Procedia Materials Science最新文献_第8页

Formation of Nanostructure in AISI 316L Austenitic Stainless Steel by Friction Stir Processing 搅拌摩擦加工aisi316l奥氏体不锈钢纳米结构的形成

Procedia Materials Science Pub Date : 2015-01-01 DOI: 10.1016/j.mspro.2015.11.008

S.S. Rezaei-Nejad , A. Abdollah-zadeh , M. Hajian , F. Kargar , R. Seraj

{"title":"Formation of Nanostructure in AISI 316L Austenitic Stainless Steel by Friction Stir Processing","authors":"S.S. Rezaei-Nejad , A. Abdollah-zadeh , M. Hajian , F. Kargar , R. Seraj","doi":"10.1016/j.mspro.2015.11.008","DOIUrl":"10.1016/j.mspro.2015.11.008","url":null,"abstract":"<div><p>Friction stir processing (FSP) was used to modify the microstructure in 316L austenitic stainless steel. FSP was successfully applied on 6mm thick plate using a 16mm diameter cylindrical WC-3%Co tool with rotating and traverse speeds of 315rpm and 31.5mm/min, respectively. Grain refinement, microstructural control and the related recrystallization mechanisms were characterized using optical microscopy and FE-SEM. The results indicated that the nanograins with 50-200nm in size have been achieved from base material with grain sizes of 30-40μm. The restoration mechanism responsible for the formation of nanostructure is likely to be discontinuous dynamic recrystallization (DDRX). Decreasing the grain size during FSP led to considerable improvement of surface mechanical properties such as twofold increase in wear resistance and threefold increase in surface hardness. There was a continuous decrease in hardness from the nanograin sized stir zone with 510 HV towards the base material with 180 HV.</p></div>","PeriodicalId":101041,"journal":{"name":"Procedia Materials Science","volume":"11 ","pages":"Pages 397-402"},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.mspro.2015.11.008","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91523801","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 19

Component Replication Using 3D Printing Technology 使用3D打印技术的组件复制

Procedia Materials Science Pub Date : 2015-01-01 DOI: 10.1016/j.mspro.2015.06.049

B. Satyanarayana Dr. , Kode Jaya Prakash

引用次数: 30

Effect of Hot Extrusion on Microstructure and Tensile Properties of Ca Modified Mg-Mg2Si Composite 热挤压对Ca改性Mg-Mg2Si复合材料组织和拉伸性能的影响

Procedia Materials Science Pub Date : 2015-01-01 DOI: 10.1016/j.mspro.2015.11.053

M. Lotfpour, M. Emamy, S.H. Allameh, B. Pourbahari

引用次数: 11

Reduction of Graphene Oxide via Modified Hydrothermal Method 改性水热法还原氧化石墨烯

Procedia Materials Science Pub Date : 2015-01-01 DOI: 10.1016/j.mspro.2015.11.104

M. Ghorbani , H. Abdizadeh , M.R. Golobostanfard

{"title":"Reduction of Graphene Oxide via Modified Hydrothermal Method","authors":"M. Ghorbani , H. Abdizadeh , M.R. Golobostanfard","doi":"10.1016/j.mspro.2015.11.104","DOIUrl":"10.1016/j.mspro.2015.11.104","url":null,"abstract":"<div><p>The chemical reduction of graphene oxide (GO) typically involves highly toxic reducing agents that are harmful to human health and environment. Moreover, complicated surface modification is often needed to avoid aggregation of the reduced GO during reduction process. In this paper, GO was synthesized by modified Hummer's method. Modified hydrothermal method was utilized to prepare reduced GO in pH value of 11 adjusted by NaOH at 140°C for 6h under continuous stirring. FTIR, Raman, SEM and XRD analyses are performed, which reveal that the labile oxygen functional groups are progressively eliminated, thereby partially restoring the π-conjugated network. Raman spectra show G to D band progression. Furthermore, XRD results confirm proper GO reduction. Carbonyl, carboxyl, ether, and phenolic groups are found to be thermally stable, which hinders complete deoxygenation of GO and makes their dispersion in water stable. In modified hydrothermal method, pressure can be controlled efficiently and temperature is lower than simple hydrothermal method. Also, the final product has homogenous structure, thus facilitating the use of graphene-based materials for large-scale applications.</p></div>","PeriodicalId":101041,"journal":{"name":"Procedia Materials Science","volume":"11 ","pages":"Pages 326-330"},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.mspro.2015.11.104","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80749660","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 66

Corrosion Study of MgO-C Bricks in Contact with a Steelmaking Slag 镁碳砖与炼钢渣接触的腐蚀研究

Procedia Materials Science Pub Date : 2015-01-01 DOI: 10.1016/j.mspro.2015.04.068

Edgardo Benavidez , Elena Brandaleze , Leonardo Musante , Pablo Galliano

引用次数: 15

Raman Scattering Applied to Materials Science 拉曼散射在材料科学中的应用

Procedia Materials Science Pub Date : 2015-01-01 DOI: 10.1016/j.mspro.2015.04.014

Andrés Cantarero

引用次数: 37

Effect of pin length on Friction Stir Spot Welding (FSSW) of dissimilar Aluminum-steel joints 针长对异种铝-钢连接搅拌摩擦点焊的影响

Procedia Materials Science Pub Date : 2015-01-01 DOI: 10.1016/j.mspro.2015.05.023

Joaquin M. Piccini , Hernan G. Svoboda

{"title":"Effect of pin length on Friction Stir Spot Welding (FSSW) of dissimilar Aluminum-steel joints","authors":"Joaquin M. Piccini , Hernan G. Svoboda","doi":"10.1016/j.mspro.2015.05.023","DOIUrl":"10.1016/j.mspro.2015.05.023","url":null,"abstract":"<div><p>Friction stir welding (FSW) has produced a great impact in several industries due to the advantages that this process presents. In particular, the automotive industry has developed a variant of the original process, called Friction Stir Spot Welding (FSSW), which has a strong interest related to the welding of aluminum alloys and dissimilar materials in thin sheets. Aluminum-steel welding is an actual challenge, being FSSW an alternative to produce these joints. However, the information available related to the influence of process parameters on the characteristics of aluminum-steel joints is scarce. The aim of this work was to study the effect of the pin length of the welding tool and its penetration depth, during friction stir spot welding (FSSW) of overlaps joints of AA6063 with galvanized low carbon steel. FSSW was done by changing the pins length between 0.65 and 1.5mm, and also by modifying the tool penetration depth in the welded joints. On the welded spots macro and microstructural characterization was performed, Vickers microhardness profiles were determined and Peel and Cross Tension Tests were also done. The maximum loads increased when the tool penetration depth goes up and the pin length decreased. The fracture mode was, at first, interfacial meanwhile it changed to a circumferential mode when the tool penetration depth increased and the pins length was reduced.</p></div>","PeriodicalId":101041,"journal":{"name":"Procedia Materials Science","volume":"9 ","pages":"Pages 504-513"},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.mspro.2015.05.023","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83175814","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 65

Proposed Solution for Random Characteristics of Aluminium Alloy Wire Rods Due to the Natural Aging 铝合金线材自然老化随机特性的解决方案

Procedia Materials Science Pub Date : 2015-01-01 DOI: 10.1016/j.mspro.2015.04.012

Claudio Bunte, Moisés Glassel, Carlos Medina, Diego Zalcman

{"title":"Proposed Solution for Random Characteristics of Aluminium Alloy Wire Rods Due to the Natural Aging","authors":"Claudio Bunte, Moisés Glassel, Carlos Medina, Diego Zalcman","doi":"10.1016/j.mspro.2015.04.012","DOIUrl":"10.1016/j.mspro.2015.04.012","url":null,"abstract":"<div><p>In the last 50 years in the worldwide market for power transmission cables, there has been a tendency to replace aluminium cables electrical grade (EC) with steel cables by fully aluminium alloy (AAAC). The advantage in using cable AAAC is mainly economic (least amount of support structures and maintenance), addition to the elimination of the problems of galvanic corrosion and improved abrasion resistance. In order to obtain better mechanical properties, respect to the pure aluminium, aluminium alloyed with magnesium and silicon (AA6XXX series) is used, which by a combination of cold working and heat treatment allows obtaining greater mechanical strength without affecting too much the electrical conductivity. In this development it has worked with AA6101/6101M alloy. The manufacturing of aluminium alloy wire rods for such applications, using the conventional process Properzi, requires heat treatment of solubilized, continuous or discontinuous (batch). During the waiting time of two months or more, the wire coils are exposed to natural aging at room temperature, entering into the wiredrawing machines with different mechanical properties. The wires obtained by the traditional method of manufacture in Argentina, through the wiredrawing, result in significantly higher mechanical properties, not complying with the standards. Furthermore many breaks occur mainly when a high tensile strength wire is processed for wire 2mm in diameter or less. In the proposed method, a part of the initial wiredrawing is replaced by cold rolling and a subsequent partial aging. The results obtained in this study allow us to conclude that in the proposed process better properties and mechanical integrity are achieved than the traditional process, maintaining the electrical conductivity.</p></div>","PeriodicalId":101041,"journal":{"name":"Procedia Materials Science","volume":"9 ","pages":"Pages 97-104"},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.mspro.2015.04.012","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80874732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

The Future of Civil Engineering with the Influence and Impact of Nanotechnology on Properties of Materials 土木工程的未来与纳米技术对材料性能的影响

Procedia Materials Science Pub Date : 2015-01-01 DOI: 10.1016/j.mspro.2015.06.032

N. Venkat Rao , M. Rajasekhar , K. Vijayalakshmi , M. Vamshykrishna

{"title":"The Future of Civil Engineering with the Influence and Impact of Nanotechnology on Properties of Materials","authors":"N. Venkat Rao , M. Rajasekhar , K. Vijayalakshmi , M. Vamshykrishna","doi":"10.1016/j.mspro.2015.06.032","DOIUrl":"10.1016/j.mspro.2015.06.032","url":null,"abstract":"<div><p>It is true that nanotechnology has become one of the influential technologies in this century since it has been successful in fascinating all most all manifolds of technology, like that it has also embraced the field of Civil Engineering. More particularly the construction sector finds its advantage with nanotechnology, construction industry needs more material and energy resources. Among all the materials used in construction, concrete occupies nearly 70% of the materials by volume and shows significant impact. The advent of nanotechnology helped in producing more strong and durable material than conventional materials. Nanotechnology in making concrete refers to the production and addition of nanosized particles in to concrete at suitable proportions by appropriate methods. The basic purpose of using nanosized materials in concrete is to improve compressive and flexural strengths at early age, it is possible due to the high surface – to volume ratio. It also helps to improve the pore structure of concrete. Nanosized materials help to reduce porosity as they absorb less water compared to traditional cementitious materials. The presence of nanomaterials reduces the amount of cement content in concrete than the conventional concrete. This can be achieved without sacrificing strength characteristics, thereby it is possible to produce eco friendly concrete called green concrete. This paper tries to review how nanotechnology is used in civil engineering and its effects on various nanomaterials viz. steel, glass, wood and the paper also throws a special focus on concrete how does it affect various properties of materials.</p></div>","PeriodicalId":101041,"journal":{"name":"Procedia Materials Science","volume":"10 ","pages":"Pages 111-115"},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.mspro.2015.06.032","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88565551","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 37

Size, Morphology and Optical Properties of Titanium-based Colloidal Nanoparticles Prepared by Dc Electrical Arc Discharge in Different Liquids 不同液体直流电弧放电制备的钛基胶体纳米颗粒的尺寸、形貌和光学性质

Procedia Materials Science Pub Date : 2015-01-01 DOI: 10.1016/J.MSPRO.2015.11.018

N. Haghighi, R. Poursalehi

引用次数: 5