concept - high-entropy microstructure. It has been recently demonstrated that an alloy containing more than five elements with the concentration of each element in the range of 5-35% could have a so-called high-entropy microstructure, which is very fine without large-sized intermetallic phases that reduce the resistance to fracture during high-stress wear and impact wear. In this study, this new concept was applied to modify a White Cast Iron by adding a few carbide-forming elements to the material simultaneously. The carbide-forming elements mutually competed to form their own carbides and this competition also helped to suppress the growth of the carbides, so that carbide refinement could be achieved. Strong carbide-forming elements, Ti, V, Mo and W, were simultaneously added to Fe-20Cr-5C alloy. As the amount of added elements increased, primary M7C3in the original White Cast Iron was eliminated with the formation of various finer carbides, including eutectic M7C3, MC and M6C. Compared to unmodified White Cast Iron, the modified alloys have demonstrated promising improvement in the wear resistance. © 2011 Elsevier B.V.
W Botta J Fo - One of the best experts on this subject based on the ideXlab platform.
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sliding wear of spray formed high chromium White Cast Iron alloys
Wear, 2005Co-Authors: T T Matsuo, Claudio Shyinti Kiminami, W Botta J Fo, C BolfariniAbstract:Abstract The sliding wear resistance of high-chromium White Cast Iron obtained by spray-forming was studied to determine how the refined microstructures produced by this process, the structure of the matrix, and the amount and distribution of carbides affect the material. Three alloys containing different concentrations of carbon and chromium, namely 2.4 wt.%C–15 wt.%Cr, 3.5 wt.%C–15 wt.%Cr, and 3 wt.%C–19 wt.%Cr, were spray-formed and conventionally Cast. Pin-on-disk wear tests were conducted according to the ASTM G99-95 standard. White Cast Iron pins having an 8-mm diameter and 15-mm length were tested against a counterpart VC 131 tool steel disk hardened to 63HRC. The wear resistance was evaluated as a function of the samples’ weight loss and the wear mechanisms were observed by scanning electron microscopy (SEM). These wear mechanisms, which were active in all the materials, were fracture and detachment of carbides and oxidation, which suggests three-body abrasion, in addition to the presence of cracks in the matrix, particularly in the materials containing large amounts of austenite. Disk wear rates were found to be higher than high-chromium White Cast Iron pin wear rates. These wear rates were more pronounced when the disks were tested against the conventionally Cast pins, which showed coarser carbides. The spray-formed alloy, 3.0 wt.%C–19.0 wt.%Cr, showed better wear resistance in this study than the other alloys because of its more refined microstructure, greater balance among the austenite, martensite and M 7 C 3 carbide phases, and greater resistance to oxidation.
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microstructure and wear resistance of spray formed high chromium White Cast Iron
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2004Co-Authors: A H Kasama, Claudio Shyinti Kiminami, W Botta J Fo, Aroldo Mourisco, C BolfariniAbstract:Abstract A 2.9% C–22% Cr White Cast Iron was processed by spray forming (SF) aiming to investigate the resulting microstructure and the wear resistance of this alloy. Two gas to metal flow rate ratios (GMR) of 0.12 and 0.23 were used. The samples were characterized by wear resistance tests, X-ray diffraction (XRD), optical microscopy and scanning electron microscopy (SEM), in both as-sprayed condition and after heat treatments. The as-sprayed microstructure showed M7C3 carbides embedded in a matrix of austenite and martensite and after heat treatments the matrix became a mixture of pearlite and austenite, which presented a better performance in dry sand/rubber wheel wear resistance tests, particularly when associated with a fine distribution of carbides at the higher GMR.
Claudio Shyinti Kiminami - One of the best experts on this subject based on the ideXlab platform.
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sliding wear of spray formed high chromium White Cast Iron alloys
Wear, 2005Co-Authors: T T Matsuo, Claudio Shyinti Kiminami, W Botta J Fo, C BolfariniAbstract:Abstract The sliding wear resistance of high-chromium White Cast Iron obtained by spray-forming was studied to determine how the refined microstructures produced by this process, the structure of the matrix, and the amount and distribution of carbides affect the material. Three alloys containing different concentrations of carbon and chromium, namely 2.4 wt.%C–15 wt.%Cr, 3.5 wt.%C–15 wt.%Cr, and 3 wt.%C–19 wt.%Cr, were spray-formed and conventionally Cast. Pin-on-disk wear tests were conducted according to the ASTM G99-95 standard. White Cast Iron pins having an 8-mm diameter and 15-mm length were tested against a counterpart VC 131 tool steel disk hardened to 63HRC. The wear resistance was evaluated as a function of the samples’ weight loss and the wear mechanisms were observed by scanning electron microscopy (SEM). These wear mechanisms, which were active in all the materials, were fracture and detachment of carbides and oxidation, which suggests three-body abrasion, in addition to the presence of cracks in the matrix, particularly in the materials containing large amounts of austenite. Disk wear rates were found to be higher than high-chromium White Cast Iron pin wear rates. These wear rates were more pronounced when the disks were tested against the conventionally Cast pins, which showed coarser carbides. The spray-formed alloy, 3.0 wt.%C–19.0 wt.%Cr, showed better wear resistance in this study than the other alloys because of its more refined microstructure, greater balance among the austenite, martensite and M 7 C 3 carbide phases, and greater resistance to oxidation.
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microstructure and wear resistance of spray formed high chromium White Cast Iron
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2004Co-Authors: A H Kasama, Claudio Shyinti Kiminami, W Botta J Fo, Aroldo Mourisco, C BolfariniAbstract:Abstract A 2.9% C–22% Cr White Cast Iron was processed by spray forming (SF) aiming to investigate the resulting microstructure and the wear resistance of this alloy. Two gas to metal flow rate ratios (GMR) of 0.12 and 0.23 were used. The samples were characterized by wear resistance tests, X-ray diffraction (XRD), optical microscopy and scanning electron microscopy (SEM), in both as-sprayed condition and after heat treatments. The as-sprayed microstructure showed M7C3 carbides embedded in a matrix of austenite and martensite and after heat treatments the matrix became a mixture of pearlite and austenite, which presented a better performance in dry sand/rubber wheel wear resistance tests, particularly when associated with a fine distribution of carbides at the higher GMR.
