The Experts below are selected from a list of 3135 Experts worldwide ranked by ideXlab platform
D Y Li - One of the best experts on this subject based on the ideXlab platform.
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effects of mo and b additives on hardness and the resistance of cu ni alloy to Wear corrosion and Corrosive Wear
Metals and Materials International, 2020Co-Authors: Mingyu Wu, Qingyang Li, Wei Li, D L Chen, D Y LiAbstract:Due to its corrosion resistance, modifiable mechanical properties, and electrical conductivity, etc., CuNi alloy has found a wide variety of industrial applications, especially in the marine environment. It is highly desired if the mechanical strength and Wear resistance of CuNi alloy can reach a level comparable to that of steel while keeps its corrosion resistance. In this study, effects of Mo, B, and their combinations on microstructure and performance of CuNi alloy were investigated, including formation of second phases, hardness, and resistances to Wear, corrosion and Corrosive Wear. It was demonstrated that the Mo and B additives were effective in strengthening the CuNi alloy while maintaining reasonable corrosion resistance. In particular, the combination of Mo and B additives was more effective than a single additive to strengthen the alloy. Mo and B additives have demonstrated their great promise as new alloying elements to modify CuNi alloys.
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beneficial effects of yttrium on the performance of mg 3 al alloy during Wear corrosion and Corrosive Wear
Tribology International, 2013Co-Authors: Meisam Nouri, D Y LiAbstract:Abstract Magnesium has attracted considerable attention from industry especially from the transportation sector due to its high strength-to-weight ratio. However, poor Wear resistance and especially low corrosion resistance of Mg are barriers to extensive use of Mg alloys. Yttrium is one of the rare-earth elements, which has been demonstrated effective in improving the corrosion resistance and tribological properties of some metallic alloys. In this work, effects of yttrium on Wear, corrosion and Corrosive Wear of as-cast Mg–3%Al alloy were investigated. It was shown that the added Y increased the Wear resistance of the alloy through the formation of a harder second phase, Al2Y. In the case of corrosion, a small amount of added Y improved the corrosion resistance but such benefit decreased when the yttrium contents was higher than 2 wt%Y. When worn in tap water involving corrosion, yttrium also improved the performance of Mg–3%Al alloy. Possible mechanisms responsible for these changes are discussed.
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investigation of corrosion Wear synergistic attack on nanocrystalline cu deposits
Wear, 2007Co-Authors: D Y LiAbstract:Abstract In this work, the synergistic effect of corrosion and Wear on nanocrystalline and microcrystalline copper deposits produced by pulsed and direct current electrodeposition processes was investigated. Dynamic polarization tests, electrochemical scratch tests and electrochemical scratch tests were carried out in NaOH and H2SO4 solutions, respectively. The mechanical and electrochemical contributions to Corrosive Wear of the deposits were separated and correlated to their mechanical and electrochemical properties. The study demonstrated that the synergistic effect of corrosion and Wear on material loss depended on the microstructure, the environmental corrosivity and the Wearing load. Corrosion can be significantly enhanced by mechanical attack. The ratio of the Wear-accelerated corrosion rate to the pure corrosion rate of nanocrystalline copper was higher than that of the microcrystalline one in NaOH but lower in H2SO4 at a high scratch load, but the situation was reversed at a lower load. In Corrosive Wear, the damage of passive film in combination with metal removal could lead to rapid material loss.
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effects of strain rate of prior deformation on corrosion and Corrosive Wear of aisi 1045 steel in a 3 5 pct nacl solution
Metallurgical and Materials Transactions A-physical Metallurgy and Materials Science, 2007Co-Authors: D Y Li, R BouchardAbstract:Wear of materials in Corrosive environments has received considerable interest in recent years. It has been demonstrated that the Wear-corrosion synergy can be markedly affected by the strain rate. In this study, effects of strain rate of prior deformation on corrosion and Corrosive Wear of AISI 1045 steel in a 3.5 pct NaCl solution were investigated using an electrochemical test, scanning Kelvin probing, and Corrosive sliding Wear tests, respectively. Six strain rates of prior deformation, from 7.5 x 10 -4 s -1 to 2 s -1 , were employed for this study. In order to understand the mechanism responsible for the effects of the strain rate on corrosion and Corrosive Wear, worn surfaces, subsurface microstructure, microcracks, and residual strain were examined with scanning electron microscopy (SEM) X-ray line profile analysis. Microhardness tests were also carried out to investigate corresponding changes in mechanical properties of surface layers with respect to the strain rate. Based on the effects of prior strain at different rates on surface microstructure and resultant changes in electrochemical and mechanical properties, the corresponding Wear behavior of the steel in the 3.5 pct NaCl solution is discussed.
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effects of y2o3 addition on microstructure mechanical properties electrochemical behavior and resistance to Corrosive Wear of aluminum
Tribology International, 2007Co-Authors: W B Bouaeshi, D Y LiAbstract:Aluminum has found many engineering applications due to its great formability, low density and high resistance to corrosion. Since aluminum is not very strong compared to other structural materials, it is usually strengthened by introducing second phases, reinforcing particles or fibers. The objective of this work is to strengthen aluminum without decreasing its corrosion resistance. Yttria is selected as reinforcing particles. It is demonstrated that by adding yttria particles, aluminum can be strengthened with improved polarization behavior and higher resistance to Corrosive Wear in sulfuric acid and sodium chloride solutions. Microstructure of aluminum becomes finer with an increase in yttria content. However, the added yttria particles are not observed in the modified aluminum. Instead, a new phase, Al 3 Y, is formed, which may result from possible decomposition or melting of the yttria particles during an arc melting process. The improved properties of aluminum by the yttria addition may thus be attributed to the formation of Al 3 Y phase, possible residual yttrium in the Al matrix, and the resultant finer microstructure.
X Y Wang - One of the best experts on this subject based on the ideXlab platform.
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Wear and corrosion Wear of medium carbon steel and 304 stainless steel
Wear, 2006Co-Authors: Reza M Bateni, J A Szpunar, X Y WangAbstract:Abstract Wear and Corrosive Wear involve mechanical and chemical mechanisms and the combination of these mechanisms often results in significant mutual effects. In this paper, tribological behavior, X-ray peak broadening, and microstructure changes of carbon steel AISI 1045 and stainless steel AISI 304 samples under simultaneous Wear and corrosion were investigated and the results were compared with those obtained from dry Wear tests. 3.5 wt.% NaCl solution was used as the corrosion agent and a pin-on-disk tribometer was employed to perform Wear and Corrosive Wear tests. X-ray diffraction measurements have shown that by increasing the applied load, the worn surfaces of carbon steel samples reached a constant strain at which fracture and Wear occurred. Whereas in 304 stainless steel samples, by increasing the applied load, broadening of X-ray diffraction peaks was decreased. Wear tests of carbon steel and stainless steel samples have shown smaller weight losses and lower friction coefficient in the presence of Corrosive environment. Study of worn surfaces suggested that depending on Wear environment and applied load, different features of Wear mechanisms were involved.
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the effect of Wear and corrosion on internal crystalline texture of carbon steel and stainless steel
Wear, 2005Co-Authors: M R Bateni, J A Szpunar, X Y WangAbstract:Abstract Wear and corrosion Wear involve mechanical and chemical mechanisms and the combination of these mechanisms often results in significant mutual effects. In this research, Wear performances, and texture changes of carbon steel AISI 1045 and stainless steel AISI 304 under simultaneous Wear and corrosion were investigated and the results were compared with those obtained from dry Wear tests. 3.5 wt.% NaCl solution was used as the corrosion agent and a pin-on-disk tribometer was employed to perform Wear and corrosion Wear tests. Wear tests of carbon steel and stainless steel samples have shown smaller weight losses and lower friction coefficients in the presence of Corrosive environment. Texture investigations of the worn samples have shown texture changes after Wear and Corrosive Wear tests. In worn carbon steel samples after dry Wear test 〈0 1 1) 〈1 0 0〉 Goss texture and {1 1 1} gamma fiber component were developed in initially random oriented samples, whereas under Corrosive Wear conditions, {1 1 1} 〈 0 1 1 〉 fiber texture and {0 0 1} 〈 1 1 0 〉 cube texture were obtained. In stainless steel samples, {1 1 2} 〈 1 1 0 〉 texture component were observed under both dry and Corrosive Wear conditions, in initially random samples.
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Application of an electrochemical scratch technique to evaluate contributions of mechanical and electrochemical attacks to Corrosive Wear of materials
Wear, 2005Co-Authors: X Y WangAbstract:Abstract Corrosive Wear is one of the most destructive processes encountered in industry. However, how the mechanical and electrochemical actions contribute to the material removal during Corrosive Wear is still not well understood. In this work, an electrochemical scratch method was applied to study the synergic attack of Wear and corrosion to high-Cr cast iron, cast iron and mild steel in a 3.5% NaCl solution and tap water, respectively. Contributions of corrosion, Wear and corrosion-Wear synergism to the total material loss were evaluated using the technique in combination with other experiments, including polarization test, scratch profile measurement, scratch test under cathodic protection. The emphasis of the research was to evaluate how corrosion and Wear mutually affected each other, which helped to understand the synergism of corrosion and Wear for the materials. The contributions of mechanical and corrosion actions to Corrosive Wear of the materials were correlated to their mechanical and electrochemical properties. It was determined that the electrochemical scratch method was effective for investigating the synergism of Wear and corrosion.
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mechanical electrochemical and tribological properties of nano crystalline surface of 304 stainless steel
Wear, 2003Co-Authors: X Y WangAbstract:This paper reports our recent studies on the tribological behavior and related properties of a nano-crystalline surface of 304 stainless steel (304SS) produced by a sandblasting and annealing process. The grain size of the nano-crystalline surface layer was in the range of 20 nm, determined using transmission electron microscopy (TEM). Mechanical behavior, electrochemical properties, electron work function (EWF), Wear and Corrosive Wear of the nano-crystalline surface were investigated using micro- and nano-mechanical probes, a scanning Kelvin probe, an electrochemical system and a tribometer, respectively. It was demonstrated that the mechanical behavior of 304SS surface was markedly improved when its grain size was reduced to nano-scale. The nano-crystalline surface caused by the sandblasting and annealing treatment exhibited considerably higher resistance to corrosion, Wear and Corrosive Wear, compared to those of regularly grained and only sandblasted 304SS specimens. Mechanisms responsible for the improvement in mechanical, electrochemical and tribological properties of 304SS by the sandblasting and annealing treatment are discussed.
Xinping Zhang - One of the best experts on this subject based on the ideXlab platform.
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laser cladding of stainless steel with ni cr3c2 and ni wc for improving erosive Corrosive Wear performance
Surface & Coatings Technology, 2005Co-Authors: Dawei Zhang, Xinping ZhangAbstract:Abstract The microstructure and the erosive–Corrosive Wear (ECW) performance of laser-clad Ni–Cr 3 C 2 and Ni–WC coatings with overlapping clad tracks (OCT) on a 0.2% C martensitic stainless steel were investigated by scanning electron microscopy (SEM), XRD, EDX techniques and ECW testing. The coating produced by completely dissolving Cr 3 C 2 particles in laser melted pool is composed of austenite (γ) dendrites surrounded by a γ-M 7 C 3 eutectic, whereas another one is of granular solidifying structure in which contains the incompletely dissolved WC particles. The microhardness of Ni–WC coating is higher than that of Ni–Cr 3 C 2 , about 300 HV average. The main reason of microhardness difference is that two coatings have different solidified structure. The comparison of ECW tests found that the reduction of ECW rate dose not occur with the increase of hardness. The Ni–Cr 3 C 2 coating with lower hardness has a lower ECW rate with respect to the Ni–WC one. Both average ECW rate decreased by approximately 30% and 60% as compared to that of stainless steel substrate, and both coatings had different ECW mechanism. The increase of ECW resistance is closely related to structure state, kind and amount of carbides, microhardness and toughening ability of the clad layer.
Dawei Zhang - One of the best experts on this subject based on the ideXlab platform.
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laser cladding of stainless steel with ni cr3c2 and ni wc for improving erosive Corrosive Wear performance
Surface & Coatings Technology, 2005Co-Authors: Dawei Zhang, Xinping ZhangAbstract:Abstract The microstructure and the erosive–Corrosive Wear (ECW) performance of laser-clad Ni–Cr 3 C 2 and Ni–WC coatings with overlapping clad tracks (OCT) on a 0.2% C martensitic stainless steel were investigated by scanning electron microscopy (SEM), XRD, EDX techniques and ECW testing. The coating produced by completely dissolving Cr 3 C 2 particles in laser melted pool is composed of austenite (γ) dendrites surrounded by a γ-M 7 C 3 eutectic, whereas another one is of granular solidifying structure in which contains the incompletely dissolved WC particles. The microhardness of Ni–WC coating is higher than that of Ni–Cr 3 C 2 , about 300 HV average. The main reason of microhardness difference is that two coatings have different solidified structure. The comparison of ECW tests found that the reduction of ECW rate dose not occur with the increase of hardness. The Ni–Cr 3 C 2 coating with lower hardness has a lower ECW rate with respect to the Ni–WC one. Both average ECW rate decreased by approximately 30% and 60% as compared to that of stainless steel substrate, and both coatings had different ECW mechanism. The increase of ECW resistance is closely related to structure state, kind and amount of carbides, microhardness and toughening ability of the clad layer.
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the microstructure and erosive Corrosive Wear performance of laser clad ni cr3c2 composite coating
Wear, 2003Co-Authors: Dawei Zhang, T C LeiAbstract:Abstract The microstructure and erosive–Corrosive Wear (ECW) performance of laser-clad Ni–Cr 3 C 2 composite coating with overlapping clad tracks on a 0.2% C martensitic stainless steel have been investigated by means of scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive X-ray analysis, microhardness testing and ECW testing. The average microhardness of the composite coating is increased with increasing amounts of added carbide in the considered range. The complete dissolution of Cr 3 C 2 particles in the melted pool leads to carbon and chromium enrichment in the matrix, and hence causes the formation of M 7 C 3 (M: Fe, Cr) in the solidifying structures. The clad layer consists of dense austenite (γ) dendrites surrounded by a γ-M 7 C 3 eutectic. The ECW rate of the Ni–Cr 3 C 2 coating decreased by about 50% as compared to the stainless steel substrate under the condition of acid slurry contained quartz sand. It is suggested that the improvement in ECW resistance is closely related to the formation of a more ductile austenite structure and the clad layer being strengthened due to the increase of coating hardness.
Xiaoxia Jiang - One of the best experts on this subject based on the ideXlab platform.
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effects of σ phase in stainless steels on Corrosive Wear behavior in sulfuric acid
Wear, 2001Co-Authors: Xinchun Lu, Shizhuo Li, Xiaoxia JiangAbstract:Generally, compound phases in alloys are harder than matrix and act as hard particles at dry Wear condition. Such hard particles are helpful to reduce Wear rate. However, the compound phases in alloys commonly act as cathodic phases in sulfuric acid media and can be sorted into two kinds. One is the strong cathodic phase that has low corrosion potential, such as Fe3C, Cr23C6, etc; another is the weak cathodic phase that even can be oxidized in sulfuric acid media, such as intermetallic compound phase sigma. In this paper, the effects of cr phase in two kinds of stainless steels on Corrosive Wear behavior in sulfuric acid solution were investigated by using a modified Corrosive Wear tester, X-ray diffraction and scanning electron microscope, etc. Polarization curves and corrosion rates of the alloys were also measured. The results indicate that the Corrosive Wear rate decreases if there is a proper content of or phase in the alloys. Therefore, a proper content of such a kind of intermetallic compound should be considered in design for Corrosive Wear resistant alloys used in sulfuric acid media. (C) 2001 Elsevier Science B.V. All rights reserved.
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Pure mechanical Wear loss measurement in Corrosive Wear
Bulletin of Materials Science, 2000Co-Authors: Yanliang Huang, Xiaoxia JiangAbstract:The method for the measurement of the pure mechanical Wear loss for 321 stainless steel, 1045 steel and pure iron in the study of the synergy between corrosion and Wear was studied, The methods studied included the measurement in distilled water, by cathodic protection and by adding inhibitor KI, and all were compared with the Wear loss in air. The experiment showed that the pure mechanical Wear losses and friction coefficients obtained by the three methods were close to each other and can be used to calculate the various Wear components in the study of the interaction of corrosion and Wear, but the measurements in distilled water for pure iron and 1045 steel are not recommended due to their corrosion.
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effects of surface deformation on Corrosive Wear of stainless steel in sulfuric acid solution
Wear, 1999Co-Authors: Xinchun Lu, Shizhuo Li, Xiaoxia JiangAbstract:Corrosive Wear behaviors of austenitic, ferritic and duplex stainless steel in sulfuric acid solution were investigated. Transmission electron microscopy with energy dispersive X-ray, scanning electron microscopy, microhardness tester, etc, were used to study the mechanism of surface deformation of stainless steel after Corrosive Wear tests. The result indicated that the Corrosive Wear rate of austenitic stainless steel (ASS) was the highest and that of duplex stainless steel (DSS) was the lowest if the applied loads were higher than 25 N. Because martensitic transformation induced brittleness and increased corrosion rate of ASS surface, the Corrosive Wear rate of ASS increased largely though the surface microhardness of ASS was largely increased during Corrosive Wear under high loads. The Corrosive Wear fate of ferritic stainless steel (FSS) also increased largely under high loads though FSS had the best Corrosive Wear resistance under low loads. The Corrosive Wear rate of DSS had a linear relationship with loads. The abilities of surface deformation strengthening of two phases were very different. The investigation indicated that surface deformation strengthening of DSS with proper ratio of gamma phase was one of the important methods to improve Corrosive Wear resistance of stainless steel. (C) 1999 Published by Elsevier Science S.A. All rights reserved.
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the Corrosive Wear behavior of cr mn n series casting stainless steel
Wear, 1999Co-Authors: Xiaoxia JiangAbstract:Abstract The Corrosive Wear behavior of Cr–Mn–N stainless steel with additions of Cu and Mo in solutions of H2SO4, HNO3, HAC has been investigated. Its Corrosive Wear resistance is much better than that of 304 stainless steel. A new method, which can be used to indicate the Wear resistance of materials by relationship of consumed energy and scratch volume in single pendulum grooving, has been utilized. This method is simpler, quicker and allows measurement of energy dissipated in a scratching event with much limited scatter. Moreover, the tester can simulate a single event of an abrasive element's scratching with impact across a surface and magnify the event into convenient dimensions for structure or Wear mechanism. The reason why the Cr–Mn–N stainless steel has a better Corrosive Wear resistance than 304 stainless steel is that the former is more likely to engender deformation strengthening than the later except for their similar Corrosive resistance. This material can be used as product of pump and valve in Wear condition in chemical industry.
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the Corrosive Wear behavior of cr mn n series casting stainless steel
Acta Metallurgica Sinica, 1999Co-Authors: Xiaoxia JiangAbstract:The Corrosive Wear behavior of Cr-Mn-N stainless steel with additions of Cu and Mo in solutions of H2SO4, HNO3, HAC has been investigated. Its Corrosive Wear resistance is much better than that of 304 stainless steel. A new. method, which can be used to indicate the Wear resistance of materials by relationship of consumed energy and scratch volume in single pendulum grooving, has been utilized. This method is simpler, quicker and allows measurement of energy dissipated in a scratching event with much Limited scatter. Moreover, the tester can simulate a single event of an abrasive element's scratching with impact across a surface and magnify the event into convenient dimensions for structure or Wear mechanism. The reason why the Cr-Mn-N stainless steel has a better Corrosive Wear resistance than 304 stainless steel is that the former is more likely to engender deformation strengthening than the later except for their similar Corrosive resistance. This material can be used as product of pump and valve in Wear condition in chemical industry. (C) 1999 Elsevier Science S.A. All rights reserved.
