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Effect of Colloid Water Thickness on Microstructures and Mechanical Properties of Titanium/Steel Interfaces Prepared by Explosive Welding 胶体水厚度对爆炸焊接制备的钛/钢界面微观结构和机械性能的影响
IF 0.6 4区 材料科学 Q4 METALLURGY & METALLURGICAL ENGINEERING Pub Date : 2023-12-19 DOI: 10.24425/amm.2023.146194
F. Wang, M. Yang
Using colloid water as a covering for explosives can improve the energy efficiency for explosive welding, while its effects on bonding properties remain unclear. Here, by employing titanium/steel as a model system, the effect of covering thickness on microstructures and mechanical properties of the bonding interface was systematically investigated. It was found that all the welds displayed wavy interfaces, and the wave size increased with increasing covering thickness. Vortices characterized by solidified melt zones surrounded by strongly deformed parent materials, were only formed for the welds performed with a covering. Moreover, with increasing covering thickness, both the tensile strength and the elongation of the titanium/steel plate decreased, and the failure mode changed from ductile to cleavage fracture, gradually. In the tensile-shear tests, all the fractures took place in titanium matrix without separation at interface, indicating that the titanium/steel interfaces had an excellent bonding strength. The micro-hardness decreased with increasing distance from the interface, and this trend was more remarkable for a thicker covering. The micro-hardness inside the solidified melt zones was far higher than that observed in strain-hardened layers of the parent metal, due to formation of hard intermetallic compounds.
使用胶体水作为炸药的覆盖层可以提高炸药焊接的能量效率,但其对粘接性能的影响仍不明确。本文以钛/钢为模型系统,系统研究了覆盖层厚度对结合界面微观结构和机械性能的影响。研究发现,所有焊缝的界面都呈现波浪状,且波浪尺寸随覆盖层厚度的增加而增大。只有进行覆盖的焊缝才会形成涡流,其特征是凝固的熔体区被强烈变形的母体材料包围。此外,随着覆盖层厚度的增加,钛/钢板的拉伸强度和伸长率都有所下降,失效模式逐渐从韧性断裂转变为劈裂断裂。在拉伸剪切试验中,所有断裂都发生在钛基体中,没有在界面上分离,这表明钛/钢界面具有良好的结合强度。显微硬度随着与界面距离的增加而降低,这种趋势在覆盖层较厚时更为明显。由于形成了坚硬的金属间化合物,凝固熔区内部的显微硬度远高于母体金属应变硬化层的显微硬度。
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引用次数: 0
Thermodynamic Insight into the Equilibrium Component Prediction in the Al-Ti-Ca-Oxide System 铝-钛-钙-氧化物体系平衡成分预测的热力学启示
IF 0.6 4区 材料科学 Q4 METALLURGY & METALLURGICAL ENGINEERING Pub Date : 2023-12-19 DOI: 10.24425/amm.2023.146197
Yulai Song, Zhi-he Dou, Ting-an Zhang, Chu Cheng, hui Fang, Chao-Lei Ban
The prediction of equilibrium components for chemical reactions is a considerable section in the metallurgical industry. according to the ion and molecule coexistence theory (iMCT), a modified mass action concentration model based on a thermodynamic database is proposed in this paper, which complys with the law of mass conservation and can be applied in the batching process for al-Ti-Ca-oxide system that originates from ShS (Self-propagating high-temperature Synthesis) metallurgy. The trend for slag and alloy component under different batching conditions are in good agreement with experiment, while the difference between the theoretical calculation and experiment can be attributed to the deviation from the thermodynamic equilibrium. The modified mass action concentration model with melts and slag can be used to predict the composition and content of the system when equilibrium is achieved at a certain temperature under a specific material ratio, which is conducive to reducing the cost of the experiment and predicting the operability of the actual process. Moreover, it is believed that this thermodynamic insight may has certain application prospects in these metallurgical procedure based on the equilibrium process.
根据离子与分子共存理论(iMCT),本文提出了一种基于热力学数据库的修正质量作用浓度模型,该模型符合质量守恒定律,可应用于ShS(自蔓延高温合成)冶金工艺中氧化铝钛体系的配料过程。不同配料条件下熔渣和合金成分的变化趋势与实验结果吻合,而理论计算结果与实验结果之间的差异可归因于热力学平衡的偏离。修正后的熔体和熔渣质量作用浓度模型可用于预测特定物料配比下,在一定温度下达到平衡时体系的成分和含量,有利于降低实验成本,预测实际过程的可操作性。此外,相信这一热力学见解在这些基于平衡过程的冶金程序中可能具有一定的应用前景。
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引用次数: 0
Using Denture Base For Local Treatment With Vit B12 Versus Parenteral Treatment – A New Approach 使用义齿基托进行维生素 B12 局部治疗与肠外治疗--一种新方法
IF 0.6 4区 材料科学 Q4 METALLURGY & METALLURGICAL ENGINEERING Pub Date : 2023-12-19 DOI: 10.24425/amm.2023.146228
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引用次数: 0
A Review of Tensile Properties of Natural Fibres for Geotechnical Applications 岩土工程应用中天然纤维拉伸性能综述
IF 0.6 4区 材料科学 Q4 METALLURGY & METALLURGICAL ENGINEERING Pub Date : 2023-12-19 DOI: 10.24425/amm.2023.146231
N. F. YahYa, T.N.h.T. IsmaIl, F.m. Yusop, N.a.a.m. mahaNI, F. malIk, A. Sofri, J. GoNdro
Natural fibres have recently gained attention as an alternative sustainable material for civil engineering applications due to natural fibres’ exceptional performance, including high strength, and their environmental-friendliness and cost-effectiveness. however, there are disadvantages to using natural fibres in extreme environments. Therefore, this paper reviewed the effect of moisture content and temperature on the tensile strength of potential natural fibres for engineering purposes. Furthermore, this paper also critically reviewed the influence of alkaline treatment on natural fibres’ tensile strength. This is significant because alkaline treatment enhances surface friction and the fraction of the revealed cellulose on the fibres’ surface, resulting in better mechanical interlocking. In conclusion, natural fibres demonstrate their potential for geotechnical applications due to the materials’ strong tensile properties after being subjected to treatment processes.
最近,天然纤维作为土木工程应用中的一种可替代的可持续材料受到了关注,这是因为天然纤维具有包括高强度在内的优异性能,而且对环境友好,成本效益高。然而,在极端环境中使用天然纤维也有其缺点。因此,本文探讨了含水量和温度对工程用天然纤维拉伸强度的影响。此外,本文还严格审查了碱性处理对天然纤维抗拉强度的影响。这一点意义重大,因为碱性处理可增强纤维表面的摩擦力和纤维素的显露部分,从而提高机械互锁性。总之,天然纤维在经过处理工艺后具有很强的拉伸性能,这证明了其在岩土工程应用方面的潜力。
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引用次数: 0
Transient Thermal Analysis of 1U Modular Cubesat Based on Passive Thermal Control System 基于被动热控制系统的 1U 模块化立方体卫星瞬态热分析
IF 0.6 4区 材料科学 Q4 METALLURGY & METALLURGICAL ENGINEERING Pub Date : 2023-12-19 DOI: 10.24425/amm.2023.146189
S. Kubade, S. KulKarni, P. dhatraK
Cube Satellites are miniaturized satellites used for space research with a mass of not more than 1.33 kg per unit. they are widely used in space applications because of its low cost of manufacturing and flexibility of applications. Since, they use commercial off-the-shelf components, thermal consideration of internal components of 1-unit cube satellites becomes a necessity. in this paper, transient thermal analysis of a 1-unit cube satellite is conducted to analyze its behavior during the first 29 seconds of orbit insertion from the launch vehicle. transient thermal analysis yielded a temperature range that exceeded the optimum limit. as a result, to reduce heat dissipation, two main types of thermal management systems for satellites: active control and passive control systems are included. to maintain critical components at their operating temperature, a passive thermal control is implemented. thermal strap and multi-layer insulation are used to analyze internal components of 1-unit cube satellite. using graphite fiber thermal strap and aerogel multi-layer insulation for internal components, the 1-unit modular cube satellite is found to be more suitable under low earth orbit conditions.
立方体卫星是用于空间研究的微型卫星,单个质量不超过 1.33 千克。由于其制造成本低、应用灵活,因此在空间应用中得到广泛应用。本文对一颗 1 单元立方体卫星进行了瞬态热分析,以分析其在从运载火箭插入轨道的前 29 秒内的行为。因此,为了减少散热,卫星热管理系统主要包括两类:主动控制系统和被动控制系统。为了将关键部件保持在工作温度,实施了被动热控制。使用石墨纤维热绑带和多层隔热材料分析 1 单元立方体卫星的内部部件。
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引用次数: 0
Experimental Research on the Influence of Roughness of the Machined Surface of a Part on Galvanization 零件加工表面粗糙度对镀锌影响的实验研究
IF 0.6 4区 材料科学 Q4 METALLURGY & METALLURGICAL ENGINEERING Pub Date : 2023-12-19 DOI: 10.24425/amm.2023.146227
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引用次数: 0
Research on Mechanical Properties of Carbon Nanotubes (CNTs) Reinforced Cast Aluminum Alloy (ZL105) 碳纳米管 (CNT) 增强铸造铝合金 (ZL105) 的力学性能研究
IF 0.6 4区 材料科学 Q4 METALLURGY & METALLURGICAL ENGINEERING Pub Date : 2023-12-19 DOI: 10.24425/amm.2023.146196
Z. Pan, R. Li, Q. Zeng
in order to expand the application range of casting aluminum alloy ZL105, the stirring fusion casting method was used to add carbon nanotubes (CnTs) with different content and aspect ratio into the ZL105 aluminum matrix. and then the effect of the reinforcement on the mechanical properties of the alloy was compared and analyzed. The research results show that the tensile strength and hardness of the carbon nanotube composites with different contents will be improved, but to a certain extent the elongation of the composite material will be reduced, and there is an optimal addition amount. The mechanical properties of composite materials prepared by adding CnTs with relatively small length and diameter are better. There are different forms of reinforcement mechanisms for CnTs to reinforce cast aluminum alloys, and the improvement of composite material performance is the result of the combined effect of multiple strengthening methods. The research has made a meaningful exploration for the realization of carbon nanotube reinforced aluminum matrix composites under the casting method.
为了扩大铸造铝合金 ZL105 的应用范围,采用搅拌熔铸法在 ZL105 铝基体中添加了不同含量和长径比的碳纳米管(CnTs),然后比较分析了增强材料对合金力学性能的影响。研究结果表明,不同含量的碳纳米管复合材料的拉伸强度和硬度都会有所提高,但在一定程度上会降低复合材料的伸长率,而且存在一个最佳添加量。添加长度和直径相对较小的碳纳米管制备的复合材料力学性能更好。CnTs 对铸铝合金的强化机理有多种形式,复合材料性能的提高是多种强化方法共同作用的结果。该研究为实现铸造法下碳纳米管增强铝基复合材料做出了有意义的探索。
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引用次数: 0
Comparison and Analysis on the Effects of Oil-Quenching and Salt-Quenching for Carburized Gear Ring 渗碳齿轮环油淬和盐淬效果的比较与分析
IF 0.6 4区 材料科学 Q4 METALLURGY & METALLURGICAL ENGINEERING Pub Date : 2023-12-19 DOI: 10.24425/amm.2023.146191
Wang Xin, JinLong Ling
The most commonly quenching process for carburizing gears is the oil-quenching (oQ) and salt-quenching (SQ), and finite analysis and comparison of oQ and SQ on the carburizing gear ring were performed. Wherein, the accurate simulation of gear carburization was obtained by the alloying element coefficient for diffusion coefficient and experiment validation. The heat transfer coefficients measured by the inverse heat transfer method was used to the temperature simulation, and the gear distortion mechanism was analyzed by the simulated results. By the comparison of oQ, SQ had higher cooling capacity in the high temperature region and slow cooling rate in the temperature range where martensite transformation occurs. The martensite transformation was more sufficient, and the compressive stress of the tooth was greater in the SQ. The tooth showed a drum-shaped and slight saddle-shaped distortion in the oQ and SQ, respectively. The simulated distortion results have good consistency with the measured results, and the SQ distortion was more uniform and stable based on the measured results.
渗碳齿轮最常用的淬火工艺是油淬火(oQ)和盐淬火(SQ),本文对渗碳齿圈的油淬火和盐淬火进行了有限分析和比较。其中,通过扩散系数的合金元素系数和实验验证,获得了齿轮渗碳的精确模拟。利用反向传热法测得的传热系数进行温度模拟,并通过模拟结果分析了齿轮变形机理。通过对 oQ 的比较,SQ 在高温区具有较高的冷却能力,而在发生马氏体转变的温度范围内冷却速度较慢。SQ 的马氏体转变更充分,齿的压应力更大。在 oQ 和 SQ 中,齿形分别呈现鼓形和轻微的马鞍形变形。模拟变形结果与测量结果具有很好的一致性,根据测量结果,SQ 变形更为均匀和稳定。
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引用次数: 0
Characteristic of DP600 Steel Produced in Hot Rolling Process 热轧工艺生产的 DP600 钢的特性
IF 0.6 4区 材料科学 Q4 METALLURGY & METALLURGICAL ENGINEERING Pub Date : 2023-12-19 DOI: 10.24425/amm.2023.146234
T. Kaźmierski, J. KrawczyK, Ł. Frocisz
DP600 steels are characterized by a dual phase ferritic-martensitic microstructure, to which they owe their exceptionally favourable combination of high strength and good ductility. one of the production methods for this grade of steel is the hot rolling process. Despite the fact that these steels have been produced on an industrial scale for almost 40 years, they are still being studied intensively, with new research on the formation of their microstructure and properties published every year. This article focuses on the characteristics of DP600 steel produced on a hot rolling mill for applications in automotive industry. The article presents the results of mechanical properties tests and microstructure analysis of DP600 steel obtained in an industrial hot rolling process. The general characteristic of DP600 steel presented in this article, is supplemented with statistical analysis of correlations between chemical composition, selected process parameters and mechanical properties of hot rolled DP600 steel.
DP600 钢具有铁素体-马氏体双相微观结构,因此具有高强度和良好的延展性。尽管这些钢材的工业化生产已有近 40 年的历史,但对它们的研究仍在不断深入,每年都有关于其微观结构和性能形成的新研究成果发表。本文重点研究了在热轧机上生产的应用于汽车行业的 DP600 钢的特性。文章介绍了在工业热轧过程中获得的 DP600 钢的机械性能测试和微观结构分析结果。本文介绍了 DP600 钢的一般特性,并对热轧 DP600 钢的化学成分、选定工艺参数和机械性能之间的相关性进行了统计分析。
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引用次数: 0
Strain-Hardening Prediction of DP600 Steel Considering the Heterogeneous Deformation Between Ferrite and Martensite 考虑铁素体和马氏体之间异质变形的 DP600 钢应变硬化预测
IF 0.6 4区 材料科学 Q4 METALLURGY & METALLURGICAL ENGINEERING Pub Date : 2023-12-19 DOI: 10.24425/amm.2023.146222
R. Gou, W. Dan, YonG-ShenG Xu, M. Yu, TonG-Jie Li
Dual-phase steels have received extensive attention in autobody frame manufacturing due to the resulting characteristics of an interesting combination of ductile ferrite and hard martensite. Moreover, the ductile ferrite and hard martensite lead to heterogeneous deformation in the boundary between the two phases. Then, geometrically necessary dislocations (GnDs) are created to accommodate a lattice mismatch due to the deformation incompatibility of the boundary in straining. in this study, a new empirical GnD model is developed, in which the GnD density is a function of local plastic deformation; the GnD density is distributed in the phase boundary in accordance with an “S” model of material plastic strain. The boundary conditions are applied to define the parameters. The proposed model is verified with DP600 steel. The effects of the GnDs and the width between ferrite and martensite on the strain hardening of DP600 steel are evaluated.
由于双相钢具有韧性铁素体和硬质马氏体的有趣组合,因此在车身框架制造中受到广泛关注。此外,韧性铁素体和硬质马氏体会导致两相边界的异质变形。本研究建立了一个新的经验 GnD 模型,其中 GnD 密度是局部塑性变形的函数;GnD 密度按照材料塑性应变的 "S "模型分布在相边界中。应用边界条件来定义参数。用 DP600 钢验证了所提出的模型。评估了 GnDs 以及铁素体和马氏体之间的宽度对 DP600 钢应变硬化的影响。
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Archives of Metallurgy and Materials
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