The Experts below are selected from a list of 1947 Experts worldwide ranked by ideXlab platform
Jiwang Zhang - One of the best experts on this subject based on the ideXlab platform.
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Influence of solid solution strengthening on spalling behavior of Railway Wheel steel
Wear, 2017Co-Authors: Dongfang Zeng, Liantao Lu, Yanhua Gong, Yuanbin Zhang, Jiwang ZhangAbstract:The object of this paper is to investigate the influence of solid solution strengthening on the spalling behavior of Railway Wheel steel. White etching layer (WEL) was reproduced by twin-disc test and analyzed by phase transformation kinetic. Spalling of WEL was then evaluated by rolling contact fatigue (RCF) test and finite element analysis. The results show that solid solution strengthening improves the resistance to WEL formation for Wheel steel through increasing the austenitization temperature. WEL remarkably reduces the RCF life of Wheel steel. Whether containing WEL or not, solid solution strengthened steel exhibits a better rolling contact fatigue strength than the traditional Wheel steel.
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Effect of micro-inclusions on subsurface-initiated rolling contact fatigue of a Railway Wheel:
Proceedings of the Institution of Mechanical Engineers Part F: Journal of Rail and Rapid Transit, 2014Co-Authors: Dongfang Zeng, Liantao Lu, Jiwang ZhangAbstract:The objectives of this paper are to investigate the size of the maximum micro-inclusion in a Railway Wheel using ultrasonic fatigue testing and to evaluate the effect of the micro-inclusion on subsurface-initiated rolling contact fatigue of the Railway Wheel. Fatigue specimens with a large risk volume were quenched, tempered and oxynitrocarburized to increase both the strength of the matrix and the resistance to surface corrosion, which ensured that all of the specimens fractured from the internal inclusion under water cooling. The test results show that the size of the micro-inclusion obtained using the fatigue method are much larger than those obtained by a traditional surface analysis method, which means that the accuracy of the fatigue method is higher than that of the traditional method. The maximum square root of the micro-inclusion area and the maximum length of the major axis of the elliptical micro-inclusion for a full-sized Railway Wheel are estimated using the statistics of extreme values metho...
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influence of laser dispersed treatment on rolling contact wear and fatigue behavior of Railway Wheel steel
Materials & Design, 2014Co-Authors: Dongfang Zeng, Liantao Lu, Zheng-yang Li, Jiwang ZhangAbstract:The aim of this paper is to improve the rolling contact wear and fatigue resistance of ferrite-pearlite Railway Wheel steel by laser dispersed treatment. Such treatment creates isolated glazed regions on the surface layer of Railway Wheel steel, which are composed of fine martensite and retained austenite and have an average hardness of 762HV(0.3). The wear rate and rolling contact fatigue life of treated and untreated Railway Wheel steel were evaluated and compared by Amsler twin-disc testing machines in dry and lubricated condition, respectively. The test results show that laser dispersed treatment improves the rolling contact wear and fatigue resistance of Railway Wheel steel. The stable wear rate of the laser treated Railway Wheel steel is about 0.3 times that of untreated Railway Wheel steel and the average rolling contact life of treated Railway Wheel steel is about double that of the untreated steel. Further investigations show that the glazed regions suppress the plastic deformation of Railway Wheel steel. This inhibits the treated Railway Wheel steel from delamination wear and delays the formation of fatigue crack initiation.
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Influence of laser dispersed treatment on rolling contact wear and fatigue behavior of Railway Wheel steel
Materials and Design, 2014Co-Authors: Dongfang Zeng, Liantao Lu, Zheng-yang Li, Xuesong Jin, Jiwang Zhang, Minhao ZhuAbstract:The aim of this paper is to improve the rolling contact wear and fatigue resistance of ferrite-pearlite Railway Wheel steel by laser dispersed treatment. Such treatment creates isolated glazed regions on the surface layer of Railway Wheel steel, which are composed of fine martensite and retained austenite and have an average hardness of 762HV0.3. The wear rate and rolling contact fatigue life of treated and untreated Railway Wheel steel were evaluated and compared by Amsler twin-disc testing machines in dry and lubricated condition, respectively. The test results show that laser dispersed treatment improves the rolling contact wear and fatigue resistance of Railway Wheel steel. The stable wear rate of the laser treated Railway Wheel steel is about 0.3 times that of untreated Railway Wheel steel and the average rolling contact life of treated Railway Wheel steel is about double that of the untreated steel. Further investigations show that the glazed regions suppress the plastic deformation of Railway Wheel steel. This inhibits the treated Railway Wheel steel from delamination wear and delays the formation of fatigue crack initiation. © 2013 Elsevier Ltd.
Dongfang Zeng - One of the best experts on this subject based on the ideXlab platform.
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Influence of solid solution strengthening on spalling behavior of Railway Wheel steel
Wear, 2017Co-Authors: Dongfang Zeng, Liantao Lu, Yanhua Gong, Yuanbin Zhang, Jiwang ZhangAbstract:The object of this paper is to investigate the influence of solid solution strengthening on the spalling behavior of Railway Wheel steel. White etching layer (WEL) was reproduced by twin-disc test and analyzed by phase transformation kinetic. Spalling of WEL was then evaluated by rolling contact fatigue (RCF) test and finite element analysis. The results show that solid solution strengthening improves the resistance to WEL formation for Wheel steel through increasing the austenitization temperature. WEL remarkably reduces the RCF life of Wheel steel. Whether containing WEL or not, solid solution strengthened steel exhibits a better rolling contact fatigue strength than the traditional Wheel steel.
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Effect of micro-inclusions on subsurface-initiated rolling contact fatigue of a Railway Wheel:
Proceedings of the Institution of Mechanical Engineers Part F: Journal of Rail and Rapid Transit, 2014Co-Authors: Dongfang Zeng, Liantao Lu, Jiwang ZhangAbstract:The objectives of this paper are to investigate the size of the maximum micro-inclusion in a Railway Wheel using ultrasonic fatigue testing and to evaluate the effect of the micro-inclusion on subsurface-initiated rolling contact fatigue of the Railway Wheel. Fatigue specimens with a large risk volume were quenched, tempered and oxynitrocarburized to increase both the strength of the matrix and the resistance to surface corrosion, which ensured that all of the specimens fractured from the internal inclusion under water cooling. The test results show that the size of the micro-inclusion obtained using the fatigue method are much larger than those obtained by a traditional surface analysis method, which means that the accuracy of the fatigue method is higher than that of the traditional method. The maximum square root of the micro-inclusion area and the maximum length of the major axis of the elliptical micro-inclusion for a full-sized Railway Wheel are estimated using the statistics of extreme values metho...
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influence of laser dispersed treatment on rolling contact wear and fatigue behavior of Railway Wheel steel
Materials & Design, 2014Co-Authors: Dongfang Zeng, Liantao Lu, Zheng-yang Li, Jiwang ZhangAbstract:The aim of this paper is to improve the rolling contact wear and fatigue resistance of ferrite-pearlite Railway Wheel steel by laser dispersed treatment. Such treatment creates isolated glazed regions on the surface layer of Railway Wheel steel, which are composed of fine martensite and retained austenite and have an average hardness of 762HV(0.3). The wear rate and rolling contact fatigue life of treated and untreated Railway Wheel steel were evaluated and compared by Amsler twin-disc testing machines in dry and lubricated condition, respectively. The test results show that laser dispersed treatment improves the rolling contact wear and fatigue resistance of Railway Wheel steel. The stable wear rate of the laser treated Railway Wheel steel is about 0.3 times that of untreated Railway Wheel steel and the average rolling contact life of treated Railway Wheel steel is about double that of the untreated steel. Further investigations show that the glazed regions suppress the plastic deformation of Railway Wheel steel. This inhibits the treated Railway Wheel steel from delamination wear and delays the formation of fatigue crack initiation.
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Influence of laser dispersed treatment on rolling contact wear and fatigue behavior of Railway Wheel steel
Materials and Design, 2014Co-Authors: Dongfang Zeng, Liantao Lu, Zheng-yang Li, Xuesong Jin, Jiwang Zhang, Minhao ZhuAbstract:The aim of this paper is to improve the rolling contact wear and fatigue resistance of ferrite-pearlite Railway Wheel steel by laser dispersed treatment. Such treatment creates isolated glazed regions on the surface layer of Railway Wheel steel, which are composed of fine martensite and retained austenite and have an average hardness of 762HV0.3. The wear rate and rolling contact fatigue life of treated and untreated Railway Wheel steel were evaluated and compared by Amsler twin-disc testing machines in dry and lubricated condition, respectively. The test results show that laser dispersed treatment improves the rolling contact wear and fatigue resistance of Railway Wheel steel. The stable wear rate of the laser treated Railway Wheel steel is about 0.3 times that of untreated Railway Wheel steel and the average rolling contact life of treated Railway Wheel steel is about double that of the untreated steel. Further investigations show that the glazed regions suppress the plastic deformation of Railway Wheel steel. This inhibits the treated Railway Wheel steel from delamination wear and delays the formation of fatigue crack initiation. © 2013 Elsevier Ltd.
Liantao Lu - One of the best experts on this subject based on the ideXlab platform.
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Influence of solid solution strengthening on spalling behavior of Railway Wheel steel
Wear, 2017Co-Authors: Dongfang Zeng, Liantao Lu, Yanhua Gong, Yuanbin Zhang, Jiwang ZhangAbstract:The object of this paper is to investigate the influence of solid solution strengthening on the spalling behavior of Railway Wheel steel. White etching layer (WEL) was reproduced by twin-disc test and analyzed by phase transformation kinetic. Spalling of WEL was then evaluated by rolling contact fatigue (RCF) test and finite element analysis. The results show that solid solution strengthening improves the resistance to WEL formation for Wheel steel through increasing the austenitization temperature. WEL remarkably reduces the RCF life of Wheel steel. Whether containing WEL or not, solid solution strengthened steel exhibits a better rolling contact fatigue strength than the traditional Wheel steel.
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Effect of micro-inclusions on subsurface-initiated rolling contact fatigue of a Railway Wheel:
Proceedings of the Institution of Mechanical Engineers Part F: Journal of Rail and Rapid Transit, 2014Co-Authors: Dongfang Zeng, Liantao Lu, Jiwang ZhangAbstract:The objectives of this paper are to investigate the size of the maximum micro-inclusion in a Railway Wheel using ultrasonic fatigue testing and to evaluate the effect of the micro-inclusion on subsurface-initiated rolling contact fatigue of the Railway Wheel. Fatigue specimens with a large risk volume were quenched, tempered and oxynitrocarburized to increase both the strength of the matrix and the resistance to surface corrosion, which ensured that all of the specimens fractured from the internal inclusion under water cooling. The test results show that the size of the micro-inclusion obtained using the fatigue method are much larger than those obtained by a traditional surface analysis method, which means that the accuracy of the fatigue method is higher than that of the traditional method. The maximum square root of the micro-inclusion area and the maximum length of the major axis of the elliptical micro-inclusion for a full-sized Railway Wheel are estimated using the statistics of extreme values metho...
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influence of laser dispersed treatment on rolling contact wear and fatigue behavior of Railway Wheel steel
Materials & Design, 2014Co-Authors: Dongfang Zeng, Liantao Lu, Zheng-yang Li, Jiwang ZhangAbstract:The aim of this paper is to improve the rolling contact wear and fatigue resistance of ferrite-pearlite Railway Wheel steel by laser dispersed treatment. Such treatment creates isolated glazed regions on the surface layer of Railway Wheel steel, which are composed of fine martensite and retained austenite and have an average hardness of 762HV(0.3). The wear rate and rolling contact fatigue life of treated and untreated Railway Wheel steel were evaluated and compared by Amsler twin-disc testing machines in dry and lubricated condition, respectively. The test results show that laser dispersed treatment improves the rolling contact wear and fatigue resistance of Railway Wheel steel. The stable wear rate of the laser treated Railway Wheel steel is about 0.3 times that of untreated Railway Wheel steel and the average rolling contact life of treated Railway Wheel steel is about double that of the untreated steel. Further investigations show that the glazed regions suppress the plastic deformation of Railway Wheel steel. This inhibits the treated Railway Wheel steel from delamination wear and delays the formation of fatigue crack initiation.
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Influence of laser dispersed treatment on rolling contact wear and fatigue behavior of Railway Wheel steel
Materials and Design, 2014Co-Authors: Dongfang Zeng, Liantao Lu, Zheng-yang Li, Xuesong Jin, Jiwang Zhang, Minhao ZhuAbstract:The aim of this paper is to improve the rolling contact wear and fatigue resistance of ferrite-pearlite Railway Wheel steel by laser dispersed treatment. Such treatment creates isolated glazed regions on the surface layer of Railway Wheel steel, which are composed of fine martensite and retained austenite and have an average hardness of 762HV0.3. The wear rate and rolling contact fatigue life of treated and untreated Railway Wheel steel were evaluated and compared by Amsler twin-disc testing machines in dry and lubricated condition, respectively. The test results show that laser dispersed treatment improves the rolling contact wear and fatigue resistance of Railway Wheel steel. The stable wear rate of the laser treated Railway Wheel steel is about 0.3 times that of untreated Railway Wheel steel and the average rolling contact life of treated Railway Wheel steel is about double that of the untreated steel. Further investigations show that the glazed regions suppress the plastic deformation of Railway Wheel steel. This inhibits the treated Railway Wheel steel from delamination wear and delays the formation of fatigue crack initiation. © 2013 Elsevier Ltd.
Yifan Li - One of the best experts on this subject based on the ideXlab platform.
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fault detection method for Railway Wheel flat using an adaptive multiscale morphological filter
Mechanical Systems and Signal Processing, 2017Co-Authors: Yifan LiAbstract:Abstract This study explores the capacity of the morphology analysis for Railway Wheel flat fault detection. A dynamic model of vehicle systems with 56 degrees of freedom was set up along with a Wheel flat model to calculate the dynamic responses of axle box. The vehicle axle box vibration signal is complicated because it not only contains the information of Wheel defect, but also includes track condition information. Thus, how to extract the influential features of Wheels from strong background noise effectively is a typical key issue for Railway Wheel fault detection. In this paper, an algorithm for adaptive multiscale morphological filtering (AMMF) was proposed, and its effect was evaluated by a simulated signal. And then this algorithm was employed to study the axle box vibration caused by Wheel flats, as well as the influence of track irregularity and vehicle running speed on diagnosis results. Finally, the effectiveness of the proposed method was verified by bench testing. Research results demonstrate that the AMMF extracts the influential characteristic of axle box vibration signals effectively and can diagnose Wheel flat faults in real time.
Michela Faccoli - One of the best experts on this subject based on the ideXlab platform.
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An integrated model for competitive damage mechanisms assessment in Railway Wheel steels
Wear, 2020Co-Authors: Angelo Mazzu, Candida Petrogalli, Michela FaccoliAbstract:A procedure for damage assessment in Wheel-rail contact is still an open task: much work has been done for understanding failure mechanisms such as wear, cyclic plasticity and rolling contact fatigue, but only recently the competition between them has been taken into account. In this study, a numerical procedure for damage assessment of Railway Wheel steels, considering the complex interaction between various failure phenomena that can occur at the loaded region, is proposed. The procedure is based on various damage mechanism models, integrated into an overall simulation method able to take into account their reciprocal influence. The model was applied for characterizing a Railway Wheel steel (ER8 EN13262), through the elaboration of the results of rolling-sliding experiments, determining the plasticity and the wear model constants that can be used for damage assessment of real Wheels. The experiments showed that the main damage phenomenon was surface crack formation due to unidirectional plastic flow (ratcheting); in presence of water these cracks propagated causing very severe damage. A role of manganese sulphides non-metallic inclusions as preferential site for subsurface crack nucleation was observed. A quantitative evaluation of these phenomena was provided
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an integrated model for competitive damage mechanisms assessment in Railway Wheel steels
Wear, 2015Co-Authors: Angelo Mazzu, Candida Petrogalli, Michela FaccoliAbstract:Abstract A procedure for damage assessment in Wheel–rail contact is still an open task: much work has been done for understanding failure mechanisms such as wear, cyclic plasticity and Rolling Contact Fatigue, but only recently the competition between them has been taken into account. In this study, a numerical procedure for damage assessment of Railway Wheel steels, considering the complex interaction between various failure phenomena that can occur at the loaded region, is proposed. The procedure is based on various damage mechanism models, integrated into an overall simulation method able to take into account their reciprocal influence. The model was applied for characterising a Railway Wheel steel (ER8 EN13262), through the elaboration of the results of rolling–sliding experiments, determining the plasticity and the wear model constants that can be used for damage assessment of real Wheels. The experiments showed that the main damage phenomenon was surface crack formation due to unidirectional plastic flow (ratcheting); in the presence of water these cracks propagated causing very severe damage. A role of manganese sulphides non-metallic inclusions as preferential site for subsurface crack nucleation was observed. A quantitative evaluation of these phenomena was provided.
