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Mechanical, morphological and water intake behavior of Mg-Si integrated carbon hybrid composite for marine deckhouse 用于船用甲板室的镁硅集成碳混合复合材料的力学、形态和吸水性能
IF 0.8 4区 材料科学 Q3 Materials Science Pub Date : 2024-01-03 DOI: 10.3989/revmetalm.246
Amirthaiah Amala Mithin Minther Singh, Panimayam Arul Franco, Joseph Selvi Binoj, Amirthaiah Arul Shemin
The automated boat’s deckhouse is made of deforested wood and glass fiber, harming producers, fishermen, and marine life. In context, researchers are attempting to make composites from waste and replace synthetic materials with natural composites. In the present work, a Carbon/Mg/Si/polyester hybrid composite is developed as a potential replacement for wood in marine deckhouse construction. Impact, tensile, flexural, Rockwell and Brinell hardness were tested using ASTM standards, as well as weight absorption in fresh and seawater. Scanning electron microscopy (SEM), microanalysis (EDAX), Fourier-transform infrared spectroscopy (FTIR) and Raman Spectroscopy techniques were used to identify microstructure, elements, and functional groups. Thermogravimetric analysis and differential scanning calorimetry (DSC) are used to determine the thermal stability and heat intake/rejection of the hybrid composite. Novel hybrid composites with Mg-Si fillers improve the mechanical strength, adhesion, corrosion resistance, and deckhouse life span in marine environments.
自动船的甲板室由砍伐森林的木材和玻璃纤维制成,对生产者、渔民和海洋生物造成伤害。在这种情况下,研究人员正试图利用废弃物制造复合材料,并用天然复合材料取代合成材料。在本研究中,研究人员开发了一种碳/镁/硅/聚酯混合复合材料,有望替代木材用于建造海洋甲板。采用 ASTM 标准测试了冲击、拉伸、弯曲、洛氏和布氏硬度,以及在淡水和海水中的吸重。扫描电子显微镜 (SEM)、显微分析 (EDAX)、傅立叶变换红外光谱 (FTIR) 和拉曼光谱技术用于鉴定微观结构、元素和功能基团。热重分析和差示扫描量热法(DSC)用于确定混合复合材料的热稳定性和吸热/斥热。含有镁硅填料的新型混合复合材料提高了海洋环境中的机械强度、粘附性、耐腐蚀性和甲板室的使用寿命。
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引用次数: 0
Investigations on microstructure, hardness and tribological behaviour of AA7075-Al2O3 composites synthesized via stir casting route 通过搅拌铸造工艺合成的 AA7075-Al2O3 复合材料的微观结构、硬度和摩擦学特性研究
IF 0.8 4区 材料科学 Q3 Materials Science Pub Date : 2024-01-03 DOI: 10.3989/revmetalm.253
Mathusoothana Perumal Ezhilan, L. Emmanual, S. Alagarsamy, M. Meignanamoorthy
Aluminium matrix composite (AMC) materials play an important role in the field of automobile and aerospace industries due to their excellent properties. In this research, aluminium alloy (AA7075) was reinforced with alumina (Al2O3) particles to improve their hardness and tribological behaviour of the base alloy. Four composites were prepared by varying the content (4, 8 and 12 wt.%) of Al2O3 particles through the stir casting technique. The surface morphology of the proposed composites ensured the uniform distribution of Al2O3 particles into the matrix alloy. The hardness of the composite was measured using a Brinell hardness tester and the maximum value of hardness was found in the AA7075 - 8 wt.% Al2O3 composite. Hence, a tribological investigation was carried out on this AA7075 - 8 wt.% Al2O3 composite. Load (P), sliding speed (V) and sliding velocity (D) were taken as the wear parameters for conducting the experiments. A Technique for Order Preference by Similarity to Ideal Preferred Solution (TOPSIS) approach has been applied to find out the optimal conditions of parameters to obtain the lowest wear rate (WR) and the co-efficient of friction (COF). The results showed that the lowest WR and COF was obtained at ‘P’ of 15 N, ‘V’ of 1 m•s-1 and ‘D’ of 1000 m•s-1. ANOVA results revealed that ‘P’ is the factor with the most significant contribution (38.36%), followed by ‘D’ (28.32%). The worn surface morphology of the confirmation experiment specimen was investigated by SEM and the wear mechanism was reported.
铝基复合材料(AMC)因其优异的性能在汽车和航空航天领域发挥着重要作用。在这项研究中,用氧化铝(Al2O3)颗粒对铝合金(AA7075)进行了增强,以提高其硬度和基合金的摩擦学性能。通过搅拌铸造技术,改变 Al2O3 颗粒的含量(4、8 和 12 wt.%),制备了四种复合材料。拟议复合材料的表面形态确保了 Al2O3 颗粒在基体合金中的均匀分布。使用布氏硬度计测量了复合材料的硬度,发现 AA7075 - 8 wt.% Al2O3 复合材料的硬度值最大。因此,对这种 AA7075 - 8 wt.% Al2O3 复合材料进行了摩擦学研究。载荷 (P)、滑动速度 (V) 和滑动速率 (D) 被作为进行实验的磨损参数。采用与理想优选方案相似的阶次优选法(TOPSIS)找出了获得最低磨损率(WR)和摩擦系数(COF)的最佳参数条件。结果表明,"P "为 15 N、"V "为 1 m-s-1、"D "为 1000 m-s-1 时,磨损率和摩擦系数最低。方差分析结果显示,"P "是影响最大的因素(38.36%),其次是 "D"(28.32%)。通过扫描电镜研究了确认实验试样的磨损表面形态,并报告了磨损机理。
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引用次数: 0
Characterization of iron nugget produced from iron ore concentrate in a microwave oven using a biomass-based reductant 使用生物质还原剂在微波炉中从铁精矿中提取铁块的特性分析
IF 0.8 4区 材料科学 Q3 Materials Science Pub Date : 2024-01-03 DOI: 10.3989/revmetalm.250
M. Boyrazlı, Elif Aranci Öztürk, Yunus Emre Benkli, Canan Aksu Canbay
This study is concerned with the characterization of iron nuggets obtained from the reduction of an iron oxide concentrate in a microwave oven using a biomass-based reducing agent. In the experiments, the concentrate of iron ore consisting of hematite and magnetite minerals supplied from Elazig region and containing 67.29% Fe after enrichment, and as a reducing agent, tea plant wastes containing 94.68% C and 0.03% S after carbonization was used. Carbon required for the reduction of iron oxides to iron was stoichiometrically added to the concentrate with a grain size of -45 µm after its basicity ratio was adjusted. The composite pellets produced after the addition of reducing agent and flux (CaO) were subjected to reduction in a household microwave oven at different times. After the process, optimum (Fe3O4+Fe2O3)/C=1/4, basicity ratio (CaO+MgO)/(SiO2+Al2O3) =1.2 results were obtained. It was seen that the metallic part contained 96.6% Fe, 2.4% C after being separated from the slag and that the metallic phase was separated from the slag very easily. As a result of the microstructure investigations, it was found that the product obtained had similar properties to white cast iron properties.
本研究涉及使用生物质还原剂在微波炉中还原氧化铁精矿所得到的铁块的特征。在实验中,使用了来自埃拉泽格地区的由赤铁矿和磁铁矿矿物组成的铁矿精矿,富集后含铁 67.29%;作为还原剂,使用了碳化后含 C 94.68% 和 S 0.03% 的茶树废料。将铁氧化物还原成铁所需的碳按比例添加到粒度为 -45 µm 的浓缩物中,然后调整其碱度比。添加还原剂和助熔剂(氧化钙)后产生的复合球团在家用微波炉中进行不同时间的还原。经过这一过程后,得到了最佳(Fe3O4+Fe2O3)/C=1/4,碱度比(CaO+MgO)/(SiO2+Al2O3)=1.2 的结果。结果表明,从炉渣中分离出来的金属部分含有 96.6% 的 Fe 和 2.4% 的 C,而且金属相很容易从炉渣中分离出来。微观结构研究结果表明,获得的产品具有与白口铸铁相似的特性。
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引用次数: 0
Wear performance of GGG60 ductile iron rollers coated with WC-Co by electro spark deposition 通过电火花沉积法在 GGG60 球墨铸铁辊上涂覆 WC-Co 的磨损性能
IF 0.8 4区 材料科学 Q3 Materials Science Pub Date : 2024-01-03 DOI: 10.3989/revmetalm.249
M. Buğday, Mehmet Karalı, Ş. Talaş
Nodular cast irons are used in many industrial applications such as machine frames and body, rollers and engine blocks due to their higher strengths and ductility with good machinability comparable to grey cast irons. In this study, the outer surface of nodular cast irons (GGG-60) was coated with WC/Co using electro spark deposition (ESD). The aim of the study is to improve both the surface quality and wear behaviour with the coatings formed on the surface of the plastic deformation rollers, whose wear resistance decreases over the time due to high stress working conditions. Heat treatment at 950 ºC for 2 h was applied to the GGG60 specimen rollers and half of the rollers were uncoated and the other half was coated with WC-Co electrodes. The wear behaviour of the heat treated and coated surfaces was measured by ball-on-disc wear method using Al2O3 ball bearing with a diameter of 6 mm for a sliding distance of 250 m at a sliding rate of 6.5 m·s-1 under a dry condition, and using a load of 40 N. WC/Co coatings were successfully applied to rollers. In the SEM/EDS images, the presence of W, Fe, C, Co and Al elements in the coated part of the rollers and Fe, C and Al elements in the uncoated region were detected. It was concluded that Coating and heat treatment increased the wear resistance by nearly 5 times and decreased the friction coefficient by 2.13 times.
球墨铸铁的强度和延展性较高,机加工性能良好,可与灰口铸铁媲美,因此被广泛应用于机器框架和机身、轧辊和发动机缸体等工业领域。在这项研究中,使用电火花沉积(ESD)技术在球墨铸铁(GGG-60)的外表面涂覆了 WC/Co。该研究的目的是通过在塑性变形辊表面形成的涂层改善表面质量和磨损性能,因为在高应力工作条件下,塑性变形辊的耐磨性会随着时间的推移而降低。在 950 ºC 下对 GGG60 试样辊进行了 2 小时的热处理,其中一半辊未进行涂层,另一半辊涂有 WC-Co 电极。在干燥条件下,使用直径为 6 mm 的 Al2O3 滚珠轴承,以 6.5 m-s-1 的滑动速度滑动 250 米,负载为 40 N,采用盘上球磨损法测量了热处理和涂层表面的磨损情况。在 SEM/EDS 图像中,检测到辊子涂层部分存在 W、Fe、C、Co 和 Al 元素,未涂层区域存在 Fe、C 和 Al 元素。结论是,涂层和热处理使耐磨性提高了近 5 倍,摩擦系数降低了 2.13 倍。
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引用次数: 0
Optimization on the electrical discharge machining (EDM) process parameters of aged AA7075/TiC metal matrix composites 老化 AA7075/TiC 金属基复合材料的放电加工 (EDM) 工艺参数优化
IF 0.8 4区 材料科学 Q3 Materials Science Pub Date : 2024-01-03 DOI: 10.3989/revmetalm.245
Prabu Rajendran, Velmurugan Duraisamy, Ashok Raj Rajendran, Raja Velur Loganathan
The need to optimize the process parameters in Electrical Discharge Machining (EDM) for aged AA7075 Metal Matrix Composites (AAMMCs) is evident as it impacts various aspects such as mechanical properties, tool wear, surface finish, integrity, precision, accuracy, process stability, process consistency, and cost-effectiveness. In this study, aluminium alloy AA7075 was chosen as the matrix material because of the need to enhance its mechanical properties. Titanium Carbide (TiC) was chosen as the reinforcing material owing to its superior mechanical properties. Therefore, TiC holds the capability to improve the mechanical attributes of AA7075. The selection of the stir cast method for the manufacturing of AA7075/TiC (0, 4, 8, 12, and 16 wt.%) was based on its ease of fabrication, ability to achieve a uniform distribution of reinforcements, reduced susceptibility to oxidation and porosity, and improved control over the microstructure. This AA7075/12wt.%TiC MMC underwent an aging process at 520 °C for 180 min and was subsequently cooled within the furnace environment. The density of the aged and non-aged AA7075/TiC-based composites was determined through a density test using the Archimedes’ principle. Microhardness testing was conducted on the non-aged and aged AA7075-based MMCs employing a Vickers microhardness tester. Tensile strength and compressive strength of the aged and non-aged AA7075-based MMCs were determined by the usage of a universal testing machine (UTM) and a compression testing machine (CTM). The optimal combination of the manufactured AA7075/TiC MMCs was determined based on their mechanical properties. The most effective combination was identified as AA7075/12wt.%TiC MMC due to its superior values in hardness, tensile strength, compressive strength, and density compared to other combinations. The aging process aimed to enhance the mechanical properties without the need for additional reinforcements. EDAX and X-ray Diffraction Analysis (XRD) tests were employed to determine the weight percentage of the matrix and reinforcements and to identify the formation of precipitates in the AA7075/12wt.%TiC composites. The SEM equipment was utilized to verify the uniform distribution of titanium carbide in the matrix material AA7075. Optimization of EDM process parameters for aged AA7075/12wt.%TiC composite was carried out using Taguchi design-based Grey Relational Analysis (GRA). The selected input parameters for the optimization included the chromium concentration (g×l-1), current (amps) and pulse-on time (µs). The response parameters chosen for optimization were surface roughness (SR) and tool wear rate (TWR). The sequence of influencing EDM input parameters is chromium concentration, pulse on time and current. The optimized EDM process parameters were 8 g×l-1 chromium concentration, 5 amps current and 240 µs pulse on time and the corresponding response were 0.198 TWR and 1.56 SR.
老化 AA7075 金属基复合材料(AAMMC)的放电加工(EDM)工艺参数对机械性能、刀具磨损、表面光洁度、完整性、精度、准确性、工艺稳定性、工艺一致性和成本效益等多方面都有影响,因此优化其工艺参数的必要性显而易见。本研究选择 AA7075 铝合金作为基体材料,因为需要提高其机械性能。由于碳化钛 (TiC) 具有优异的机械性能,因此被选为增强材料。因此,TiC 能够改善 AA7075 的机械属性。之所以选择搅拌铸造法制造 AA7075/TiC(0、4、8、12 和 16 wt.%),是因为这种方法易于制造,能够实现增强材料的均匀分布,降低氧化和气孔的易感性,并改善对微观结构的控制。AA7075/12wt.%TiC MMC 在 520 °C 下进行了 180 分钟的老化处理,随后在炉内冷却。老化和未老化 AA7075/TiC 复合材料的密度是通过使用阿基米德原理的密度测试确定的。使用维氏硬度计对未老化和老化的 AA7075 基 MMC 进行了显微硬度测试。使用万能试验机(UTM)和压缩试验机(CTM)测定了老化和未老化 AA7075 材料的抗拉强度和抗压强度。根据机械性能,确定了 AA7075/TiC 混合材料的最佳组合。与其他组合相比,AA7075/12wt.% TiC MMC 的硬度、抗拉强度、抗压强度和密度都更高,因此被认为是最有效的组合。老化过程旨在提高机械性能,而不需要额外的增强材料。采用 EDAX 和 X 射线衍射分析 (XRD) 测试确定基体和增强材料的重量百分比,并确定 AA7075/12wt.%TiC 复合材料中沉淀物的形成。利用扫描电镜设备验证了碳化钛在基体材料 AA7075 中的均匀分布。使用基于田口设计的灰色关系分析法(GRA)对老化 AA7075/12wt.%TiC 复合材料的放电加工工艺参数进行了优化。优化所选的输入参数包括铬浓度(克×升-1)、电流(安培)和脉冲开启时间(微秒)。优化所选的响应参数为表面粗糙度(SR)和刀具磨损率(TWR)。影响放电加工输入参数的顺序是铬浓度、脉冲导通时间和电流。优化后的放电加工工艺参数为 8 g×l-1 铬浓度、5 安培电流和 240 µs 脉冲开启时间,相应的响应为 0.198 TWR 和 1.56 SR。
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引用次数: 0
Characterizing the mechanical deformation response of AHSS steels: A comparative study of cyclic plasticity models under monotonic and reversal loading 表征 AHSS 钢的机械变形响应:单调加载和反向加载下循环塑性模型的比较研究
IF 0.8 4区 材料科学 Q3 Materials Science Pub Date : 2024-01-03 DOI: 10.3989/revmetalm.251
Toros Arda Akşen, E. Esener, M. Firat
This study evaluates the performance of a user-defined combined hardening modeling method for advanced high-strength steels (AHSS) under monotonic and reversal loading conditions. The plastic behavior of TWIP980 and TRIP980 AHSS sheet metals is investigated using a cyclic plasticity modeling approach. The model incorporates an isotropic von Mises yield criterion and a single-term Chaboche nonlinear kinematic hardening rule. Monotonic and reversal loading stress-strain curves are predicted and compared with experimental results. The model accurately captured the Bauschinger effect for both materials, but it needs help to effectively model the permanent softening behavior observed in TWIP980 steel. Overall, the proposed modeling method agrees well with experimental results for monotonic loading and accurately represents the Bauschinger effect and transient behavior during reversal loading. However, better improvements are needed to capture the permanent softening behavior of TWIP980 steel.
本研究评估了用户定义的先进高强度钢 (AHSS) 在单调和反向加载条件下的组合硬化建模方法的性能。采用循环塑性建模方法研究了 TWIP980 和 TRIP980 AHSS 板材金属的塑性行为。该模型采用了各向同性的 von Mises 屈服准则和单项 Chaboche 非线性运动硬化规则。预测了单调和反向加载应力-应变曲线,并与实验结果进行了比较。该模型准确地捕捉到了两种材料的鲍辛格效应,但需要帮助才能有效地模拟 TWIP980 钢中观察到的永久软化行为。总体而言,所提出的建模方法与单调加载时的实验结果吻合良好,并准确地反映了鲍辛格效应和反向加载时的瞬态行为。然而,要捕捉 TWIP980 钢的永久软化行为,还需要更好的改进。
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引用次数: 0
Study on mechanical and micro structural properties of spin arc welding in Hastelloy C-2000 哈氏合金 C-2000 自旋弧焊的机械和微观结构特性研究
IF 0.8 4区 材料科学 Q3 Materials Science Pub Date : 2024-01-03 DOI: 10.3989/revmetalm.252
Ilavarasan Karthic Subramaniyan, Poosari Kumaravel Srividhya, Jothi Kesavan
Nickel-based Hastelloy C-2000 is widely used in the aerospace, chemical, and medicinal sectors. Investigating the potential efficacy of the spin arc welding process on Hastelloy C-2000 was the main focus of this study. In spin arc welding the centrifugal force has been obtained in the fusion zone, thus the weldbead quality increases. Weld current, rotating speed, and spin diameter are all separate parameters used in the welding procedure. The microstructural investigation was carried out using optical microscopy, X-Ray Diffraction (XRD), and field emission scanning electron microscopy (FESEM). The mechanical characteristics of the welded specimens were examined closely. Spin Arc Welding ultimate tensile strength (UTS), hardness value (HV), and impact experiments were compared to those of the Multi-pass Pulsed Current Gas Tungsten Arc welding method (MPCGTAW). In 27 tests, increasing the current and rotating speed resulted in greater penetration depth and weld height. The width of the weld was found to be a little high, with a spinning diameter of 2 mm. In comparison, samples 5 and 15 were found to have better hardness, tensile strength, and toughness, especially with suitable welding parameters such as current (120 I and 140 I), speed (1800 rpm), and spin diameter (2 mm and 3 mm). A microstructural study showed no grain segregation, contributing to the material’s increased hardness and tensile strength. The novel findings of the present study suggest that spin arc welding might be superior for various Hastelloy C-2000 connections that might have great applications in industries.
镍基哈氏合金 C-2000 广泛应用于航空航天、化工和医药领域。本研究的重点是调查哈氏合金 C-2000 旋转电弧焊接工艺的潜在功效。在旋弧焊中,熔合区获得了离心力,从而提高了焊条质量。焊接电流、旋转速度和旋转直径都是焊接过程中使用的独立参数。使用光学显微镜、X 射线衍射(XRD)和场发射扫描电子显微镜(FESEM)对微观结构进行了研究。对焊接试样的机械特性进行了仔细检查。将旋弧焊与多通脉冲电流气体钨极氩弧焊(MPCGTAW)的极限拉伸强度(UTS)、硬度值(HV)和冲击实验进行了比较。在 27 项试验中,增加电流和转速可增加熔深和焊缝高度。焊缝宽度略高,旋转直径为 2 毫米。相比之下,5 号和 15 号样品的硬度、抗拉强度和韧性更好,尤其是在电流(120 I 和 140 I)、转速(1800 转/分钟)和旋转直径(2 毫米和 3 毫米)等焊接参数合适的情况下。微观结构研究表明没有晶粒偏析,这有助于提高材料的硬度和抗拉强度。本研究的新发现表明,旋转电弧焊可能更适用于各种哈氏合金 C-2000 连接,在工业中可能会有很大的应用。
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引用次数: 0
Crack bifurcation behavior of coarse-grained copper under cyclic torsion combined with axial static loading 循环扭转和轴向静载荷作用下粗粒铜的裂纹分叉行为
IF 0.8 4区 材料科学 Q3 Materials Science Pub Date : 2023-12-20 DOI: 10.3989/revmetalm.248
Jin Yue Liu, Rong Hua Li, Ji Chen
Because the growth behaviors of fatigue cracks are crucial for the safe assessment of structural components, the crack propagation behaviors of coarse-grained copper (CG Cu) subjected to cyclic torsion combined with different axial static stresses were studied. The crack bifurcation behavior is related to the strain amplitude applied. When the strain amplitude is lower, both the type and the magnitude of axial stress have no significant effect on the direction in which the primary crack branches, which is mainly determined by the position of the maximum normal plane. However, when the strain amplitude is higher, the bifurcated crack deviates visibly from the maximum normal plane, which can be attributed to the high degree of plastic deformation and microcracks caused by slip bands along longitudinal direction.
由于疲劳裂纹的生长行为对结构部件的安全评估至关重要,因此研究了粗粒铜(CG Cu)在循环扭转和不同轴向静应力作用下的裂纹扩展行为。裂纹分叉行为与施加的应变振幅有关。当应变振幅较低时,轴向应力的类型和大小对主裂纹的分叉方向没有明显影响,主要取决于最大法平面的位置。然而,当应变幅值较高时,分叉裂纹明显偏离最大法线平面,这可能是由于塑性变形程度较高以及沿纵向的滑移带产生了微裂纹。
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引用次数: 0
Impacts of cyanide in gold mining and cyanide removal methodologies in liquid waste from gold processing 金矿开采中氰化物的影响和金矿加工废液中氰化物的去除方法
IF 0.8 4区 材料科学 Q3 Materials Science Pub Date : 2023-12-20 DOI: 10.3989/revmetalm.247
Juliana Freitas, Daniela Horta
Cyanide is used in several industries but is widely used for gold extraction due to its ability to complex and stabilize gold ions. The waste generated from this process is of great volume because of low ore grades that requires more processing areas. Also, it is highly toxic due to cyanide being a contaminant of animal life and the environment. The mining sector can recycle the effluents generated in their processes, however, this can affect the gold extraction and treatment methods. There are legal laws that define cyanide levels in effluents for disposal in water bodies. Methodologies for reaching these levels include oxidation degradation processes, physical-chemical, biological processes, adsorption, photocatalysis, among others. In this present review, the use of cyanide in gold mining and some of these methodologies for removing cyanide in effluents generated by gold processing are evaluated.
氰化物可用于多个行业,但由于其具有络合和稳定金离子的能力,被广泛用于黄金提取。由于矿石品位低,需要更多的加工区域,因此该工艺产生的废物量很大。此外,由于氰化物会污染动物和环境,因此毒性很强。矿业部门可以回收利用在加工过程中产生的废水,但这会影响黄金的提取和处理方法。有法律规定了污水中氰化物在水体中的处置水平。达到这些水平的方法包括氧化降解过程、物理化学过程、生物过程、吸附、光催化等。在本综述中,对金矿开采中氰化物的使用以及其中一些去除黄金加工过程中产生的污水中氰化物的方法进行了评估。
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引用次数: 0
Evaluation of nano mechanical properties and corrosion behavior of diffusion welded CoCrNi medium-entropy alloy (MEA) and SUS 304 stainless steel joints 评估扩散焊接钴铬镍中熵合金 (MEA) 和 SUS 304 不锈钢接头的纳米力学性能和腐蚀行为
IF 0.8 4区 材料科学 Q3 Materials Science Pub Date : 2023-12-14 DOI: 10.3989/revmetalm.244
Muhammad Samiuddin, Jinglong Li, Mudassir Farooq, J. Xiong
The study mainly focused on examining nanomechanical properties and corrosion behavior of the weld interface formed by diffusion welding of CoCrNi MEA and SUS 304 stainless steel. Three different bonding temperatures (i.e. 950 °C, 1000 °C, and 1050 °C) were utilized in producing diffusion welded joints. The influence of bonding temperatures on nanomechanical properties of the weld interface was characterized through Nanoindentation tests under various loads (i.e. 20 mN to 100 mN). Additionally, electrochemical properties of the weld interface were also examined using a 0.5 M HCl solution. Results clinched that with the increase of bonding temperature significant suppression in carbide formation occurred along with the weld interface. This instigated a reduction in nano hardness and elastic moduli which resulted in maximum elastic recovery along with the weld interface. The indentation size effect was also evident below 40 mN load after which nano hardness became stable while elastic moduli remained impervious to the change of indentation load. Furthermore, based upon electrochemical properties (i.e. Icorr, Ep, and Rp) samples welded at 1000 °C bonding temperature offered excellent corrosion resistance under 0.5M HCl environment.
该研究主要侧重于检测钴铬镍 MEA 和 SUS 304 不锈钢通过扩散焊接形成的焊接界面的纳米力学性能和腐蚀行为。在生产扩散焊接接头时采用了三种不同的焊接温度(即 950 ℃、1000 ℃ 和 1050 ℃)。通过在不同载荷(即 20 mN 至 100 mN)下进行纳米压痕测试,确定了接合温度对焊接界面纳米力学性能的影响。此外,还使用 0.5 M HCl 溶液检测了焊接界面的电化学特性。结果表明,随着焊接温度的升高,焊接界面的碳化物形成明显减少。这导致纳米硬度和弹性模量的降低,从而使焊接界面的弹性恢复最大。压痕大小效应在 40 毫牛顿载荷以下也很明显,之后纳米硬度变得稳定,而弹性模量则不受压痕载荷变化的影响。此外,根据电化学特性(即 Icorr、Ep 和 Rp),在 1000 °C 焊接温度下焊接的样品在 0.5M HCl 环境下具有优异的耐腐蚀性。
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Revista De Metalurgia
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