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Optimization and ranking of the input parameter settings of sustainable grinding using cashew nut shell liquid as cutting fluid 以腰果壳液为切削液的可持续研磨输入参数设置的优化和排序
IF 2.3 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-08-30 DOI: 10.1088/2053-1591/ad6f72
Gajesh G S Usgaonkar, Rajesh S Prabhu Gaonkar
The current work advocates the use of Cashew Nut Shell Liquid/Oil (CNSL), an oil extract of the leftover cashew nut shells, as a novel environment-friendly cutting fluid in sustainable machining operations. The tribological characteristics of CNSL obtained on a pin-on-disc tribometer are found to be better compared to the traditionally used cutting fluid. Experiments are conducted on the surface grinder with EN8 material, considering input parameters, such as cutting fluid type, grinder speed and grade, work speed, and depth of cut, with Surface Roughness (Ra) and Grinding Temperature (Temp) being the responses. Input parameter optimization is performed using Taguchi’s statistical models. A total of 36 investigative and six validation experiments are conducted, and a prediction model is proposed. When Ra and Temp are optimized simultaneously, the prediction value of Ra is 0.071 μm, and the corresponding value of Temp is 31.6 °C for which the experimental values are 0.072 μm and 32 °C respectively. This work also applies the TODIM (TOmada de Decisao Interativa Multicriterio, in the Portuguese language), a multi-attribute decision-making method for ranking the input parameter settings. The study reveals that the performance of CNSL is better than that of a traditional cutting fluid, and the TODIM method can be successfully applied to rank the input parameter settings.
腰果壳油是一种从剩余腰果壳中提取的油脂,目前的研究倡导在可持续加工操作中使用腰果壳油作为新型环保切削液。在针盘摩擦磨损计上获得的腰果壳油的摩擦学特性优于传统使用的切削液。实验在使用 EN8 材料的平面磨床上进行,考虑了切削液类型、磨床速度和等级、工作速度和切削深度等输入参数,并以表面粗糙度(Ra)和磨削温度(Temp)作为响应。输入参数优化采用田口统计模型。共进行了 36 次调查实验和 6 次验证实验,并提出了一个预测模型。当同时优化 Ra 和温度时,Ra 的预测值为 0.071 μm,相应的温度值为 31.6 °C,而实验值分别为 0.072 μm 和 32 °C。这项研究还应用了多属性决策方法 TODIM(TOmada de Decisao Interativa Multicriterio,葡萄牙语)对输入参数设置进行排序。研究结果表明,CNSL 的性能优于传统切削液,而且 TODIM 方法可成功用于对输入参数设置进行排序。
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引用次数: 0
Effect of tempering process on the mechanical properties and corrosion resistance of E690 marine steel 回火工艺对 E690 船用钢机械性能和耐腐蚀性的影响
IF 2.3 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-08-30 DOI: 10.1088/2053-1591/ad719e
Zhimin Liu, Kuijun Fu, Zhen Xu, Jiaji Wang, Ming Zhao, Dong Wang
To accurately replicate actual production and save production costs, this study examines the influence of the tempering process on the structure, mechanical properties, and corrosion resistance of E690 marine steel. Various techniques were employed to evaluate its properties, behavior, and performance, including metallurgical microscopy, scanning electron microscopy, transmission electron microscopy, electron backscatter diffraction, impact experiments, tensile tests, and electrochemical corrosion tests. The results indicate that as the tempering temperature increases, the tempering degree of the tempered martensite structure improves, the martensite strip coarsens, the size of the precipitated carbide increases, and the proportion of large-angle grain boundaries decreases. Consequently, the tensile strength and yield strength initially increase and then decrease, while the impact toughness and elongation gradually improve. At a tempering temperature of 600 °C, the steel exhibits the best overall mechanical properties, with a tensile strength of 729 MPa, yield strength of 649 MPa, and elongation of 18%. Furthermore, at a tempering temperature of 550 °C, the test steel shows an optimal corrosion resistance, with a corrosion rate of 0.03233 mm y−1 and an open-circuit potential of −0.36 V.
为了精确复制实际生产并节约生产成本,本研究探讨了回火工艺对 E690 船用钢的结构、机械性能和耐腐蚀性能的影响。研究采用了多种技术来评估其特性、行为和性能,包括金相显微镜、扫描电子显微镜、透射电子显微镜、电子反向散射衍射、冲击实验、拉伸试验和电化学腐蚀试验。结果表明,随着回火温度的升高,回火马氏体结构的回火程度提高,马氏体条粗化,析出的碳化物尺寸增大,大角度晶界比例降低。因此,抗拉强度和屈服强度先升高后降低,而冲击韧性和伸长率则逐渐提高。回火温度为 600 ℃ 时,钢的整体机械性能最佳,抗拉强度为 729 兆帕,屈服强度为 649 兆帕,伸长率为 18%。此外,在 550 °C 的回火温度下,试验钢材显示出最佳的耐腐蚀性,腐蚀速率为 0.03233 mm y-1,开路电位为 -0.36 V。
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引用次数: 0
Synergistic effects of steel fiber and rubberized aggregates on concrete properties 钢纤维和橡胶集料对混凝土性能的协同效应
IF 2.3 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-08-29 DOI: 10.1088/2053-1591/ad6f6f
Belay Bayu Tefera, Abrham Gebre Tarekegn, Tsagazeab Yimer Ejigu
The drive for more sustainable and environmentally friendly construction practices has resulted in revolutionary concrete production methods. One way is to include scrap rubber tires (contributing significantly to environmental pollution) into concrete mixtures to increase deformability. This study investigates the impact of surface-treated waste tire rubber (which partially replaces natural coarse aggregates with 5%, 10%, and 15% by weight) and industrial steel fiber (as reinforcement by including 0.5, 1, and 1.5% volume fractions) in concrete. Twelve concrete mixtures were prepared as test specimens. The replacement percentage was then determined using the compressive strength test results for additional surface treatment with three different alkaline solution (NaOH) concentrations (5%, 10%, and 15%) for 72 h. Thus, the hardened concrete properties were analyzed using compressive strength, flexural strength, and toughness; whereas the fresh qualities of equivalent concrete mixtures were evaluated using concrete slump. The findings revealed that, while partial replacement had a negative impact on the mechanical properties of the concrete, it was possible to produce rubberized concrete with better mechanical properties than conventional concrete when the partial replacement was less than 5%, treated with 10% alkaline solution, and reinforced with 1.5% steel fibers. The study’s findings illustrate the potential of these combinations for use in concrete pavement and slab applications.
随着人们对可持续发展和环保型建筑的追求,混凝土生产方法也发生了革命性的变化。其中一种方法是在混凝土混合物中加入废旧橡胶轮胎(会对环境造成严重污染),以增加混凝土的变形能力。本研究调查了经过表面处理的废轮胎橡胶(以 5%、10% 和 15%的重量部分替代天然粗骨料)和工业钢纤维(作为加固材料,体积分数分别为 0.5%、1% 和 1.5%)对混凝土的影响。我们制备了 12 种混凝土混合物作为试验样本。然后使用抗压强度测试结果来确定替代比例,再用三种不同浓度的碱性溶液(NaOH)(5%、10% 和 15%)进行 72 小时的表面处理。因此,硬化混凝土的性能是通过抗压强度、抗折强度和韧性来分析的;而等效混凝土混合物的新拌质量则是通过混凝土坍落度来评估的。研究结果表明,虽然部分置换对混凝土的力学性能有负面影响,但当部分置换小于 5%、用 10% 的碱性溶液处理并用 1.5% 的钢纤维加固时,可以生产出力学性能优于传统混凝土的橡胶混凝土。研究结果说明了这些组合在混凝土路面和板块应用中的潜力。
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引用次数: 0
Mechanical and microstructural characterization of sustainable concrete containing recycled concrete and waste rubber tire fiber 含有再生混凝土和废旧橡胶轮胎纤维的可持续混凝土的力学和微结构表征
IF 2.3 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-08-29 DOI: 10.1088/2053-1591/ad7014
Aneel Manan, Pu Zhang, Wael Alattyih, Hani Alanazi, S K Elagan, Jawad Ahmad
The production of cement, which is the key ingredient of concrete, leads to environmental pollution by releasing massive amounts of CO2 and using significant natural resources. Therefore, shifting towards sustainable and greener materials is essential for mitigating these challenges. In this study, recycled concrete powder (RCP) was used as a cement replacement (0%, 5.0%, 10%, and 15%), solving the waste dumps issue and promoting sustainability. Furthermore, the concrete is also reinforced with steel fibers which were obtained from waste rubber tires to improve concrete tensile strength. The concrete properties were evaluated through slump cone test, compressive strength, failure patterns, tensile strength, scanning electronic microscopy, and FTIR analysis. The results indicate that the concrete strength properties improved with the substitution of RCP. The compressive and tensile strength of the optimum mix (10% RCP and 2.0% addition of steel fibers) are 15.8% and 23% more than those of reference concrete. However, the concrete flow is adversely impacted due to RCP angular particle shapes. Failure patterns indicate that RCP and steel fibers improved concrete ductility. SEM and FTIR analysis indicate microstructural improvement with RCP and steel fibers. Finally, the analysis concluded that the developed concrete showed better performance, solved waste dumps issues, and promoted sustainability.
水泥是混凝土的主要成分,其生产过程会释放大量二氧化碳并消耗大量自然资源,从而导致环境污染。因此,转向使用可持续的绿色材料对于缓解这些挑战至关重要。在这项研究中,使用了再生混凝土粉(RCP)作为水泥替代物(0%、5.0%、10% 和 15%),从而解决了垃圾堆放问题,促进了可持续发展。此外,还使用从废旧橡胶轮胎中提取的钢纤维对混凝土进行加固,以提高混凝土的抗拉强度。通过坍落度锥试验、抗压强度、破坏形态、拉伸强度、扫描电子显微镜和傅立叶变换红外分析,对混凝土性能进行了评估。结果表明,添加 RCP 后,混凝土的强度性能得到了改善。最佳混合料(10% 的 RCP 和 2.0% 的钢纤维添加量)的抗压强度和抗拉强度分别比参考混凝土高出 15.8% 和 23%。然而,由于 RCP 的角状颗粒形状,混凝土的流动性受到了不利影响。破坏形态表明 RCP 和钢纤维改善了混凝土的延展性。扫描电镜和傅立叶变换红外分析表明,RCP 和钢纤维改善了微观结构。最后,分析得出结论,开发的混凝土性能更好,解决了废物倾倒问题,促进了可持续发展。
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引用次数: 0
The effect of ion implantation dose on the friction and corrosion performance of titanium-coated magnesium alloy 离子注入剂量对钛涂层镁合金摩擦和腐蚀性能的影响
IF 2.3 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-08-29 DOI: 10.1088/2053-1591/ad71a0
Zhongyu DOU, Shupeng Luo, Dianxi Zhang
To enhance the performance of titanium plated coating on the surface of magnesium alloy AZ31, this study investigates the influence of N ion implantation dose on the structure, mechanical properties, and friction corrosion behavior of Ti film. The results reveal that N ion implantation leads to the formation of a new physical phase TiN and induces surface softening. However, with an increase in N ion implantation dose, microhardness of the Ti film increases due to the formation of TiN which enhances its hardness. Friction and wear experiments demonstrate that at maximum implantation dose, the coating exhibits minimal friction coefficient; however, an implantation dose of 5 × 1015 ion cm−2 offers superior wear resistance. The electrochemical test results indicate the corrosion current density and self-corrosion potential of Ti coating decrease with the increase of implantation dose due to the formation of nitride and the presence of N element, and corrosion resistance of the modified coating has been significantly enhanced. The research results provide reference for improving the protection performance of Ti coating on magnesium alloy surface.
为了提高镁合金 AZ31 表面镀钛涂层的性能,本研究探讨了 N 离子注入剂量对钛膜结构、机械性能和摩擦腐蚀行为的影响。结果表明,N 离子植入会导致形成新的物理相 TiN 并引起表面软化。然而,随着 N 离子注入剂量的增加,Ti 膜的显微硬度会增加,这是由于 TiN 的形成提高了其硬度。摩擦和磨损实验表明,在最大植入剂量下,涂层的摩擦系数最小;然而,植入剂量为 5 × 1015 离子 cm-2 时,耐磨性更优。电化学测试结果表明,由于氮化物的形成和 N 元素的存在,Ti 涂层的腐蚀电流密度和自腐蚀电位随植入剂量的增加而降低,改性涂层的耐腐蚀性能显著增强。研究结果为提高镁合金表面 Ti 涂层的防护性能提供了参考。
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引用次数: 0
Aloe vera-synthesized Ag nanoparticles loaded on PVA/chitosan as biodegradable and antibacterial film for food storage 芦荟合成的 Ag 纳米粒子负载在 PVA/ 壳聚糖上,可作为生物降解和抗菌薄膜用于食品储存
IF 2.3 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-08-29 DOI: 10.1088/2053-1591/ad6ff8
Nhung Thi Tran
We have developed a novel, eco-friendly, and active food packaging film by incorporating green-synthesized silver nanoparticles (AgNPs) into polyvinyl alcohol (PVA) and chitosan matrices. The AgNPs were in situ and green synthesized in high-yield by using Aloe vera extract as a reducing agent and chitosan as a stabilizing agent at high temperature. The obtained AgNPs exhibit quasi-spherical shapes and tunable size in the range 20 ∼ 30 nm by controlling the content of AgNO3 precursor in the growth solution. The in situ synthesis enables the homogeneous distribution of AgNPs throughout the films and eliminates the need for purification. The effect of the loaded amounts of Aloe vera-synthesized AgNPs on the film characteristics was investigated. The results show that the obtained AgNPs-loaded films exhibit excellent mechanical properties (tensile strength of 36.7 MPa and elongation at break of 213.9%) and superior bacterial killing and inhibition effects against E. coli. Moreover, the incorporation of green-synthesized AgNPs into the polymeric films also results in a significant improvement in the contact angles formed between the film surface and glycerol droplets, enhanced thermal stability, and a reduction in water swelling and water solubility. All these results highlight the great potential of these biodegradable and antibacterial membranes as an alternative to petroleum-based plastics in food packaging and preservation.
我们在聚乙烯醇(PVA)和壳聚糖基质中加入了绿色合成的银纳米粒子(AgNPs),开发出了一种新型、环保、活性食品包装膜。以芦荟提取物为还原剂,壳聚糖为稳定剂,在高温下原位高产绿色合成了银纳米粒子。通过控制生长液中 AgNO3 前驱体的含量,获得的 AgNPs 呈准球形,尺寸可在 20 ∼ 30 nm 范围内调节。原位合成使 AgNPs 在薄膜中均匀分布,无需提纯。研究了芦荟合成的 AgNPs 的负载量对薄膜特性的影响。结果表明,所获得的负载 AgNPs 的薄膜具有优异的机械性能(拉伸强度为 36.7 兆帕,断裂伸长率为 213.9%),对大肠杆菌具有出色的杀菌和抑菌效果。此外,在聚合物薄膜中加入绿色合成的 AgNPs 还能显著改善薄膜表面与甘油液滴之间形成的接触角,增强热稳定性,降低水膨胀和水溶性。所有这些结果都凸显了这些可生物降解的抗菌膜作为石油基塑料的替代品在食品包装和保存方面的巨大潜力。
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引用次数: 0
Performance of lightweight coconut shell concrete-filled circular steel tube columns under axial compression 轻质椰壳混凝土填充圆钢管柱在轴向压缩下的性能
IF 2.3 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-08-29 DOI: 10.1088/2053-1591/ad6ff7
Ilanthalir Amala Sornam, Jerlin Regin Joseph Dominic
The current study aimed to use coconut shell concrete, a structural lightweight concrete, as an infill material in concrete-filled steel tube (CFST) columns and test it under axial compression. Testing was done on eighteen short, intermediate and long coconut shell CFST columns and six normal-weight CFST short columns for comparison. For both types of columns, the axial load-displacement curves and modes of failure were examined. By varying the length-to-diameter and diameter-to-thickness ratios, the axial capacity of steel tubes filled with coconut shell concrete was assessed. The composite action was verified from the results of the confinement index, strength index and the contribution of the coconut shell concrete as infill concrete. Structural efficiency and energy absorption of the lightweight CFST column was contrasted with its counterpart column. The contribution of coconut shell concrete to the strength of the CFST column was the highest at 61.36% and more significant than that of normal-weight CFST columns. The coconut shell CFST columns were 23.63% lighter than the normal-weight columns, contributing to its higher structural efficiency. These columns also had 8.12% more energy absorption than normal-weight columns. Hence, the results of this investigation revealed that coconut shell concrete has the potential to be utilized in CFST columns. Further, compared to the experimental ultimate loads, the predictions made by the existing codes, EC4 and ANSI/AISC 360 are conservative.
本研究旨在使用椰壳混凝土(一种结构性轻质混凝土)作为混凝土填充钢管(CFST)柱的填充材料,并对其进行轴向压缩测试。对 18 根短、中、长椰壳 CFST 柱和 6 根普通重量 CFST 短柱进行了测试,以进行比较。对这两种柱子的轴向载荷-位移曲线和破坏模式进行了研究。通过改变长径比和径厚比,评估了填充椰壳混凝土的钢管的轴向承载能力。从约束指数、强度指数和椰壳混凝土作为填充混凝土的贡献率的结果中验证了复合作用。轻质 CFST 柱的结构效率和能量吸收与其同类柱子进行了对比。椰壳混凝土对 CFST 柱强度的贡献率最高,达到 61.36%,比普通重量 CFST 柱的贡献率更高。椰壳 CFST 柱比正常重量的柱轻 23.63%,因此结构效率更高。椰壳 CFST 柱的能量吸收率也比正常重量的柱子高 8.12%。因此,这项研究结果表明,椰壳混凝土具有在 CFST 柱中应用的潜力。此外,与实验极限荷载相比,现有规范 EC4 和 ANSI/AISC 360 所做的预测较为保守。
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引用次数: 0
Frost-resistance prediction model for stress-damaged lightweight aggregate concrete based on BPNN: a comparative study 基于 BPNN 的应力破坏轻质骨料混凝土抗冻性预测模型:比较研究
IF 2.3 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-08-29 DOI: 10.1088/2053-1591/ad719b
Chun Fu, Qiushi Zhang
With the depletion of natural resources and the requirement of higher strength-weight ratio, lightweight aggregate concrete has attracted more and more attention because of its good thermal properties, fire resistance and seismic performance. However, exposure to low temperature environments accelerates deterioration of concrete, thereby, reduce the service life of lightweight aggregate concrete. Even worse, in cold and arid regions, lightweight aggregate concrete often experiences accidental impacts, wind erosion, earthquakes, and other disasters during service, these damage significantly impact its frost-resistance. Therefore, accurately and quantitatively describing and predicting the frost-resistance of lightweight aggregate concrete under specific disaster conditions is crucial. In this study, take the initial damage degree and freeze-thaw cycles as input variables, while the relative dynamic elastic modulus (RDEM) as an out variable, a frost resistance prediction models for stress-damaged lightweight aggregate concrete was established based on back propagation neural network (BPNN). The results show that the predicted values of BPNN model are in good agreement with the experimental values, and the results are also compared with the revised Loland model which is proposed by another author. Results demonstrate that the average relative error between predicted values of BPNN and experimental values is only 1.69%, whereas the one of revised Loland model is 9.13%, which indicating that the proposed BPNN prediction model can achieve a relatively accurate quantitative assessment of frost-resistance throughout the entire post-disaster lifecycle of lightweight aggregate concrete, it also broadened the idea and provided a reference for the frost resistance prediction of stress-damaged lightweight aggregate concrete.
随着自然资源的枯竭和对更高强度重量比的要求,轻骨料混凝土因其良好的热性能、耐火性能和抗震性能而受到越来越多的关注。然而,暴露在低温环境中会加速混凝土的老化,从而缩短轻骨料混凝土的使用寿命。更严重的是,在寒冷干旱地区,轻骨料混凝土在使用过程中经常会遭遇意外撞击、风蚀、地震等灾害,这些破坏严重影响了其抗冻性。因此,准确、定量地描述和预测轻骨料混凝土在特定灾害条件下的抗冻性至关重要。本研究以初始破坏程度和冻融循环为输入变量,以相对动态弹性模量(RDEM)为输出变量,建立了基于反向传播神经网络(BPNN)的应力破坏轻骨料混凝土抗冻性预测模型。结果表明,BPNN 模型的预测值与实验值吻合良好,同时还与另一位作者提出的修订版 Loland 模型进行了比较。结果表明,BPNN 预测值与实验值的平均相对误差仅为 1.69%,而修正的 Loland 模型的平均相对误差为 9.13%,这表明所提出的 BPNN 预测模型可以实现对轻质骨料混凝土灾后全生命周期抗冻性的较为准确的定量评估,同时也为应力破坏轻质骨料混凝土的抗冻性预测拓宽了思路,提供了参考。
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引用次数: 0
Measuring depth-dependent residual stresses in gaseous nitrided steels using indentation method 利用压痕法测量气体氮化钢中随深度变化的残余应力
IF 2.3 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-08-29 DOI: 10.1088/2053-1591/ad719c
Ahmet Fatih Yayla, Ridvan Gecu, Nuri Solak, Kursat Kazmanli, Mustafa Urgen
This study investigated residual stress evaluations during gaseous nitriding of 50CrMo4 and 31CrMoV9 steels. The nitriding processes were carried out in the NH3/H2/N2 atmosphere at 525 °C for 2 h by controlling the nitriding potential. The development of depth-dependent residual stresses was conducted using a Vickers indentation instrument with an estimated geometric correction. The obtained results correlated with the sublayer removal-assisted XRD sin2ψ method. Diffusion layers between 135 and 200 μm were obtained for all samples upon nitriding. The surface hardness values reached 475 HV for 50CrMo4 and 825 HV for 31CrMoV9 steels. The geometric correction factor α was calculated as 78° for a Vickers indenter to measure residual stresses. The generated compressive residual stresses by nitriding increased with increasing nitriding potential by 71% (from −350 to −600 MPa) and 13% (from −750 to −850 MPa) for 50CrMo4 and 31CrMoV9 steels, respectively. An approximately linear relationship was obtained between the hardness and residual stress profiles of the nitrided samples.
本研究调查了 50CrMo4 和 31CrMoV9 钢气体氮化过程中的残余应力评估。通过控制氮化电位,氮化过程在 525 °C 的 NH3/H2/N2 大气中进行了 2 小时。使用维氏压痕仪和估算的几何校正对深度相关残余应力进行了分析。获得的结果与次层去除辅助 XRD sin2ψ 方法相关。氮化后,所有样品都获得了 135 至 200 μm 的扩散层。50CrMo4 钢的表面硬度值达到 475 HV,31CrMoV9 钢的表面硬度值达到 825 HV。用维氏压头测量残余应力时,几何校正系数 α 的计算值为 78°。对于 50CrMo4 和 31CrMoV9 钢材,氮化产生的压缩残余应力随着氮化电位的增加分别增加了 71%(从 -350 到 -600 兆帕)和 13%(从 -750 到 -850 兆帕)。氮化样品的硬度和残余应力曲线之间存在近似线性关系。
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引用次数: 0
Numerical simulation study on solidification proceoss of titanium slab ingot by electron beam cold hearth melting 电子束冷炉熔炼钛锭凝固过程的数值模拟研究
IF 2.3 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-08-29 DOI: 10.1088/2053-1591/ad71a3
Wei Cao, Chong Ma, Yang Li, Lei Gao, Guo Chen, Mamdouh Omran
Titanium and titanium alloys are key basic support materials in the field of engineering technology and high technology, and are widely used in the fields of natural gas transportation, chemical corrosion, and marine development. Titanium alloy ingots are often prepared with more solidification defects such as surface cracks and cold shuts, resulting in lower utilization of titanium metal and higher cost of titanium products. The root of this is the lack of in-depth knowledge of the ingot melting and casting process, and the failure to control the thermal conditions of the billet in the molding process within a reasonable range. In this study, based on the Lagrange Euler algorithm, combined with ProCAST finite element software to establish a numerical model, revealing the solid–liquid interface morphology, the length of the transition region, and the change rule of thermal stress under the influence of different process parameters in the solidification process of titanium slab ingot. The results show that with the increase in pulling speed, the depth of the solid–liquid phase line and the width of the mushy zone of slab ingot increase, and the length of the transition region grows. With the increase in casting temperature, the depth of the solid–liquid phase line of the slab ingot decreases, and the mushy zone gradually becomes narrower. The casting temperature and pulling speed are positively correlated with the value of the thermal stress equivalent stress in slab ingots, and the probability of cracks in the corners and ingot surface is higher. This study provides effective theoretical guidance for the realization of stable mass production of high-quality titanium slab ingot.
钛及钛合金是工程技术和高新技术领域的关键基础支撑材料,广泛应用于天然气输送、化工防腐、海洋开发等领域。钛合金铸锭在制备过程中往往存在较多的凝固缺陷,如表面裂纹和冷缩等,导致钛金属利用率较低,钛产品成本较高。究其根源,是对铸锭熔炼和铸造工艺缺乏深入了解,在成型过程中未能将坯料的热条件控制在合理范围内。本研究基于拉格朗日欧拉算法,结合 ProCAST 有限元软件建立数值模型,揭示了钛板坯铸锭凝固过程中不同工艺参数影响下的固液界面形貌、过渡区长度以及热应力变化规律。结果表明,随着拉速的增加,板坯铸锭的固液相线深度和糊化区宽度增加,过渡区长度增长。随着浇铸温度的升高,板坯钢锭的固液相线深度减小,糊化区逐渐变窄。浇铸温度和拉速与板坯钢锭的热应力等效应力值呈正相关,边角和钢锭表面出现裂纹的概率较高。该研究为实现高质量钛板坯铸锭的稳定批量生产提供了有效的理论指导。
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引用次数: 0
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Materials Research Express
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