材料工程研究(英文)最新文献_第3页

Monitoring localized corrosion of Inconel 82 weld overlay on 304L SS weld by electrochemical noise 利用电化学噪声监测304L SS焊缝上Inconel 82焊缝镀层的局部腐蚀

材料工程研究(英文) Pub Date : 2019-05-30 DOI: 10.25082/MER.2019.02.003

Girija Suresh, H. Kumar

{"title":"Monitoring localized corrosion of Inconel 82 weld overlay on 304L SS weld by electrochemical noise","authors":"Girija Suresh, H. Kumar","doi":"10.25082/MER.2019.02.003","DOIUrl":"https://doi.org/10.25082/MER.2019.02.003","url":null,"abstract":"The manuscript presents the results from the electrochemical noise (EN) monitoring of Inconel 82 weld overlay on Type 304L stainless steel (SS) weld in 0.01M FeCl3. The microstructure of the weld overlay obtained from optical and scanning electron microscopy (SEM) showed an austenite structure, containing equiaxed dendrites and secondary phases at the interdendritic region. Energy dispersive spectroscopy (EDS) attached to SEM revealed the secondary phases to be Nb rich Laves phase. The electrochemical potential noise was monitored using a three identical electrode configuration. The acquired signals were detrended, and wavelet analysis was employed to encode useful information from the noise transients. Visual examination of the potential noise-time record contained distinct high amplitude transients typical of localized corrosion attack. The energy distribution plots (EDP) of the potential noise derived from wavelet analysis depicted maximum relative energy on D6-D8 crystals, which represent large time scale events such as those occurring from localized attacks. Also, repassivation events too could be divulged from the potential EDP. The micrographs of the post electrochemical noise experimented specimens revealed the occurrence of localized attacks along the interdendritic region and none inside the dendritic cores. The presence of secondary phases along the interdendritic regions was found to be detrimental in chloride medium, imparting inferior localized corrosion resistance to the weld overlay.","PeriodicalId":63081,"journal":{"name":"材料工程研究(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47818849","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

Synthesis and characterisation of Al2O3 nanoparticles as catalyst prepared by polymer co-precipitation method 聚合物共沉淀法制备纳米氧化铝催化剂的合成与表征

材料工程研究(英文) Pub Date : 2019-05-21 DOI: 10.25082/MER.2019.02.002

M. Farahmandjou, N. Golabiyan

引用次数: 10

Investigation of the interaction of material of fuel cladding for WWER-1000 reactor with steam at a temperature of accident overheatings 事故过热温度下WWER-1000反应堆燃料包壳材料与蒸汽相互作用的研究

材料工程研究(英文) Pub Date : 2019-04-22 DOI: 10.25082/MER.2019.02.001

N. Ishchenko, I. Petelguzov, O. Slabospitska

引用次数: 1

A study on the deformation and crushing of copper tubing: experiments, theory & FE modelling 铜管的变形与破碎研究:实验、理论与有限元模拟

材料工程研究(英文) Pub Date : 2019-04-18 DOI: 10.25082/MER.2019.01.005

R. Turner

{"title":"A study on the deformation and crushing of copper tubing: experiments, theory & FE modelling","authors":"R. Turner","doi":"10.25082/MER.2019.01.005","DOIUrl":"https://doi.org/10.25082/MER.2019.01.005","url":null,"abstract":"A series of 250 mm lengths of copper tubing, of 15 mm outer diameter and 0.7 mm wall thickness, were studied to determine their deformation if they were pinched or crushed between rigid objects applying a given force, to replicate potential accidental damage suffered by the copper pipes during service. A finite element modelling framework was developed to simulate the crushing of a copper pipe the same dimensions as that used for experiments, and the experimental data allowed for a validation of the pipe crushing at approximately room temperature, to consider copper pipe carrying cold water. The FE modelling activity was then extended to consider the deformation of copper pipe at 80∘C, carrying heated water at this temperature. The modelling agreed reasonably well with experiment, and applied forces of 1.5 kN began to deform the cold pipe, with the pipe collapsing on itself at loads of 6 kN. The heated pipe began to deform at roughly 1.25 kN. Lastly, theoretical flow calculations were performed to determine the Reynolds value, the flow velocity and the pressure loss and head loss per unit length of the deformed pipes, according to classical pipe flow calculation methods.","PeriodicalId":63081,"journal":{"name":"材料工程研究(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43420972","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: 2

One-step synthesis of TiO2 nanoparticles using simple chemical technique 用简单化学技术一步合成TiO2纳米粒子

材料工程研究(英文) Pub Date : 2019-04-11 DOI: 10.25082/MER.2019.01.004

M. Farahmandjou

引用次数: 6

Behaviour of the electrochemical intrgrator on the basis of solid electrolyte in galvanoharmonic charging mode 基于固体电解质的电化学集成器在电流谐波充电模式下的行为

材料工程研究(英文) Pub Date : 2019-01-28 DOI: 10.25082/MER.2019.01.002

R. M. Guseynov, R. A. Radzhabov, E. A. Medzhidova

引用次数: 0

Frumkin-melik-gaykazan model in the otentiodynamic and galvanodynamic regimes of funcioning 功能的恒动力和流动力机制中的Frumkin-melik-gaykazan模型

材料工程研究(英文) Pub Date : 2019-01-17 DOI: 10.25082/MER.2019.01.001

R. M. Guseynov, R. A. Radzhabov

{"title":"Frumkin-melik-gaykazan model in the otentiodynamic and galvanodynamic regimes of funcioning","authors":"R. M. Guseynov, R. A. Radzhabov","doi":"10.25082/MER.2019.01.001","DOIUrl":"https://doi.org/10.25082/MER.2019.01.001","url":null,"abstract":"Aim The main purpose of this article is to study the behavior of a metallic electrode in the electrolyte which contains a surface-active substance with the property of adsorbtion-desorbtion, in the galvanodynamic and potentiodynamic rejimes. Method The study of the electrochemical behavior of a metallic electrode is carried out by operational impedance method, based on the Ohm’s low on the interaction between the Laplace-transformed expression of current, voltage and complex resistance (impedance) . Results It is obtained the analytical expression of interface voltage –time dependence in a solution which contains a surface-active indifferent substance with the property of adsorbtion-desorbtion; also it is obtained the analytical expression of current density-time dependence which is passing through electrochemical cell in potentiodynamic regime of functioning of the Frumkin-Melik-Gaykazan model. Conclusion It is established that the relation between the interface metallic electrode – indifferent electrolyte with property of adsorbtion-desorbtion voltage in the galvanodynamic rejime has the character of second order parabola; the relation between current density which is passing through a cell and time in potentiodynamic rejime of functioning in the Frumkin – Melik – Gaykazan model has exponential character.","PeriodicalId":63081,"journal":{"name":"材料工程研究(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48585571","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

The Comparative studies of mechanical and interfacial properties between jute and E-Glass fiber-reinforced unsaturated polyester resin based composites 黄麻与e -玻璃纤维增强不饱和聚酯树脂基复合材料力学性能和界面性能的比较研究

材料工程研究(英文) Pub Date : 2019-01-01 DOI: 10.25082/mer.2020.01.001

Kamrun N. Keya, Nasrin A. Kona, M. Razzak, R. Khan

{"title":"The Comparative studies of mechanical and interfacial properties between jute and E-Glass fiber-reinforced unsaturated polyester resin based composites","authors":"Kamrun N. Keya, Nasrin A. Kona, M. Razzak, R. Khan","doi":"10.25082/mer.2020.01.001","DOIUrl":"https://doi.org/10.25082/mer.2020.01.001","url":null,"abstract":"Jute fiber (hessian cloth)-reinforced unsaturated polyester matrix composites (50 wt% fiber) were fabricated by hand lay-up technique. Tensile strength (TS), tensile modulus (TM), bending strength (BS), bending modulus (BM), elongation at break (Eb%), and impact strength (IS) of the composites were found to be 42 MPa, 2.7 GPa, 36 MPa, 2.1 GPa, 3%, and 21 kJ/m2, respectively. On the other hand, TS, TM, BS, BM, and Eb% of E-glass mat reinforced unsaturated polyester resin (UPR) composite were found to be 70 MPa, 3.8 GPa, 80 MPa, 2.5 GPa, and 5%, respectively. Then E-glass/UPR based composites (50 wt% fiber) were fabricated and the mechanical properties were compared with those of the Jute/UPR based composites. It was observed that E-glass fiber-based composites showed almost double mechanical properties as compared to jute composites. The interfacial shear strength of the jute and E-glass fiber-based systems was investigated and found to be 21 kJ/m2 and 21.56 kJ/m2, respectively, measured using the single-fiber fragmentation test. After flexural testing, fracture sides of both types of the composites were studied by scanning electron microscope (SEM) and the results showed that poor fiber-matrix adhesion for Jute/UPR based composites when it compared to that of the E-glass fiber composites. However, it was found that the E-glass fiber based composite has better strength as compared to jute fiber composite.","PeriodicalId":63081,"journal":{"name":"材料工程研究(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69217133","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: 3

Chemical Stability and Thermodynamics of New Zr₂-based Heusler Alloys 新型锆的化学稳定性和热力学₂-基Heusler合金

材料工程研究(英文) Pub Date : 2018-04-27 DOI: 10.25082/MER.2018.01.001

Saleem Yousuf, D. Gupta

引用次数: 2