Ciência & Tecnologia dos Materiais最新文献_第3页

The effect of post-weld heat treatment on microstructure and tensile properties of alloy C-276 welded joints fabricated by pulsed current gas tungsten arc welding 焊后热处理对脉冲电流钨极气体保护焊接C-276合金接头组织和拉伸性能的影响

Ciência & Tecnologia dos Materiais Pub Date : 2017-05-01 DOI: 10.1016/J.CTMAT.2017.03.001

M. Arivarasu, M. Manikandan, A. Jebaraj, N. Arivazhagan

引用次数: 4

The effect of post-weld heat treatment on microstructure and tensile properties of alloy C-276 welded joints fabricated by pulsed current gas tungsten arc welding 焊后热处理对脉冲电流钨极气体保护焊接C-276合金接头组织和拉伸性能的影响

Ciência & Tecnologia dos Materiais Pub Date : 2017-05-01 DOI: 10.1016/j.ctmat.2017.03.001

M. Arivarasu , M. Manikandan , A. Vinoth Jebaraj , N. Arivazhagan

{"title":"The effect of post-weld heat treatment on microstructure and tensile properties of alloy C-276 welded joints fabricated by pulsed current gas tungsten arc welding","authors":"M. Arivarasu , M. Manikandan , A. Vinoth Jebaraj , N. Arivazhagan","doi":"10.1016/j.ctmat.2017.03.001","DOIUrl":"https://doi.org/10.1016/j.ctmat.2017.03.001","url":null,"abstract":"<div><p>The Mo-rich TCP phases P and μ are susceptible to hot cracking in the alloy C-276. These phases can be reduced by quashing the microsegregation of alloying element Mo in the weldment. The present study investigates the possibility of reducing the microsegregation by post weld heat treatment of the weldments. The joints were fabricated by pulsed current gas tungsten arc welding by employing different filler wires ERNiCrMo-3 and ERNiCrMo-4. The weld joints were characterized with respect to microstructure, Scanning Electron Microscope (SEM), Energy Dispersive Spectroscopy (EDS), and tensile test. The optical microstructure revealed the fine equiaxed dendrites were observed in the fusion zone. EDS analysis revealed the presence of Mo-rich segregation in the subgrain boundary in the ERNiCrMo-3 and absence in the later. The results show that selection of temperature to dissolve Mo segregation is not sufficient in the case of ERNiCrMo-3. The tensile result shows the improved strength in both weldments compared to base metal.</p></div>","PeriodicalId":10198,"journal":{"name":"Ciência & Tecnologia dos Materiais","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.ctmat.2017.03.001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91710815","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: 4

Investigations on the structure – property relationships of PCGTA welds involving Inconel 718 and AISI 430 含Inconel 718和AISI 430的PCGTA焊缝组织性能关系的研究

Ciência & Tecnologia dos Materiais Pub Date : 2017-05-01 DOI: 10.1016/J.CTMAT.2016.05.005

K. D. Ramkumar, T. Mohan, Rachit Pandey, V. Saxena, S. Aravind, Shubham Singh

引用次数: 10

Investigations on the structure – property relationships of PCGTA welds involving Inconel 718 and AISI 430 含Inconel 718和AISI 430的PCGTA焊缝组织性能关系的研究

Ciência & Tecnologia dos Materiais Pub Date : 2017-05-01 DOI: 10.1016/j.ctmat.2016.05.005

K. Devendranath Ramkumar, T. Harsha Mohan, Rachit Pandey, Vimal Saxena, S. Aravind, Shubham Singh

{"title":"Investigations on the structure – property relationships of PCGTA welds involving Inconel 718 and AISI 430","authors":"K. Devendranath Ramkumar, T. Harsha Mohan, Rachit Pandey, Vimal Saxena, S. Aravind, Shubham Singh","doi":"10.1016/j.ctmat.2016.05.005","DOIUrl":"https://doi.org/10.1016/j.ctmat.2016.05.005","url":null,"abstract":"<div><p>The present investigation deals with the weldability, structure – property relationship of dissimilar metallurgical joints involving Nickel based superalloy Inconel 718 and ferritic stainless steel AISI 430 using pulsed current gas tungsten welding (PCGTAW) process employing ER2553 and ERNiCrMo-4 filler wires. NDT analysis and macrostructure examination corroborated for defect free weldments. Microstructure studies revealed the presence of unmixed zone at the weld interface of Inconel 718 whereas grain coarsening effect was observed at the heat effected zone (HAZ) of AISI 430. Both cellular and equiaxed dendrites were dominated at the fusion zone of ERNiCrMo-4 weldment; whereas different types of ferrite morphologies such as delta and widmanstätten ferrite were observed at the cap and middle zones of ER2553 fusion zone respectively. It was opined that the tensile failures occurred at the parent metal of AISI 430 for both the fillers. Charpy V-notch studies showed that ERNiCrMo-4 weldment exhibited better impact toughness than ER2553 weldment. Similarly the bend test also recommended the use of ERNiCrMo-4 filler due to the acquaintance of excellent bending strength and soundness. This study also addressed the structure – property relationships of these weldments. The outcomes of the study would be highly beneficial to the nuclear, aerospace and petrochemical industries.</p></div>","PeriodicalId":10198,"journal":{"name":"Ciência & Tecnologia dos Materiais","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.ctmat.2016.05.005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91623853","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: 10

On the influence of porosity and pore size on AlSi17 alloy foam using artificial neural network 用人工神经网络研究孔隙率和孔径对AlSi17合金泡沫的影响

Ciência & Tecnologia dos Materiais Pub Date : 2017-05-01 DOI: 10.1016/j.ctmat.2017.05.004

Dipen Kumar Rajak , L.A. Kumaraswamidhas , S. Das

{"title":"On the influence of porosity and pore size on AlSi17 alloy foam using artificial neural network","authors":"Dipen Kumar Rajak , L.A. Kumaraswamidhas , S. Das","doi":"10.1016/j.ctmat.2017.05.004","DOIUrl":"10.1016/j.ctmat.2017.05.004","url":null,"abstract":"<div><p>In the present investigation, AlSi17 Aluminum alloy closed-cell foam is fabricated through Melt route process using Calcium powder as thickening agent and Titanium hydride as foaming agent along with the addition of 10wt% Silicon Carbide particles. The effect of pore and pore size on the deformation mechanism under static loading conditions is studied. Also, the fabricated foam properties are analyzed after the completion of the test. The strain rate loading conditions of the compression test conducted on the Al foam lies in the range of 10<sup>-3</sup>s<sup>-1</sup> to 10s<sup>-1</sup> and the above investigations are carried out according to the loading conditions. The Artificial Neural Artwork (ANN) approach is employed for predicting the compressive deformation of the fabricated Al alloy foam using simulations. The Plateau stress data is obtained from the compression tests and the neural network functions are successively modeled and later the specific energy absorption (SEA) is calculated from the plateau stress. The simulation results of the ANN are in good agreement with the compression test results and the predictions are performed with highest accuracy.</p></div>","PeriodicalId":10198,"journal":{"name":"Ciência & Tecnologia dos Materiais","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.ctmat.2017.05.004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82699980","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: 6

Estudo da influência das concentrações do precursor BTSE e do flexibilizante polietilenoglicol na composição do sol e nas propriedades do filme híbrido 研究了BTSE前驱体和聚乙二醇柔软剂浓度对溶胶组成和杂化膜性能的影响

Ciência & Tecnologia dos Materiais Pub Date : 2017-05-01 DOI: 10.1016/J.CTMAT.2016.05.006

Sandra Raquel Kunst, Estela Knopp Kerstner, Lilian Vanessa Rossa Beltrami, Rosiana Boniatti, Henrique Ribeiro Cardoso, Tiago Lemos Menezes, Jane Zoppas Ferreira, C. Malfatti

引用次数: 0

Spectral analysis of the chemical structure of carboxymethylated cellulose produced by green synthesis from coir fibre 椰胶纤维绿色合成羧甲基化纤维素化学结构的光谱分析

Ciência & Tecnologia dos Materiais Pub Date : 2017-05-01 DOI: 10.1016/j.ctmat.2016.05.007

E.U. Ikhuoria , S.O. Omorogbe , O.G. Agbonlahor , N.O. Iyare , S. Pillai , A.I. Aigbodion

引用次数: 9

A comparative study of manufacturing processes of complex surface parts in Titanium Ti6Al4V Ti6Al4V钛合金复杂表面零件制造工艺的比较研究

Ciência & Tecnologia dos Materiais Pub Date : 2017-05-01 DOI: 10.1016/j.ctmat.2017.03.002

S.D. Castellanos , Jorge Lino Alves , Rui J. Neto

{"title":"A comparative study of manufacturing processes of complex surface parts in Titanium Ti6Al4V","authors":"S.D. Castellanos , Jorge Lino Alves , Rui J. Neto","doi":"10.1016/j.ctmat.2017.03.002","DOIUrl":"https://doi.org/10.1016/j.ctmat.2017.03.002","url":null,"abstract":"<div><p>Titanium and its alloys have been increasingly used since the 1950s, because of its excellent characteristics, such as the specific resistance, corrosion resistance, and biocompatibility, among others. The most employed alloys are the alpha-beta Ti6Al4V (representing 50% of the market), normally used in devices that demand optimized designs and complex technological properties. The manufacture of components in titanium requires dedicated equipment and the combination of different technologies, like electrical discharge machining, five-axis machining, investment casting, additive manufacturing and others. This work presents a literature review of casting, machining and additive manufacturing technologies relative to titanium parts manufacturing, indicating the most common problems and the solutions proposed, with special empahsis to Ti6Al4V, due to its wide industrial use. The goal is presenting a comparative experimental study of the surface finishing, geometric accuracy and microhardness, in a Ti6Al4V impeller manufactured by Investment Casting, Machining and Selective Laser Melting.</p></div>","PeriodicalId":10198,"journal":{"name":"Ciência & Tecnologia dos Materiais","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.ctmat.2017.03.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91710816","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: 5

Patent search on cork (2010-2015) 软木专利检索(2010-2015)

Ciência & Tecnologia dos Materiais Pub Date : 2017-05-01 DOI: 10.1016/j.ctmat.2016.03.007

Luís Gil

引用次数: 0

Ultimate use of Cork – Unorthodox and innovative applications 软木的终极用途-非正统和创新的应用

Ciência & Tecnologia dos Materiais Pub Date : 2017-05-01 DOI: 10.1016/J.CTMAT.2016.03.005

M. Mateus, J. Bordado, R. Santos

引用次数: 10