Materials Science Forum最新文献_第9页

Investigation into Stress Relaxation and Creep Rate of C47200 Copper Alloy C47200 铜合金的应力松弛和蠕变率研究

Materials Science Forum Pub Date : 2024-03-05 DOI: 10.4028/p-yyjr2w

S. Akande, Tuoyo Ikomi, T. Azeez, O. Ikumapayi

{"title":"Investigation into Stress Relaxation and Creep Rate of C47200 Copper Alloy","authors":"S. Akande, Tuoyo Ikomi, T. Azeez, O. Ikumapayi","doi":"10.4028/p-yyjr2w","DOIUrl":"https://doi.org/10.4028/p-yyjr2w","url":null,"abstract":"Copper alloys have high thermal conductivity, relatively high mechanical strength, and toughness over a wide range of temperature; hence they are highly sorted for complex structural applications that required extreme heat flux under load. Creep of materials is classically associated with time-dependent plasticity under a constant stress/load at an elevated temperature, often greater than the absolute melting temperature. This research is aimed to study the evaluation of stress and creep rate in copper, identifying the mechanisms at which copper can easily be exposed to stress and creep deformations in structures. A 12 mm diameter copper rod with the composition of 52.05 % CuO and 30.26 % SnO2 was procured locally. Samples from the procured rod were heat treated to 650°C for 30 minutes and cooled in the still air as well as inside the furnace. Creep test was carried out at 760uC with a constant load corresponding to an initial stress (between 1.5 MPa and 350 MPa) and stress relation was carried out on a 98 kN capacity stress relaxation frame (from 350 MPa to 300 MPa). Rockwell hardness test and metallographic analysis (at 200 mm) were also conducted on the heat treated and unheated control samples. It was established that heat treatment reduced the hardness property of stress relaxed copper, accelerated the stress relaxation process up to 60 %, speed up both primary creep rate and the tertiary creep rate as well altered the linear creep pattern and behaviour.","PeriodicalId":18262,"journal":{"name":"Materials Science Forum","volume":"51 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140264858","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: 0

Investigation of the Behavior of Surface Roughness Suppression Orientation on the Inner Surface of Metal Microtubes Using Crystal Plasticity Finite Element Method 利用晶体塑性有限元法研究金属微管内表面粗糙度抑制方向的行为

Materials Science Forum Pub Date : 2024-03-05 DOI: 10.4028/p-loh9kf

Hayate Sakaguchi, Takuma Kishimoto, Takayuki Hama, K. Tashima, Shinsuke Suzuki

引用次数: 0

Identification of Waste Potential from Maritime Activity - Incorporating Polyethylene Cables into Building Construction 确定海事活动产生废物的可能性 - 将聚乙烯电缆纳入建筑施工中

Materials Science Forum Pub Date : 2024-03-05 DOI: 10.4028/p-h5jgdw

R. Barboza, Harish Daruari, Antonieta Rocha, Miguel A. Carvalho, Paulo Mendonça

{"title":"Identification of Waste Potential from Maritime Activity - Incorporating Polyethylene Cables into Building Construction","authors":"R. Barboza, Harish Daruari, Antonieta Rocha, Miguel A. Carvalho, Paulo Mendonça","doi":"10.4028/p-h5jgdw","DOIUrl":"https://doi.org/10.4028/p-h5jgdw","url":null,"abstract":"Currently, the Azores face a significant problem due to the existence of a large quantity of marine debris derived from fishing activities and gear. This issue represents a threat to the social and environmental aspects of the region. The lack of adequate disposal of this waste produced by the fishing industries is leading to a disruption of the ecosystem. A broad study within the scope of the Azores Ecoblue project in partnership with the Regional Government of the Azores aims to quantify/parameterize and qualify waste from fishing gear. Focused on analyzing the possibility and opportunity of creating a source of revenue for the Region from these raw materials used by the stakeholders identified by a research project called Azores Ecoblue. This survey is being carried out with the aim of identifying adversities related to materials, resulting in the proposal of solutions, involving the recycling and transformation of the polymer, Polyethylene, typically used in mooring cables on fishing vessels. It is essential to raise awareness of the need to reconsider the collection of waste with sustainable potential and relevance in the social and economic context of the region. Polymer identification and characterization was performed in an attempt to address the problem at the source. In addition to identifying the material, this research focuses on characterizing its thermal properties. The development of a construction system composed of reused cables, to be included in a demonstrative prototype, was developed and is presented in this article, emphasizing the importance of implementing sustainable solutions to address the issue of marine litter on the Azorean coast and promote the circular economy.","PeriodicalId":18262,"journal":{"name":"Materials Science Forum","volume":"108 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140079400","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: 0

Durability Studies of Conventional Cement Concrete and Geopolymer Concrete 传统水泥混凝土和土工聚合物混凝土的耐久性研究

Materials Science Forum Pub Date : 2024-03-05 DOI: 10.4028/p-o39dkm

Lakshmi Vara Prasad Meesaraganda, E. Mazumder, L. R. Reddy

{"title":"Durability Studies of Conventional Cement Concrete and Geopolymer Concrete","authors":"Lakshmi Vara Prasad Meesaraganda, E. Mazumder, L. R. Reddy","doi":"10.4028/p-o39dkm","DOIUrl":"https://doi.org/10.4028/p-o39dkm","url":null,"abstract":"The service life of structural members is significantly impacted by the durability of the concrete and that they are made of. The embedded reinforcing steel in durable concrete is protected from corrosion, and the possibility of concrete spalling in the concrete as a result of chemical attack is reduced. This study investigates the effectiveness of geopolymer concretes prepared using fly ash or a mixture of fly ash and slag (SLG). The performance of OPC concrete is likewise evaluated for comparing the durability of geopolymer concretes. This is done in order to compare the two types of concrete. All of the prepared specimens were submerged in theee types of distinct solutions up to 9 months. Four different types of solutions are (i) sodium chloride with 5% concentration, (ii) sodium sulphate 5% concentration, (iii) combination of magnesium sulphate with sodium sulphate with 5% concentration both, and sulphuric acid 3% concentration. The variation in properties were evaluated throughout the duration of the exposure period. According to the findings, it has been demonstrated that Na2SO4 (sodium sulphate) has the most significant effect on the geopolymer concretes, whereas sulphuric acid has the greatest potential to break down OPC concrete. With the effect of sulfuric acid, the strength reduction was 26.57% for OPC concrete and where as for flyash & SLG concretes it is 10.87% & 7.26% respectively. According to the findings, the durability performance of geopolymer concrete is, in general, better to that of cement concrete.","PeriodicalId":18262,"journal":{"name":"Materials Science Forum","volume":"131 36","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140078740","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: 0

Silica Fume-Red Mud Based Geopolymer Stabilized Organic Soil 硅灰红泥土基土工聚合物稳定有机土壤

Materials Science Forum Pub Date : 2024-03-05 DOI: 10.4028/p-vdler9

Rezaul Islam Choudhury, Monowar Hussain

{"title":"Silica Fume-Red Mud Based Geopolymer Stabilized Organic Soil","authors":"Rezaul Islam Choudhury, Monowar Hussain","doi":"10.4028/p-vdler9","DOIUrl":"https://doi.org/10.4028/p-vdler9","url":null,"abstract":"Organic soil presents significant challenges for construction due to its unsuitability as a soil type, often necessitating stabilization using conventional agents like cement. The Silica Fume (SF)-Red Mud (RM) binder mix emerges as a promising alternative stabilizer due to its low carbon footprint coupled with its superior strength-enhancing properties. In this study,we explore the feasibility of employing SF-RM based geopolymer to stabilize organic soil. To activate the collected samples, a solution of sodium hydroxide (NaOH) with molarity (M) of 6, 9, and 12 were utilized, as well as binder (SF + RM) proportions of 10%, 20%, 30%, and 40% relative to dried organic soil and alkali-to-binder (A/B) proportions of 0.5, 0.7, and 0.9, respectively. The experimental results reveal that a variety of factors, including NaOH molarity, A/B proportions, pH, and curing duration, have an effect on the unconfined compressive strength (UCS) of treated organic soil. The best combination was obtained with a binder concentration of 30%, a NaOH molarity of 9M, and an A/B proportion of 0.7. After 28 days of curing, the UCS of the treated organic soil (1714 kPa) was found to be 168 times that of the untreated organic soil (10.2kPa). Further, the production of compounds such as aluminium silicate, sodium aluminosilicate, and potassium aluminosilicate, which have been found by X-ray diffraction (XRD) research, can be ascribed to the increase in strength. Furthermore, when subjected to analysis through Field Emission Scanning Electron Microscopy (FESEM), it becomes evident that these items play a pivotal role in filling the voids within the soil-binder composite. As a consequence, they facilitate the creation of a more smoother, compact and denser structure.","PeriodicalId":18262,"journal":{"name":"Materials Science Forum","volume":"114 19","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140079161","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: 0

Phase Prediction, Microstructure, and Microhardness of Sintered Nickel-Based Superalloy 烧结镍基超级合金的相位预测、微观结构和显微硬度

Materials Science Forum Pub Date : 2024-03-05 DOI: 10.4028/p-es8wsb

B. Babalola, Rudzani Nengwekhulu, O. Ayodele, Boitumelo Charmaine Mashabela, P. Olubambi

引用次数: 0

The Influence of Cow’s Bone Calcium Concentration on the Mechanical Characteristics of a Mg-Al Alloy 牛骨钙浓度对镁铝合金机械特性的影响

Materials Science Forum Pub Date : 2024-03-05 DOI: 10.4028/p-jjia46

T. Azeez, S. Akande, S. Afolalu, A. Adetunla, Bernard Adaramola

引用次数: 0

Enhanced Microhardness and Corrosion Performance of Additively Manufactured Inconel 718 Specimens through Nanostructuring by Severe Plastic Deformation 通过剧烈塑性变形进行纳米结构化，增强快速成型 Inconel 718 试样的显微硬度和腐蚀性能

Materials Science Forum Pub Date : 2024-03-05 DOI: 10.4028/p-zcdb79

S. M. Yusuf, Nur Hidayah Musa, N. Mazlan, Nong Gao

{"title":"Enhanced Microhardness and Corrosion Performance of Additively Manufactured Inconel 718 Specimens through Nanostructuring by Severe Plastic Deformation","authors":"S. M. Yusuf, Nur Hidayah Musa, N. Mazlan, Nong Gao","doi":"10.4028/p-zcdb79","DOIUrl":"https://doi.org/10.4028/p-zcdb79","url":null,"abstract":"Severe plastic deformation (SPD) processes, particularly high-pressure torsion (HPT) have been increasingly applied to metallic specimens fabricated by laser powder bed fusion (L-PBF) additive manufacturing (AM) for enhancing their mechanical and functional properties through nanoscale grain refinement (≤ 100 nm). In this study. L-PBF AM-fabricated Inconel 718 (IN 718) specimens are initially subjected to 10 HPT revolutions to produce nanosized grains. Subsequently, microstructural characterisation, as well as hardness and electrochemical tests are conducted to evaluate the evolution of microstructures, hardness, and corrosion performance of the as-received and HPT-processed specimens by using various microscopy, Vickers microhardness (HV) measurements, and corrosion performance, respectively. The results reveal an average grain size of ~ 46 nm, dense dislocation networks, and nanotwins after 10 HPT processing, which contribute to the two-fold hardness increase compared to the as-received condition. Such microstructures also contributed to the overall improved corrosion performance after 10 HPT processing, as quantified by the 83% and 73% reduction in corrosion rate and pitting potential, respectively.","PeriodicalId":18262,"journal":{"name":"Materials Science Forum","volume":"228 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140265168","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: 0

Effect of Roll Diameter on Temperature of Aluminum Alloy Strip during Casting Using a Vertical Type High Speed Twin Roll Caster 使用立式高速双辊连铸机进行铸造时，轧辊直径对铝合金带温度的影响

Materials Science Forum Pub Date : 2024-03-05 DOI: 10.4028/p-jqcc2k

T. Haga, Toshiaki Okamoto, H. Watari, Shinichi Nishida

引用次数: 0

High Efficiency Milling of Inconel 625 Alloy (Effect of Cutting Condition on Tool Life) 高效铣削铬镍铁合金 625（切削条件对刀具寿命的影响）

Materials Science Forum Pub Date : 2024-03-05 DOI: 10.4028/p-7bxhyc

Kazumasa Kawasaki, Ryuma Hasegawa

引用次数: 0