The Experts below are selected from a list of 30753 Experts worldwide ranked by ideXlab platform
Li Sheng Zhong - One of the best experts on this subject based on the ideXlab platform.
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A novel Iron Matrix composite fabricated by two-step in situ reaction: Microstructure, formation mechanism and mechanical properties
Journal of Alloys and Compounds, 2021Co-Authors: Haiqiang Bai, Li Sheng Zhong, Ling Kang, Junzhe WeiAbstract:Abstract The improvement of comprehensive properties including hardness, toughness, strength, and wear resistance in the steel/Iron Matrix composites, especially alleviate the inverse relationship between strength and toughness, is strongly required for various applications. Herein, we provide a new strategy, by two-step in situ reaction, to fabricate a novel Iron Matrix composite with high strength and reasonable toughness. The composite consists of a bundle-shaped Nb–NbC/Fe core-shell structure and cast Iron Matrix. Predominant features of the Nb–NbC/Fe core-shell structure include a metal Nb core and a NbC–Fe shell layer. The NbC–Fe shell layer is composed of two zones, where zone Ⅰ, near the Nb core, exhibits a NbC/α-Fe/NbC laminated structure; and zone Ⅱ, near the Matrix, exhibits a NbC–Fe dense structure. The investigation indicates that the formation of the NbC–Fe shell layer is mainly due to the concentration fluctuation of Nb and C atoms in the Fe–Nb–C ternary system during in situ reaction. The formation of NbC particles is mainly attributed to the in situ reaction of niobium atoms and carbon atoms in the liquid phase system ([Nb] + [C]→[NbC]→NbC), while the formation of Nb2C is attributed to the diffusion-type solid phase transformation driven driven by the diffusion of carbon atoms into the Nb lattice (Nb + 2C→Nb2C). In addition, the fracture toughness of the NbC/α-Fe/NbC laminated structure layer and NbC–Fe dense structure layer is evaluated to be approximately 4.6 ± 0.2 MPa m1/2 and 4.0 ± 0.1 MPa m1/2, respectively. The yield strength, ultimate compression strength, and fracture strain of the Nb–NbC/Fe core-shell rod-reinforced Iron-based composite reach 1623 MPa, 1970 MPa, and 11.3%, respectively, showing high strength and reasonable toughness compared to those of the cast Iron (420 MPa, 830 MPa and 21.8%, respectively). Thus, this work provides a new strategy for alleviate the inverse relationship between strength and toughness of Iron Matrix composite.
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In situ fabricated metal-carbide with core–shell structure for high impact-toughness Iron-Matrix composite
Materials Science and Technology, 2019Co-Authors: Li Sheng Zhong, Haiqiang Bai, Junzhe Wei, Jianlei Zhu, Jianhong PengAbstract:ABSTRACTA series of metal-carbide (Ta–TaC, Nb–NbC and W–WC) with core–shell structure for Iron-Matrix composites are fabricated by in situ solid-phase diffusion. Results show that the formation of ...
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Microstructure and Scratch Resistance of TaC Dense Ceramic Layer on an Iron Matrix
Journal of Materials Engineering and Performance, 2016Co-Authors: Na Na Zhao, Li Sheng Zhong, Hong Hua Yan, V. E. OvcharenkoAbstract:A tantalum carbide dense ceramic layer with a thickness of ~20 μm was produced on the surface of an Iron Matrix using an in situ technique. The morphology, microstructure, and phase composition of the layer were characterized by means of SEM, TEM, and XRD. The results show fairly agglomerated and uniformly sized (~200 nm) TaC particulates with a face-cantered cubic structure. The values of nano-hardness for the surface and cross section of reinforcing layer can be as high as 29.5 ± 0.6 and 26.7 ± 0.1 GPa, respectively, which were analyzed using a nano-indentation apparatus. Moreover, the scratch resistance of the layer was measured by scratch tests under a progressively increasing load of 0-100 N. A high critical load of 90.4 N is obtained. It is worthy to note that there are only cracking, slight splitting, and small flaking pits (even at the maximum load) all over the whole scratch process, namely the reinforcing layer can protect the Iron Matrix from serious abrasion effectively. In addition, the excellent scratch resistance and mechanism are discussed in detail.
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A General Process for In Situ Formation of Iron-Matrix Composites Reinforced by Carbide Ceramic
Materials Science Forum, 2016Co-Authors: Xin Wang, Li Sheng Zhong, Na Na Zhao, Vladimir E. OvcharenkoAbstract:Ceramic particles with high hardness and thermal stability can be used to fabricate in situ carbide particulate-reinforced Iron-Matrix surface composites with high macro-hardness while retaining high toughness. This paper describes a general process by which in situ carbide particulate-reinforced Iron-Matrix surface composites with hard ceramic particles are readily formed by a novel in situ synthesis process that combines an infiltration casting process with subsequent heat treatment. The basis of our approach is integrating selected plates of different alloys that can form carbide easily into a metal Matrix with a certain amount of carbon such as gray or ductile cast Iron by casting to form alloy plates reinforced Iron-Matrix surface composites. Subsequent thermal treatment of resulting composites leads to alloy elements of plate reacting to the carbon in the Matrix to form carbide particles. This approach is applicable to a wide range of materials and morphologies, and can be used in composites and machining tools, as well as in the wear-resistant component industry.
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General Process for In Situ Formation of Iron-Matrix Surface Composites Reinforced by Carbide Ceramic
Materials Science Forum, 2016Co-Authors: Xi Zhang, Li Sheng Zhong, Na Na Zhao, Vladimir E. OvcharenkoAbstract:Ceramic particles with high hardness and thermal stability can be used to fabricate in situ carbide particulate-reinforced Iron-Matrix surface composites with high macro-hardness while retaining high toughness. This paper describes a general process by which in situ carbide particulate-reinforced Iron-Matrix surface composites with hard ceramic particles are readily formed by a novel in situ synthesis process that combines an infiltration casting process with subsequent heat treatment. The basis of our approach is integrating selected plates of different alloys that can form carbide easily into a metal Matrix with a certain amount of carbon such as gray or ductile cast Iron by casting to form alloy plates reinforced Iron-Matrix surface composites. Subsequent thermal treatment of resulting composites leads to alloy elements of plate reacting to the carbon in the Matrix to form carbide particles. This approach is applicable to a wide range of materials and morphologies, and can be used in composites and machining tools, as well as in the wear-resistant component industry.
Yehua Jiang - One of the best experts on this subject based on the ideXlab platform.
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wettability and interaction mechanism for ni modified zta particles reinforced Iron Matrix composites
Journal of Alloys and Compounds, 2019Co-Authors: Yehua Jiang, Rong Zhou, Yixin HuaAbstract:Abstract The wetting behaviors of bare and Ni-modified zirconia toughened alumina (ZTA) with molten Iron Matrix have been explored by sessile drop technique and gathered to compare their wettability. Experimental results show that the wetting angles of molten 65Mn steel and high chromium cast Iron (HCCI) Matrix on bare ZTA substrates are 104.1° and 102.3°, respectively, whereas it is decreased to 83.6° and 88.2° on Ni-modified ZTA substrates. The wetting angle of HCCI Matrix on Ni plate is just 1.5° in 1 min. At high casting temperature, element Ni originated from Ni coating can diffuse into molten Fe and keep constant basically. Small amount of element Ni can react with Al2O3 on ZTA/Fe interface to form Al2NiO4. A schematic illustration of the cast-infiltration process is put forward, which indicates that Ni-modified ZTA can be wetted with molten Iron through Ni diffusion and reactive wetting. A ZTA/Al2NiO4/Fe interface layer is formed by mechanical bonding, interdiffusion and small amount of chemical reactions, to achieve composites with tight interfacial bonding strength. Besides, Ni-modified ZTA particles are prepared through electroless plating assisted with Ethaline additive and used as precursor to reinforce 65Mn steel Matrix composite by nonpressure casting infiltration method.
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The Particle Shape of WC Governing the Fracture Mechanism of Particle Reinforced Iron Matrix Composites
Materials (Basel Switzerland), 2018Co-Authors: Li Zulai, Wang Pengfei, Quan Shan, Yehua Jiang, Jun TanAbstract:In this work, tungsten carbide particles (WCp, spherical and irregular particles)-reinforced Iron Matrix composites were manufactured utilizing a liquid sintering technique. The mechanical properties and the fracture mechanism of WCp/Iron Matrix composites were investigated theoretically and experimentally. The crack schematic diagram and fracture simulation diagram of WCp/Iron Matrix composites were summarized, indicating that the micro-crack was initiated both from the interface for spherical and irregular WCp/Iron Matrix composites. However, irregular WCp had a tendency to form spherical WCp. The micro-cracks then expanded to a wide macro-crack at the interface, leading to a final failure of the composites. In comparison with the spherical WCp, the irregular WCp were prone to break due to the stress concentration resulting in being prone to generating brittle cracking. The study on the fracture mechanisms of WCp/Iron Matrix composites might provide a theoretical guidance for the design and engineering application of particle reinforced composites.
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Effects of Different Matrix on Interface and Compression Fracture Behavior of WC Particles Reinforced Iron Matrix Composites
Materials Science Forum, 2018Co-Authors: Feng Rui Chen, Quan Shan, Yehua Jiang, Ya Feng Zhang, Zhang FeiAbstract:The WC particles reinforced Iron Matrix composites were prepared by utilizing energy ball milling powder mixed and vacuum powder sintering method in this paper. The effects of two kinds of Matrix on the micro-structure, interface and fracture mechanism of the composites were studied emphatically, and it provided a theoretical guidance for the design and engineering application of particle reinforced metal Matrix composites. The results show that: in the two kinds of Matrix composites, WC particles and interface had different degree of melting, WC particles and the Matrix were metallurgical combination; ferritic Matrix composites had better compressibility than pearlite Matrix composites (1089Mpa); the fracture mode of ferrite Matrix composites was quasi-cleavage fracture and pearlite Matrix composites was pure cleavage fracture; the compressive micro-cracks of the two Matrix composites generated at the interface and expand at the interface to a broad macroscopic crack, which eventually the material fails.
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Formation mechanism and stability of the phase in the interface of tungsten carbide particles reinforced Iron Matrix composites: First principles calculations and experiments
Journal of Materials Research, 2016Co-Authors: Li Zulai, Quan Shan, Yehua Jiang, Rong Zhou, Jing FengAbstract:To study the formation mechanism and stability of the phase in the interface of tungsten carbide particles reinforced Iron Matrix composites, the composites were fabricated by spark plasma sintering (SPS) technique and combined with first-principles calculation. It was found that Fe 3 W 3 C compound was stable from the perspective of both thermodynamics and mechanical properties based on our calculations. Interfacial reaction product of tungsten carbide particles reinforced Iron Matrix composites was M 6 C. Experimental results indicated that the samples prepared by SPS did not appear interfacial reaction zone, while, interfacial reaction zone appeared for the remelted samples. With the increasing remelting temperature, the width of the interface reaction zone increased because the mutual diffusion occurred at the interface between tungsten carbide particles and Matrix. Its formation mechanism was 3Fe + 3/2W 2 C → Fe 3 W 3 C + 1/2C. Our research might provide a theoretical guidance in controlling the interface of tungsten carbide particles reinforced Iron Matrix composites.
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numerical simulation of mold filling process for high chromium cast Iron Matrix composite reinforced by zta ceramic particles
International Journal of Heat and Mass Transfer, 2015Co-Authors: Xiaoyu Chong, Yehua Jiang, Jing FengAbstract:Abstract The mold filling process of high chromium cast Iron Matrix composites reinforced by zirconia toughened alumina (ZTA) ceramic particles (referred as HCCI/ZTAP composites hereinafter) by infiltration casting were simulated using finite element analysis software in this paper. Volume of fluid (VOF) method and porous medium model were used to describe the flow phenomenon during infiltration process. Multiphase flow and heat transfer equations were solved by finite element method. The comparison between the experimental observations and simulation results indicates that the formulated model and method could provide a solution with acceptable accuracy, thus a promising tool to optimize the processing parameters. After trial calculations, the optimal parameters and pouring system were determined eventually. A complete casting without any defects was prepared at the pouring temperature of 1843 K and pouring velocity of 0.2 m/s by top filling in an enclosed gating system.
Rong Zhou - One of the best experts on this subject based on the ideXlab platform.
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wettability and interaction mechanism for ni modified zta particles reinforced Iron Matrix composites
Journal of Alloys and Compounds, 2019Co-Authors: Yehua Jiang, Rong Zhou, Yixin HuaAbstract:Abstract The wetting behaviors of bare and Ni-modified zirconia toughened alumina (ZTA) with molten Iron Matrix have been explored by sessile drop technique and gathered to compare their wettability. Experimental results show that the wetting angles of molten 65Mn steel and high chromium cast Iron (HCCI) Matrix on bare ZTA substrates are 104.1° and 102.3°, respectively, whereas it is decreased to 83.6° and 88.2° on Ni-modified ZTA substrates. The wetting angle of HCCI Matrix on Ni plate is just 1.5° in 1 min. At high casting temperature, element Ni originated from Ni coating can diffuse into molten Fe and keep constant basically. Small amount of element Ni can react with Al2O3 on ZTA/Fe interface to form Al2NiO4. A schematic illustration of the cast-infiltration process is put forward, which indicates that Ni-modified ZTA can be wetted with molten Iron through Ni diffusion and reactive wetting. A ZTA/Al2NiO4/Fe interface layer is formed by mechanical bonding, interdiffusion and small amount of chemical reactions, to achieve composites with tight interfacial bonding strength. Besides, Ni-modified ZTA particles are prepared through electroless plating assisted with Ethaline additive and used as precursor to reinforce 65Mn steel Matrix composite by nonpressure casting infiltration method.
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Formation mechanism and stability of the phase in the interface of tungsten carbide particles reinforced Iron Matrix composites: First principles calculations and experiments
Journal of Materials Research, 2016Co-Authors: Li Zulai, Quan Shan, Yehua Jiang, Rong Zhou, Jing FengAbstract:To study the formation mechanism and stability of the phase in the interface of tungsten carbide particles reinforced Iron Matrix composites, the composites were fabricated by spark plasma sintering (SPS) technique and combined with first-principles calculation. It was found that Fe 3 W 3 C compound was stable from the perspective of both thermodynamics and mechanical properties based on our calculations. Interfacial reaction product of tungsten carbide particles reinforced Iron Matrix composites was M 6 C. Experimental results indicated that the samples prepared by SPS did not appear interfacial reaction zone, while, interfacial reaction zone appeared for the remelted samples. With the increasing remelting temperature, the width of the interface reaction zone increased because the mutual diffusion occurred at the interface between tungsten carbide particles and Matrix. Its formation mechanism was 3Fe + 3/2W 2 C → Fe 3 W 3 C + 1/2C. Our research might provide a theoretical guidance in controlling the interface of tungsten carbide particles reinforced Iron Matrix composites.
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Effect of Cr addition on the microstructure and abrasive wear resistance of WC-reinforced Iron Matrix surface composites
Journal of Materials Research, 2014Co-Authors: Li Zulai, Quan Shan, Yehua Jiang, Rong Zhou, Zhihui Chen, Jun TanAbstract:Tungsten carbide (WC) particle–reinforced Iron Matrix surface composites with different content of Cr were fabricated using vacuum evaporative pattern casting technique. It was found that the morphology of carbides changed from continuous net-shape to isolated block-shape patterns. The amount of carbides increase with the increasing Cr content in the matrices. Composites with different Cr content show better abrasive wear resistance than those without Cr. With the increase of Cr content in the matrices, the three-body abrasive wear resistance of the composites increased, while the impact abrasive wear resistance of the composites increased under 1 J impact load, but first increased and then decreased under 3 J impact load. The influences of the addition of Cr in the matrices on the abrasive wear resistance were the synergistic effects of two protecting effects and two supporting effects. The results might provide significant references for the design and practical application of WC particle–reinforced Iron Matrix surface composites.
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Study on In situ Synthesis of TiC Particle Reinforced Iron Matrix Composite
Journal of Materials Engineering and Performance, 2011Co-Authors: Qihong Cen, Yehua Jiang, Rong Zhou, Jianbin WangAbstract:A casting penetration technology combined with in situ synthesis is applied to produce a TiC particle reinforced Iron Matrix composite. The interface between reaction zone and Matrix is in good quality and no defects are found. The TiC particles in the reaction zone are fine with the average size of 2-5 μm, which may be beneficial for the interface quality and reinforcing effect. Analysis shows the growth of TiC particles is mainly controlled by the diffusion of carbon atoms.
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dry three body abrasive wear behavior of wc reinforced Iron Matrix surface composites produced by v epc infiltration casting process
Wear, 2007Co-Authors: Yehua Jiang, Rong Zhou, Rongfeng ZhouAbstract:Abstract This paper fabricated tungsten carbide (WC) particles reinforced Iron Matrix surface composites on gray cast Iron substrate using vacuum evaporative pattern casting (V-EPC) infiltration process, investigated dry three-body abrasive wear resistance of the composites containing different volume fractions of WC particles, comparing with a high chromium cast Iron. The fabricated composites contained WC particles of 5, 10, 19, 27, 36, and 52 vol.%, respectively. The results in abrasive wear tests showed that, with the increase in the volume fraction of WC particles, the wear resistance of the composites first increased until reached the maximum when the volume fraction of WC was 27%, then decreased, and was 1.5–5.2 times higher than that of the high chromium cast Iron. The changes of the wear resistance of the composites with the volume fraction of WC particles and the mode of material removal in dry three-body abrasive wear condition were analyzed.
Li Zulai - One of the best experts on this subject based on the ideXlab platform.
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The Particle Shape of WC Governing the Fracture Mechanism of Particle Reinforced Iron Matrix Composites
Materials (Basel Switzerland), 2018Co-Authors: Li Zulai, Wang Pengfei, Quan Shan, Yehua Jiang, Jun TanAbstract:In this work, tungsten carbide particles (WCp, spherical and irregular particles)-reinforced Iron Matrix composites were manufactured utilizing a liquid sintering technique. The mechanical properties and the fracture mechanism of WCp/Iron Matrix composites were investigated theoretically and experimentally. The crack schematic diagram and fracture simulation diagram of WCp/Iron Matrix composites were summarized, indicating that the micro-crack was initiated both from the interface for spherical and irregular WCp/Iron Matrix composites. However, irregular WCp had a tendency to form spherical WCp. The micro-cracks then expanded to a wide macro-crack at the interface, leading to a final failure of the composites. In comparison with the spherical WCp, the irregular WCp were prone to break due to the stress concentration resulting in being prone to generating brittle cracking. The study on the fracture mechanisms of WCp/Iron Matrix composites might provide a theoretical guidance for the design and engineering application of particle reinforced composites.
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Formation mechanism and stability of the phase in the interface of tungsten carbide particles reinforced Iron Matrix composites: First principles calculations and experiments
Journal of Materials Research, 2016Co-Authors: Li Zulai, Quan Shan, Yehua Jiang, Rong Zhou, Jing FengAbstract:To study the formation mechanism and stability of the phase in the interface of tungsten carbide particles reinforced Iron Matrix composites, the composites were fabricated by spark plasma sintering (SPS) technique and combined with first-principles calculation. It was found that Fe 3 W 3 C compound was stable from the perspective of both thermodynamics and mechanical properties based on our calculations. Interfacial reaction product of tungsten carbide particles reinforced Iron Matrix composites was M 6 C. Experimental results indicated that the samples prepared by SPS did not appear interfacial reaction zone, while, interfacial reaction zone appeared for the remelted samples. With the increasing remelting temperature, the width of the interface reaction zone increased because the mutual diffusion occurred at the interface between tungsten carbide particles and Matrix. Its formation mechanism was 3Fe + 3/2W 2 C → Fe 3 W 3 C + 1/2C. Our research might provide a theoretical guidance in controlling the interface of tungsten carbide particles reinforced Iron Matrix composites.
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Effect of Cr addition on the microstructure and abrasive wear resistance of WC-reinforced Iron Matrix surface composites
Journal of Materials Research, 2014Co-Authors: Li Zulai, Quan Shan, Yehua Jiang, Rong Zhou, Zhihui Chen, Jun TanAbstract:Tungsten carbide (WC) particle–reinforced Iron Matrix surface composites with different content of Cr were fabricated using vacuum evaporative pattern casting technique. It was found that the morphology of carbides changed from continuous net-shape to isolated block-shape patterns. The amount of carbides increase with the increasing Cr content in the matrices. Composites with different Cr content show better abrasive wear resistance than those without Cr. With the increase of Cr content in the matrices, the three-body abrasive wear resistance of the composites increased, while the impact abrasive wear resistance of the composites increased under 1 J impact load, but first increased and then decreased under 3 J impact load. The influences of the addition of Cr in the matrices on the abrasive wear resistance were the synergistic effects of two protecting effects and two supporting effects. The results might provide significant references for the design and practical application of WC particle–reinforced Iron Matrix surface composites.
Haiping Hong - One of the best experts on this subject based on the ideXlab platform.
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Preparation and mechanism of active Mo–Mn metallization on ZTA particles surface and interfacial bonding of reinforced Iron Matrix composite
Ceramics International, 2020Co-Authors: Yang Qin, Lei Fan, Huahui Chen, Haiping HongAbstract:Abstract ZrO2 toughened Al2O3 particles (ZTAp) have poor wettability with Iron, and therefore some defects are easily formed at the interface between ZTAp and Iron Matrix, which may lead to material failure. This paper illustrates that the ZTAp were modified on the surface by the active Mo–Mn metallization, and thus, they were used as the reinforcing phases to prepare the Iron-Matrix composite (ZTAp/Fe composite). It is concluded that the sponge-like skeleton structure was formed on the surface of ZTAp after the metallization. The interface of ZTAp/Fe composite, which has been proved to have bearing and transitional capacity by scratch test, was formed by chemical bonding with elemental diffusion, besides mechanical bonding. The metallization mechanism of elemental diffusion can be explained by the migration of glass phase, and the elements diffusion between the interface and Iron Matrix is to form solid solution.
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Wear Behavior of ZTA Reinforced Iron Matrix Composites
Proceedings of the 7th International Conference on Fracture Fatigue and Wear, 2019Co-Authors: Lei Fan, Huahui Chen, Haiping HongAbstract:Zirconia toughened alumina particles (ZTAp), both spherical (s-ZTAp) and irregular (i-ZTAp), reinforced Iron (Fe45) Matrix composites were fabricated by vacuum sintering. The influence of ZTAp size, shape and content in the microstructure and properties was investigated as well. Sliding wear and three-body rubber wheel abrasive wear tests were conducted for the composites. For the sliding wear test, Al2O3 wheel and 200 N load force were used and for the three-body wear test, abrasive was 0.2–0.4 mm quartz sand and feeding rate 350 g/min at 130 N load force. The microstructure, phase constituent, interface bonding and morphology were analyzed by X-ray diffraction (XRD), scanning electron microscope (SEM) and related energy-dispersive X-ray spectroscopy (EDS). The results show that phase constituent of the composites consists of Fe-Cr-Ni, (Fe, Cr)7C3, FeCrB, Al2O3 and ZrO2, the interface bonding between the ZTAp and Fe45 Matrix presents non-chemical bonding. The composite with 30 vol. % ZTA particles exhibits the best wear resistance during sliding wear test. The supportive effect of Iron Matrix on ZTAp and the protective effect of ZTAp on the Iron Matrix of the composite improve wear resistance of the composites during the three-body abrasive wear process. Comparing to s-ZTAp, i-ZTAp is not easy to be pulled off due to its higher hardness and more suitable shape, therefore, i-ZTAp reinforced Iron Matrix composites show better wear resistance during the wear process.
