Journal of Central South University最新文献_第7页

Strength evolution and deterioration law of cemented gangue backfill body in acid mine water 酸性矿井水中胶结煤矸石回填体的强度演变和劣化规律

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-06-24 DOI: 10.1007/s11771-024-5650-3

Yong-hui Zhao, Yu-xia Guo, Guo-rui Feng

{"title":"Strength evolution and deterioration law of cemented gangue backfill body in acid mine water","authors":"Yong-hui Zhao, Yu-xia Guo, Guo-rui Feng","doi":"10.1007/s11771-024-5650-3","DOIUrl":"https://doi.org/10.1007/s11771-024-5650-3","url":null,"abstract":"Cemented gangue backfill technology is an important backfill mining method. However, the acid mine water environment could seriously affect the strength of the cemented gangue backfill body (CGBB). In this study, CGBB specimens were placed in different environments (air, water, H2SO4 solution, and H2SO4 solution coupled with load) to test the strength, resistivity, and ultrasonic pulse velocity (UPV) of CGBB at different ages. The acoustic emission (AE) energy of the specimens during loading was monitored, and the microstructure was analyzed by scanning electron microscopy (SEM) and X-ray diffraction (XRD). Test results showed that: 1) The strength of CGBB cured in air and water gradually slowed down with age. The strength of CGBB in the H2SO4 solution was greater than that of CGBB cured in air or water in the first 90 d. The strength of CGBB under the coupling of the H2SO4 solution and load decreased more slowly with age than that of the single H2SO4 solution; 2) The resistivity and UPV had a good corresponding relationship with the strength of the CGBB. The failure modes of the CGBB after erosion were various, and the CGBB showed different AE energy characteristics at different stages of loading. The surge of AE energy could be used as a precursor to the failure of CGBB; 3) Erosion products compacted CGBB in the early stages and improved its strength. In the later stage, the CGBB cracked under the action of expansion stress and the strength decreased. Applying a 40% stress-to-strength ratio would resist the erosion of the H2SO4 solution. The research could provide a reference for the design of the corrosion resistance of CGBB.","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141510021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanical properties of cemented coal gangue–flyash backfill under coupled effects of water pressure and chloride salt erosion 水压和氯盐侵蚀耦合作用下胶结煤矸石-粉煤灰回填土的力学性能

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-06-24 DOI: 10.1007/s11771-024-5652-1

Zong-xu Li, Da-wei Yin, Hui-min Liu, Yi Tan, Xue-long Li

{"title":"Mechanical properties of cemented coal gangue–flyash backfill under coupled effects of water pressure and chloride salt erosion","authors":"Zong-xu Li, Da-wei Yin, Hui-min Liu, Yi Tan, Xue-long Li","doi":"10.1007/s11771-024-5652-1","DOIUrl":"https://doi.org/10.1007/s11771-024-5652-1","url":null,"abstract":"In paste backfill mining, cemented coal gangue-flyash backfills (CGFB) can effectively control surface subsidence. CGFBs are subjected to water pressure and chloride ion erosion in the gob. Therefore, an improved understanding of the influence of pressurized water and chloride salt erosion on the performance of CGFB is crucial for realizing effective green mining. In this study, CGFB samples were soaked in a NaCl solution at 0, 0.5, 1.5, or 3.0 MPa for 15 d. The mechanical properties of the samples and deterioration mechanisms were investigated using uniaxial compression tests, acoustic emission tests, digital speckle strain measurements, scanning electron microscopy, and X-ray diffraction. The results show that the uniaxial compressive strength (UCS) increased and then decreased with the increase of soaking pressure. When the soaking pressure increased from 0 to 1.5 MPa, the average UCS increased by 43.5%. Then, when the soaking pressure increased from 1.5 to 3.0 MPa, the average UCS decreased by 18.9%. Moreover, water pressure promotes chloride ions into the interior of CGFB and the production of Friedel’s salt. Higher water pressures-chloride salt erosion coupling increases the porosity of CGFB, with the 3.0 MPa sample showing an 8.2% increase in porosity compared to the 0 MPa sample. Thus, internal pore cracks developed and penetrated the samples, which degraded their mechanical properties and reduced their strength and compactness.","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141510023","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanism development of strength contributed by CPB with rice husk ash 含稻壳灰的 CPB 增强强度的机制

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-06-24 DOI: 10.1007/s11771-024-5648-x

Qin-li Zhang, Bin Liu, Yan Feng, Li Guo, Dao-lin Wang, Min Zhu, Yan-feng Zhang, Qiu-song Chen

引用次数: 0

Construction of dicyandiamide-coated manganese dioxide composite and its mechanism for improving zinc storage performance 双氰胺涂层二氧化锰复合材料的构建及其改善锌储存性能的机理

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-06-24 DOI: 10.1007/s11771-024-5642-3

Cui-hong Lu, Dan Du

{"title":"Construction of dicyandiamide-coated manganese dioxide composite and its mechanism for improving zinc storage performance","authors":"Cui-hong Lu, Dan Du","doi":"10.1007/s11771-024-5642-3","DOIUrl":"https://doi.org/10.1007/s11771-024-5642-3","url":null,"abstract":"Manganese dioxide (MnO2) is considered one of the most promising cathode materials for aqueous zinc-ion batteries because of its high theoretical capacity, high working voltage, and environmental friendliness. However, its severe capacity fading is caused by unstable crystal structure and manganese dissolution during discharge. Based on these reasons, dicyandiamide (DCDA) was used to coat α-MnO2 and the effect mechanism of DCDA on the electrochemical performance of α-MnO2@DCDA was systematically investigated. The results indicate that the physical confinement function of the DCDA not only improves significantly the structural stability of α-MnO2 but also inhibits dissolution of manganese during discharge. More importantly, electrostatic interaction between nitrogen atoms in DCDA and cations in electrolyte can inhibit Mn2+ dissolution during discharge and promote Mn2+ deposition during charging, effectively inhibiting the loss of manganese active material. Compared with unmodified α-MnO2 cathodes, α-MnO2@DCDA cathodes exhibit significantly improved cycling stability, with a stable capacity of 102.6 mA·h/g after 1500 cycles at a high current density of 3 A/g, with a capacity retention rate exceeding 60%. This work provides an effective way to achieve stable cycling of MnO2-based zinc-ion batteries.\u0000","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141510016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Meshing characteristic analysis of spur gear pair with tooth surface wear fault based on improved fractal method 基于改进分形法的齿面磨损故障正齿轮副网格特性分析

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-06-24 DOI: 10.1007/s11771-024-5620-9

Zi-meng Liu, Cheng Chang, Hao-dong Hu, Hui Ma, Shun-hao Zhang, Song-tao Zhao, Xiao-xu Zhang, Zhi-ke Peng

{"title":"Meshing characteristic analysis of spur gear pair with tooth surface wear fault based on improved fractal method","authors":"Zi-meng Liu, Cheng Chang, Hao-dong Hu, Hui Ma, Shun-hao Zhang, Song-tao Zhao, Xiao-xu Zhang, Zhi-ke Peng","doi":"10.1007/s11771-024-5620-9","DOIUrl":"https://doi.org/10.1007/s11771-024-5620-9","url":null,"abstract":"The three-dimensional (3D) fractal contact model of the interaction between gear teeth is established considering the actual surface morphology of gear teeth. The time-varying meshing stiffness (TVMS) model of spur gear pair is established and verified by finite element (FE) method based on the loaded tooth contact analysis (LTCA) method and considering the influence of friction between the gear teeth. The meshing characteristics and wear depth under tooth surface wear fault condition are analyzed by incorporating the Archard’s wear model, considering the effects of tooth roughness and friction. The effects of friction and fractal parameters on TVMS and wear depth are analyzed. Friction causes the TVMS at the pitch line position to mutate. The increase in friction coefficient and decrease in fractal dimension result in the increase in wear depth and the decrease in TVMS within the region where two pairs of gear teeth engage in meshing. TVMS shows partial linearity with the change of fractal dimension. The influence of fractal dimension on TVMS and wear depth becomes increasingly prominent with the progression of wear cycles, surpassing the influence of friction coefficient.","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141510026","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Corrosion behavior of as-sprayed VC-CuNiCr based coatings developed by high-velocity oxygen fuel process 通过高速氧气燃料工艺开发的 VC-CuNiCr 涂层的腐蚀行为

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-06-24 DOI: 10.1007/s11771-024-5645-0

Vikrant Singh, Anuj Bansal, Anil Kumar Singla, Vijay Kumar

{"title":"Corrosion behavior of as-sprayed VC-CuNiCr based coatings developed by high-velocity oxygen fuel process","authors":"Vikrant Singh, Anuj Bansal, Anil Kumar Singla, Vijay Kumar","doi":"10.1007/s11771-024-5645-0","DOIUrl":"https://doi.org/10.1007/s11771-024-5645-0","url":null,"abstract":"In this investigation, the high-velocity oxygen fuel (HVOF) deposition technique was implemented to administer vanadium carbide (VC) and cupronickel-chromium (CuNiCr) composite coatings onto SS316 stainless steel. The significance of this research lies in its direct relevance to addressing corrosion-related challenges in marine environments. Preceding and subsequent to the execution of electrochemical corrosion examinations within a 3.5% sodium chloride (NaCl) medium at ambient temperature, a comprehensive scrutiny of the surface topographies of both the coated and uncoated specimens was conducted through scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The outcomes manifest that the intermetallic binder composed of copper (Cu), nickel (Ni), and chromium (Cr) within the coatings undergoes deterioration under the influence of the NaCl medium, thereby inducing localized pitting corrosion phenomena across the substrate. Intriguingly, the incorporation of VC within the coating formulation conspicuously amplifies the corrosion resistance attributes of the treated surface, thereby ameliorating the occurrence of confined corrosive pits. Amidst the assortment of coatings subjected to scrutiny, the VC imbued surface attains the most favorable outcome, showcasing minimal corrosion rate of 72.38×10−3 mm/a. In contrast, the SS316 base substrate exhibits the most escalated corrosion rate calculated at 783.82×10−3 mm/a.","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141509972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Rare earth modified reduced graphene oxide reinforced AgCuTi composite brazing filler for brazing C/C composites 稀土改性还原氧化石墨烯增强银铜钛复合钎焊填料，用于钎焊 C/C 复合材料

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-06-24 DOI: 10.1007/s11771-024-5637-0

Liang Wu, Yue Li, Jin-wei Chen, Rui Zhang, Qian-kun Zhang, Yi-feng Xiao

{"title":"Rare earth modified reduced graphene oxide reinforced AgCuTi composite brazing filler for brazing C/C composites","authors":"Liang Wu, Yue Li, Jin-wei Chen, Rui Zhang, Qian-kun Zhang, Yi-feng Xiao","doi":"10.1007/s11771-024-5637-0","DOIUrl":"https://doi.org/10.1007/s11771-024-5637-0","url":null,"abstract":"In order to solve the formation of brittle compounds in brazed joints, an innovative rare earth modified reduced graphene oxide reinforced AgCuTi composite brazing filler was designed to achieve brazed joints with Ag-Cu eutectic as the main organization almost free of brittle compounds, and at the same time, the dispersion of graphene in the joint interfaces was improved. Microanalysis and discussion of the brazing fillers with and without Ce modification showed that the Ce modified reduced graphene oxide was more uniformly dispersed in the brazing fillers. The interfacial microstructures of C/C composites-C/C composites joints with and without Ce modified brazing fillers were compared, and the effect of graphene content on the organization and properties of the joints was investigated. The results showed that the shear strength of the joints was significantly enhanced by using Ce modified brazing fillers. When the graphene content was 0.5 wt.%, the average shear strength of the brazed joints obtained by using Ce modified brazing fillers was 31.82 MPa, increased by 50%.","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141509973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Grain size effect on plastic microformation behavior for Inconel 718 foils: Experiment and modeling 晶粒尺寸对 Inconel 718 薄膜塑性微变形行为的影响：实验与建模

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-06-24 DOI: 10.1007/s11771-024-5649-9

Kai-sheng Ji, Yan-xiong Liu, Yi-jun Zhang, Yan-li Song, Fei Yin, Wen-ting Wei

{"title":"Grain size effect on plastic microformation behavior for Inconel 718 foils: Experiment and modeling","authors":"Kai-sheng Ji, Yan-xiong Liu, Yi-jun Zhang, Yan-li Song, Fei Yin, Wen-ting Wei","doi":"10.1007/s11771-024-5649-9","DOIUrl":"https://doi.org/10.1007/s11771-024-5649-9","url":null,"abstract":"With the rapid development of the aerospace industry, there is an increasing demand for miniaturized parts made of Inconel 718 foils. However, the grain size effect on the plastic deformation behavior of thin sheets is significant, which considerably limits the fabrication and application of micro-components from Inconel 718. In this study, a series of uniaxial tensile tests and scanning electron microscopy experiments were conducted on Inconel 718 foils with different grain sizes to investigate the grain size effect on plastic deformation behavior. The grain size, orientation, and kernel average misorientation were characterized via electron backscatter diffraction to elucidate the deformation mechanism associated with the grain size effect. The results demonstrate that as the grain size increased, the number of grain orientations transforming into (< 2bar 32 >) gradually decreased owing to weakened grain rotation and coordination under tensile stress, leading to a significant reduction in yield strength and maximum tensile strength. Additionally, the plastic deformation within the grain interior diminished significantly, while grain boundary sliding became a prominent deformation mechanism during tension as grain size increased, resulting in decreased fracture strain and ductile fracture characteristics. Finally, a mixed material constitutive model incorporating grain size and strain was developed for microforming research on Inconel 718 foils.","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141509974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High-accuracy gravity field and gravity gradient forward modelling based on 3D vertex-centered finite-element algorithm 基于三维顶点中心有限元算法的高精度重力场和重力梯度前向建模

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-06-24 DOI: 10.1007/s11771-024-5647-y

Xiao-zhong Tong, Ya Sun, Ji-wen Huang, Jian-xin Liu

{"title":"High-accuracy gravity field and gravity gradient forward modelling based on 3D vertex-centered finite-element algorithm","authors":"Xiao-zhong Tong, Ya Sun, Ji-wen Huang, Jian-xin Liu","doi":"10.1007/s11771-024-5647-y","DOIUrl":"https://doi.org/10.1007/s11771-024-5647-y","url":null,"abstract":"Gravity anomalies generated by density non-uniformity are governed by the 3D Poisson equation. Most existing forward methods for such anomalies rely on integral techniques and cell-centered numerical approaches. Once the gravitational potential is calculated, these numerical schemes will inevitably lose high accuracy. To alleviate this problem, an accurate and efficient high-order vertex-centered finite-element scheme for simulating 3D gravity anomalies is presented. Firstly, the forward algorithm is formulated through the vertex-centered finite element with hexahedral meshes. The biconjugate gradient stabilized algorithm can solve the linear equation system combined with an incomplete LU factorization (ILU-BICSSTAB). Secondly, a high-degree Lagrange interpolating scheme is applied to achieve the first-derivate and second-derivate gravitational potential. Finally, a 3D cubic density model is used to test the accuracy of the vertex-centered finite-element algorithm, and thin vertical rectangular prisms and real example for flexibility. All numerical results indicate that our high-order vertex-centered finite-element method can provide an accurate approximation for the gravity field vector and the gravity gradient tensor. Meanwhile, compared to the cell-centered numerical algorithm, the high-order vertex-centered finite element scheme exhibits higher efficiency and accuracy in simulating 3D gravity anomalies.","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141510029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microstructure evolution and oxidation behavior of silicon-modified aluminide coatings on IN718 superalloy at 1000 °C 1000 °C 时 IN718 超合金上硅改性铝涂层的微观结构演变和氧化行为

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-06-24 DOI: 10.1007/s11771-024-5653-0

Yan-zhang Dai, Jian-peng Zou, Xiao-zhi Ning, Hong-ming Wei, Wen-yi Zhan, Fei-yang Li

{"title":"Microstructure evolution and oxidation behavior of silicon-modified aluminide coatings on IN718 superalloy at 1000 °C","authors":"Yan-zhang Dai, Jian-peng Zou, Xiao-zhi Ning, Hong-ming Wei, Wen-yi Zhan, Fei-yang Li","doi":"10.1007/s11771-024-5653-0","DOIUrl":"https://doi.org/10.1007/s11771-024-5653-0","url":null,"abstract":"Due to the increased service temperature of turbine blades, the high temperature conditions seriously deteriorate the mechanical properties of nickel-based superalloys, thus it is necessary to prepare the anti-oxidation coating. This research investigated the microstructure evolutions and oxidation behaviors of simple and silicon-modified aluminide coatings at 1000 °C for 200 h. After oxidation, serious spalling out and failure appeared due to spinal NiCr2O4 and volatile Cr3O phase formation in the IN718 superalloy. For the aluminide coating, the formation of stable α-Al2O3 oxide film significantly improved the oxidation resistance, with a mass gain of only 0.1 mg/cm2 during the oxidation of 100–200 h. The silicon-modified aluminide coating exhibited the lowest mass gain, rapidly formed stable SiO2 oxide film due to the existence of the Cr9.1Si0.9 phase and maximum grain size in the external coating, and the internal Al2O3 oxide together with the coating formed the pinning effect, effectively preventing the delamination of the oxide film. However, the formation and growth of the Ni3Si phase generated microcracks, leading to its rate of mass gain surpassing that of aluminide coating during oxidation of 100–200 h, which illustrates that effectively regulating the Si content is imperative to prolonging the service life of turbine blades.","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141510017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0