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Simulation analysis of intake transition section steel lining for hydropower station penstock 水电站进水口过渡段钢衬的仿真分析
Q4 Materials Science Pub Date : 2019-10-17 DOI: 10.1504/ijmmp.2019.10024755
W. Ma, Q. Guo, Yong Zeng
To improve the bending stiffness of steel plate structure, anchor bars and stiffeners are used to anchor the thin steel plate in the intake transition section in the concrete. In this paper, the finite element method is used to simulate the steel lining at the penstock intake transition section of hydropower station. The analysis results show that, the overall deformation of steel lining structure is small, which can meet the requirement of stiffness, the stress of steel lining structure is complex, the stress concentration at the stiffening ring is very high, the stress value of other parts is low, and the general stress value does not exceed 43.0 MPa, and the stress distribution is more uniform. The structural stress value of dam in the gate section is relatively low, through conventional reinforcement can meet the design requirements.
为了提高钢板结构的抗弯刚度,在混凝土中采用锚杆和加劲筋对薄钢板进行锚固。本文采用有限元法对水电站进气过渡段钢衬砌进行了数值模拟。分析结果表明,钢衬结构整体变形小,能满足刚度要求,钢衬结构受力复杂,加筋环处应力集中程度很高,其他部位应力值较低,一般应力值不超过43.0 MPa,应力分布较为均匀。闸段坝体结构应力值较低,通过常规加固可以满足设计要求。
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引用次数: 0
Comparison of texture evolution in low carbon steel fabricated by plane strain and multi-directional forging of the martensite starting structure 马氏体起始组织平面应变和多向锻造低碳钢组织演变的比较
Q4 Materials Science Pub Date : 2019-10-16 DOI: 10.1504/IJMMP.2019.10022997
Mahdi Saalari
It has been clarified that deformation and annealing of martensite starting structure can produce ultrafine grained structure in low carbon steel. This study aims to investigate the texture evolution and mechanical properties of samples with martensite structure deformed by two different forging processes. The martensitic steel samples were forged by plane strain compression and multi-directional forging up to the same true strain of 2. All samples were then annealed at 450 and 550°C for 30 min. It was found that the active slip systems in BCT crystalline structure of martensite acted like ferrite steel. After multi-directional forging of martensitic steel, the yield and ultimate strength greatly increased to 1278 and 1658 MPa, respectively. During annealing, in the plane strain compressed sample, the 'oriented nucleation' and in the multi-directional forged specimen, 'selective growth' theory was dominant.
研究表明,马氏体起始组织的变形和退火可以在低碳钢中产生超细晶粒组织。本研究旨在研究两种不同锻造工艺下马氏体组织试样的织构演变和力学性能。通过平面应变压缩和多向锻造将马氏体钢样品锻造至相同的真实应变2。然后将所有样品在450和550°C下退火30分钟。发现马氏体BCT晶体结构中的活性滑移系统的作用类似于铁素体钢。马氏体钢经多向锻造后,其屈服强度和极限强度分别大大提高到1278和1658MPa。在退火过程中,在平面应变压缩试样中,“定向成核”和在多向锻造试样中,以“选择性生长”理论为主。
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引用次数: 1
Asymmetric Gated Ge-Si0.7Ge0.3 nHTFET and pHTFET for Steep Subthreshold Characteristics 陡峭亚阈值特性的非对称门控Ge-Si0.7Ge0.3 nHTFET和pHTFET
Q4 Materials Science Pub Date : 2019-10-16 DOI: 10.1504/IJMMP.2019.10022985
S. Tripathi, Sobhit Saxena
The miniaturisation of transistors imposes thermal limits on MOSFET structures due to increase in leakage current and static power consumption per unit area of chip below 20 nm technology node. Tunnel FET has potential to reduce static power consumption to design below 20 nm technology within thermal limits thus increases the scope of future scaling trends. A new asymmetric Ge-Si0.7Ge0.3 hetero-junction tunnel FET (HTFET) is proposed with different oxide thickness from source and drain side. The asymmetric Ge-Si0.7Ge0.3 HTFET has steep subthreshold characteristic, low DIBL with high ION/IOFF current ratio for operating voltage less than 1V. The proposed design can be fabricated easily due to the similar lattice structure of Ge and Si. The ION/IOFF current ratio greater than 108 is achieved for gate length of 15 nm in nHTFET having Pt/HfO2 as gate contact and oxide material. The lowering of parasitic BJT effect in OFF state condition is also achieved in the same.
晶体管的小型化对MOSFET结构施加了热限制,这是由于低于20nm技术节点的每单位面积芯片的漏电流和静态功耗的增加。隧道FET有潜力在热极限内将静态功耗降低到设计低于20 nm的技术,从而增加了未来缩放趋势的范围。提出了一种新的非对称Ge-Si0.7Ge0.3异质结隧道FET(HTFET),其源极和漏极的氧化物厚度不同。非对称Ge-Si0.7Ge0.3HTFET具有陡峭的亚阈值特性,在低于1V的工作电压下具有低DIBL和高ION/IOFF电流比。由于Ge和Si的晶格结构相似,所提出的设计可以很容易地制造。在以Pt/HfO2作为栅极接触和氧化物材料的nHTFET中,对于15nm的栅极长度,实现了大于108的ION/IOFF电流比。在OFF状态条件下寄生BJT效应的降低也在相同的情况下实现。
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引用次数: 7
Modelling and simulation of a bending process for S34MnV steel S34MnV钢弯曲过程的建模与仿真
Q4 Materials Science Pub Date : 2019-08-20 DOI: 10.1504/IJMMP.2019.10023372
Zhiqiang Hu, Kaikun Wang, Yan Yang
To investigate the hot deformation behaviour of S34MnV steel, hot compression tests in different deformation conditions were done. According to the experimental data, a constitutive equation was established and a mathematical model for dynamic recrystallisation was established to predict the volume fraction of dynamic recrystallisation. To reveal the plastic deformation, the bending process for a large S34MnV marine crank was simulated by Deform-3D. The stress and strain field of the bending process was obtained and analysed based on the simulation. Finally, to study the effect of the bending process on the crank, a bending process of a crank produced with a hydropress in the factory was studied. The microstructure and mechanical properties in three different positions of the bending crank were analysed. It was concluded that the bending process would reduce the uniformity of the microstructure and mechanical properties, owing to the nonuniformity of the deformation.
为研究S34MnV钢的热变形行为,进行了不同变形条件下的热压缩试验。根据实验数据,建立了动态再结晶本构方程,建立了动态再结晶的数学模型,预测了动态再结晶的体积分数。为揭示其塑性变形,利用Deform-3D软件对大型S34MnV船用曲柄的弯曲过程进行了仿真。在仿真的基础上,得到了弯曲过程的应力场和应变场,并进行了分析。最后,为了研究弯曲过程对曲柄的影响,对工厂用液压机生产的曲柄弯曲过程进行了研究。分析了弯曲曲柄三个不同位置的显微组织和力学性能。结果表明,由于变形的不均匀性,弯曲过程会降低微观组织和力学性能的均匀性。
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引用次数: 0
Micro-structural and Interfacial Transition Zone investigation on Oil Palm Shell lightweight concrete. 油棕壳轻质混凝土的微观结构和界面过渡区研究。
Q4 Materials Science Pub Date : 2019-08-20 DOI: 10.1504/IJMMP.2019.10021545
M. Krishnamurthy, S. Vandanapu
Oil palm shell (OPS) aggregates can be used as a replacement of coarse aggregate in concrete to produce lightweight concrete. OPS is found to absorb more water compared to normal aggregate. Hence, surface treatment is carried out on OPS and the effect of water cement ratio on strength of concrete is investigated. This paper presents X-ray diffraction analysis carried out for treated and non-treated OPS (NTOPS) aggregate to find the mineralogical characteristics. Microstructural analysis and interfacial transition zone is investigated for treated and NTOPS using digital image processing or digital microscope. The results of investigation is compared with conventional concrete.
油棕壳(OPS)骨料可替代混凝土中的粗骨料生产轻质混凝土。发现OPS比普通骨料吸收更多的水。为此,对OPS进行了表面处理,并研究了水灰比对混凝土强度的影响。本文对处理后和未处理的OPS (NTOPS)骨料进行了x射线衍射分析,找出了矿物学特征。利用数字图像处理或数码显微镜对处理后和NTOPS的微观结构和界面过渡区进行了研究。研究结果与常规混凝土进行了比较。
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引用次数: 8
Effect of deposition temperature on structural, optical and electrical properties of chemically deposited thermochromic Cu2HgI4 thin films 沉积温度对化学沉积热致变色Cu2HgI4薄膜结构、光学和电学性能的影响
Q4 Materials Science Pub Date : 2019-08-20 DOI: 10.1504/IJMMP.2019.10023373
A. M. Mansour, I. M. Radaf, G. M. Mahmoud
Copper mercury tetraiodide thin films were grown by the chemical bath deposition technique at different deposition temperatures varying from 300 K to 345 K. The structural properties of the prepared Cu2HgI4 thin films show that the Cu2HgI4 films have a polycrystalline nature. The compositional analysis confirmed the nearly stoichiometric structure of the deposited Cu2HgI4 thin films. Homogeneous and regular surface morphology, including of circular-shaped grains with a size range from 31 to 46 nm, was revealed. Thermal stability and phase transition were studied by means of thermogravimetric analysis (TGA) and differential thermal analysis (DSC), respectively. The effects of deposition temperature on the optical properties and D.C. electrical conductivity of the Cu2HgI4 films have been studied. The films were found to have an indirect optical energy gap of values increases with increasing substrate temperature. The electrical conductivity increases with increasing temperature according to grain boundary trapping model.
采用化学浴沉积技术在300K至345K的不同沉积温度下生长了四碘化铜汞薄膜。所制备的Cu2HgI4薄膜的结构性能表明,Cu2HgI4薄膜具有多晶性质。成分分析证实了沉积的Cu2HgI4薄膜的近似化学计量结构。揭示了均匀和规则的表面形态,包括尺寸范围为31至46nm的圆形晶粒。分别用热重分析(TGA)和差热分析(DSC)研究了热稳定性和相变。研究了沉积温度对Cu2HgI4薄膜光学性能和直流电导率的影响。发现薄膜具有间接光学能隙,其值随着衬底温度的升高而增加。根据晶界俘获模型,电导率随温度的升高而增加。
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引用次数: 9
Structural, optical and electrical properties of CuBiS2 thin films deposited by spray pyrolysis at different deposition times 不同沉积时间喷雾热解沉积CuBiS2薄膜的结构、光学和电学性质
Q4 Materials Science Pub Date : 2019-08-20 DOI: 10.1504/IJMMP.2019.10023371
A. M. Mansour, I. M. Radaf
Reproducible and good quality copper bismuth sulphide (CuBiS2) thin layer were situated on preheated glassy slide substrates made implementing the spraying pyrolysis approach at distinctive times of spraying 15, 30, 45, and 60 min with a fixed substrate temperature 400°C. The effect of spray time on the structural, morphology, optical and electrical benefits of the CuBiS2 thin films produced by spray pyrolysis methodology were studied. The structure was studied by XRD methodology. The surface texture of the produced films was considered by SEM. The optical benefits of the CuBiS2 films were inquired working with the spectrophotometric method in which the optical transmittance and reflectance beyond a wavelength range 200-2500 nm were measured. The d.c. conductivity was studied at different temperatures for all the prepared CuBiS2 thin films.
可复制且质量良好的硫化铜铋(CuBiS2)薄层位于预热的玻璃载玻片衬底上,该衬底在固定衬底温度400°C下,在15、30、45和60分钟的不同时间采用喷雾热解方法制成。研究了喷雾时间对喷雾热解法制备的CuBiS2薄膜的结构、形貌、光学和电学性能的影响。用XRD方法对其结构进行了研究。用扫描电镜观察了所制备的CuBiS2薄膜的表面结构,用分光光度法测定了薄膜在200~2500nm波长范围外的透光率和反射率,探讨了薄膜的光学性能。研究了所制备的CuBiS2薄膜在不同温度下的直流电导率。
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引用次数: 15
Strength and microstructural characteristics evaluation of a fibre reinforced fine grained soil using Taguchi technique 用田口法评价纤维增强细粒土的强度和微观结构特征
Q4 Materials Science Pub Date : 2019-08-20 DOI: 10.1504/IJMMP.2019.10022946
Ajay Kumar, D. K. Soni
The viability of Taguchi technique to optimise the unconfined compressive strength of polypropylene fibre (PPF) reinforced cohesive soil has been investigated in this paper. Dominating factors for UCS optimisation have also been reported. Eggshell powder and sodium chloride were used to treat the soil and 7, 14 and 21 days cured specimens were tested. The samples were prepared by design of experiments produced by Taguchi technique those arranged in orthogonal arrays. Experimental results were analysed by performing analysis of variance. Finally, optimised conditions were experimentally verified. Scanning electron microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDS) results were also studied to explore the microstructural changes and elemental analysis of subjected soil. Overall the study focuses on the potential of the additives to strengthen the weak soil and Taguchi technique for engineering problems. Results obtained from this study might be used for pavement design and ground improvement during foundation works.
本文研究了田口技术优化聚丙烯纤维(PPF)增强粘性土无侧限抗压强度的可行性。还报告了UCS优化的主导因素。用蛋壳粉和氯化钠处理土壤,并对7天、14天和21天的固化样品进行测试。样品是通过田口技术生产的正交排列实验设计制备的。通过方差分析对实验结果进行分析。最后,通过实验验证了优化条件。还研究了扫描电子显微镜(SEM)和能谱仪(EDS)的结果,以探索受试土壤的微观结构变化和元素分析。总体而言,研究的重点是添加剂增强软弱土壤的潜力和田口技术解决工程问题。研究结果可用于路面设计和地基处理。
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引用次数: 4
Surface morphology analysis of AISI-D3 tool steel using rotary tool electric discharge machining process AISI-D3工具钢旋转刀具电火花加工过程的表面形貌分析
Q4 Materials Science Pub Date : 2019-08-18 DOI: 10.1504/IJMMP.2019.10023319
A. Dwivedi, S. K. Choudhury
Electric discharge machining (EDM) is one of the most prominent machining processes, which is used across the world for machining and creating intricate shapes in very hard-to-cut electrically conducting materials. This comprehensive study aims to investigate the surface modification and characterisation of thin AISI-D3 tool steel sheets and provides thorough information about the material characteristics, which are quite vital from the design and reliability point of view. The analysis shows that the average improvement in the final surface finish of the machined surface is close to 12%. In addition, the energy dispersive spectroscopy (EDS) images confirm the presence of 2.1% copper and 25.22% of carbon on the workpiece surface, showing the tool material transfer at the workpiece surface. Moreover, the scanning electron microscope (SEM) images confirm the presence of a thinner recast layer, fewer micro-cracks and very less embedding of tool material on the workpiece surface as compared to the stationary tool process.
电火花加工(EDM)是最突出的加工工艺之一,在世界各地都被用于在非常难以切割的导电材料中加工和创造复杂的形状。这项综合研究旨在研究薄AISI-D3工具钢板的表面改性和特性,并提供有关材料特性的全面信息,从设计和可靠性的角度来看,这些特性非常重要。分析表明,加工表面的最终表面光洁度的平均改善接近12%。此外,能量色散光谱(EDS)图像证实了工件表面上存在2.1%的铜和25.22%的碳,显示了工件表面的工具材料转移。此外,扫描电子显微镜(SEM)图像证实,与固定刀具工艺相比,存在更薄的重铸层、更少的微裂纹和更少的刀具材料嵌入工件表面。
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引用次数: 0
Vegetable oil quenchants: a review 植物油淬火剂综述
Q4 Materials Science Pub Date : 2019-08-18 DOI: 10.1504/IJMMP.2019.10023318
R. Otero, L. Meekisho, L. Canale, G. Totten
For thousands of years, vegetable oils have been used as cooling media to heat treat metals. However, the motivation for employing quenchants formulated with biodegradable, non-toxic and renewable base stocks has seen significant increase due to the environmental appeal to replace petroleum based quenchants. This paper presents an overview of the main aspects and characteristics of vegetable oils that directly influence their commercial application such as structure, classification, biodegradability and toxicity, quenching properties, oxidation and inhibition, and wetting. Further, some applications of vegetable oils as quenchants will be discussed here.
数千年来,植物油一直被用作热处理金属的冷却介质。然而,由于取代石油基淬火剂的环保吸引力,使用可生物降解、无毒和可再生基础原料配制的淬火剂的动机显著增加。本文概述了直接影响其商业应用的植物油的主要方面和特性,如结构、分类、生物降解性和毒性、淬火性能、氧化和抑制以及润湿。此外,植物油作为淬火剂的一些应用将在这里进行讨论。
{"title":"Vegetable oil quenchants: a review","authors":"R. Otero, L. Meekisho, L. Canale, G. Totten","doi":"10.1504/IJMMP.2019.10023318","DOIUrl":"https://doi.org/10.1504/IJMMP.2019.10023318","url":null,"abstract":"For thousands of years, vegetable oils have been used as cooling media to heat treat metals. However, the motivation for employing quenchants formulated with biodegradable, non-toxic and renewable base stocks has seen significant increase due to the environmental appeal to replace petroleum based quenchants. This paper presents an overview of the main aspects and characteristics of vegetable oils that directly influence their commercial application such as structure, classification, biodegradability and toxicity, quenching properties, oxidation and inhibition, and wetting. Further, some applications of vegetable oils as quenchants will be discussed here.","PeriodicalId":35049,"journal":{"name":"International Journal of Microstructure and Materials Properties","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49242121","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
期刊
International Journal of Microstructure and Materials Properties
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