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Method for Emissivity Estimation of Metals 金属发射率估算方法
Acta Materialia Transilvanica Pub Date : 2018-04-01 DOI: 10.2478/amt-2018-0010
E. Filep, Dénes Nimród Kutasi, L. Kenéz
{"title":"Method for Emissivity Estimation of Metals","authors":"E. Filep, Dénes Nimród Kutasi, L. Kenéz","doi":"10.2478/amt-2018-0010","DOIUrl":"https://doi.org/10.2478/amt-2018-0010","url":null,"abstract":"Abstract Knowledge of the surface emissivity of metals is becoming more and more important both from the material science, process modelling and control point of view. Previous research results have shown that the emissivity of most metals depends on the temperature of the surface. It has also been reported that the most important temperature region is between 300 – 1000 K degrees, where the change of the emissivity is the most intense, which is also the most significant from a process control point of view [1]. We also report temperature dependent emissivity observed during plasma nitriding of low alloy steels [2]. Related to one of our present research topics the study of the low alloy aluminum (AlMg1, AlMg3) emissivity has prooven relevant. In this article the developed emissivity estimation model is presented. In the first part a literature overview and the theoretical approach of the new method is discussed, followed by the experimental results for low alloy aluminium emissivity determination and a comparison with the results available in the literature.","PeriodicalId":426392,"journal":{"name":"Acta Materialia Transilvanica","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134327192","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
Analysis of the Effect of Ultrasonic Welding on Microstructure 超声焊接对组织影响的分析
Acta Materialia Transilvanica Pub Date : 2018-04-01 DOI: 10.2478/amt-2018-0016
T. Kovács, P. Pinke
{"title":"Analysis of the Effect of Ultrasonic Welding on Microstructure","authors":"T. Kovács, P. Pinke","doi":"10.2478/amt-2018-0016","DOIUrl":"https://doi.org/10.2478/amt-2018-0016","url":null,"abstract":"Abstract Ultrasonic welding is very useful for joining thin metal sheets [1, 2]. The effect of ultrasound on microstructure is currently not well understood because the changes produced depend very much on the welding parameters and the properties of the metal being considered. Thin sheets formed by cold rolling acquire a special grain structure. During the welding process the heat produced causes recrystallization; even where heat is not applied in the joining process the recrystallization process alters the mechanical properties within the heat affected zone (HAZ). The mechanical properties of the welded samples depend on the microstructure. In this work we analyse the ultrasonic welding effect on the joint and the HAZ [3, 4].","PeriodicalId":426392,"journal":{"name":"Acta Materialia Transilvanica","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121247364","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
Materials Science and Engineering – Some Aspects in Central and Eastern European (CEE) Countries 材料科学与工程-中欧和东欧(CEE)国家的一些方面
Acta Materialia Transilvanica Pub Date : 2018-04-01 DOI: 10.2478/amt-2018-0002
J. Gyulai
{"title":"Materials Science and Engineering – Some Aspects in Central and Eastern European (CEE) Countries","authors":"J. Gyulai","doi":"10.2478/amt-2018-0002","DOIUrl":"https://doi.org/10.2478/amt-2018-0002","url":null,"abstract":"Abstract This introductory paper summarizes the characteristics of how “Science” and “Engineering” differ from each other, forming the interdisciplinary topic of Materials Science and Engineering (MS&E). It will be shown how microelectronics has developed from modern materials science, causing a change in paradigm, and how microelectronics has become the “mother” science of informatics, changing life on Earth. To prove the importance of materials, a table is shown summarizing how modern MS&E forms the basis of practically all industries. The situation and development state of MS&E in CEE countries - despite different levels of industrialization – have some characteristics in common, and the way to development might also have techniques in common. We will also mention the knowledge base that CEE countries possessed during the period of political change, and the likely future that an elderly scientist foresees for the region with the help of young ambitious scientists.","PeriodicalId":426392,"journal":{"name":"Acta Materialia Transilvanica","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121260621","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
Heat Treatment Effect on Lath Martensite 热处理对板条马氏体的影响
Acta Materialia Transilvanica Pub Date : 2018-04-01 DOI: 10.2478/amt-2018-0008
E. R. Fábián, Áron Kótai
{"title":"Heat Treatment Effect on Lath Martensite","authors":"E. R. Fábián, Áron Kótai","doi":"10.2478/amt-2018-0008","DOIUrl":"https://doi.org/10.2478/amt-2018-0008","url":null,"abstract":"Abstract During our investigation lath martensite was produced in low carbon steels by austenitization at 1200 °C/20 min, and the cooling of samples in ice water. The samples were tempered at a range of temperatures. The tempering effects on microstructure and on mechanical proprieties were investigated. Some samples with lath martensite microstructure were cold rolled and heat treated at different temperatures. Recrystallization was observed after heat treatment at 600-700 °C.","PeriodicalId":426392,"journal":{"name":"Acta Materialia Transilvanica","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132713642","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: 1
Surface Roughness Effect in the Case of Welded Stainless Steel Corrosion Resistance 焊接不锈钢耐腐蚀情况下的表面粗糙度效应
Acta Materialia Transilvanica Pub Date : 2018-04-01 DOI: 10.2478/amt-2018-0018
L. Toth, F. Haraszti, T. Kovács
{"title":"Surface Roughness Effect in the Case of Welded Stainless Steel Corrosion Resistance","authors":"L. Toth, F. Haraszti, T. Kovács","doi":"10.2478/amt-2018-0018","DOIUrl":"https://doi.org/10.2478/amt-2018-0018","url":null,"abstract":"Abstract It is known that fusion welding can cause a decrease in the corrosion resistance of the heat affected zone of unstabilized stainless steels. The reason for this problem is that the welding heat (in the heat affected zone (HAZ)) can cause chromium-carbide (Cr23C6) precipitation with the simultaneous reduction of chromium content at the local grain boundaries. The chromium content dictates the corrosion resistance level. The relationship between surface roughness and corrosion behaviour is well known. We sought to find the difference between the corrosion resistance and surface roughness relationship in the case of cold rolled stainless steel and in the case of heat treated (welding heat effect simulated) stainless steel [1-3].","PeriodicalId":426392,"journal":{"name":"Acta Materialia Transilvanica","volume":"61 12","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114003667","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: 9
A New Method for Determining the Pullability of Composite Reinforcing Ceramic Fibres 一种测定复合增强陶瓷纤维可拉性的新方法
Acta Materialia Transilvanica Pub Date : 2018-04-01 DOI: 10.2478/amt-2018-0006
J. Dobránszky, E. Bitay
{"title":"A New Method for Determining the Pullability of Composite Reinforcing Ceramic Fibres","authors":"J. Dobránszky, E. Bitay","doi":"10.2478/amt-2018-0006","DOIUrl":"https://doi.org/10.2478/amt-2018-0006","url":null,"abstract":"Abstract A unique method for producing aluminium matrix composite wires is the Blücher’s process, i.e. continuous gas-pressure infiltration. An essential condition of the process is that the fibre roving of the reinforcing fibres can be pulled across the orifices of the gas-pressure system with the least damage. The article describes a new test procedure that is capable of characterizing this essential functional property of the ceramic reinforcing fibres in a manner comparable and quantitative.","PeriodicalId":426392,"journal":{"name":"Acta Materialia Transilvanica","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122065233","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 Expansion Pressure on the Drug Eluting Coating and the Corrosion Characteristics of Coronary Stents 膨胀压力对冠脉支架药物洗脱涂层及腐蚀特性的影响
Acta Materialia Transilvanica Pub Date : 2018-04-01 DOI: 10.2478/amt-2018-0012
Krisztina Horicsányi, L. Asztalos, D. Károly, É. Fazakas
{"title":"Effect of Expansion Pressure on the Drug Eluting Coating and the Corrosion Characteristics of Coronary Stents","authors":"Krisztina Horicsányi, L. Asztalos, D. Károly, É. Fazakas","doi":"10.2478/amt-2018-0012","DOIUrl":"https://doi.org/10.2478/amt-2018-0012","url":null,"abstract":"Abstract During implantation, stents are delivered in crimped state to the narrowed lesion, where they are expanded to the desired size by the balloon. Due to insufficient size selection or high resistance to plaque, the stent is often widened by the expansion pressure to a level greater than the nominal pressure specified by the manufacturer. Depending on the degree of overpressure, the nominal diameter of the stent may change by several tenths of a millimetre. Numerous studies have dealt with the physiological effects of overexposure and stenogenic stress, but so far no studies have been carried out to investigate the stent coating and corrosion properties of the stent. In our research a widely used drug-eluting, platinum-chromium alloyed steel stent was observed with an inflation pressure of 12 and 18 bar. Scanning electron microscopy revealed lesions of the coating and potentiodynamic tests were performed to determine the corrosion rate.","PeriodicalId":426392,"journal":{"name":"Acta Materialia Transilvanica","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117153180","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
Chemical Durability of Uranium Oxide Containing Glasses 含氧化铀玻璃的化学耐久性
Acta Materialia Transilvanica Pub Date : 2018-04-01 DOI: 10.2478/amt-2018-0004
E. Bitay, I. Kacso, E. Veress
{"title":"Chemical Durability of Uranium Oxide Containing Glasses","authors":"E. Bitay, I. Kacso, E. Veress","doi":"10.2478/amt-2018-0004","DOIUrl":"https://doi.org/10.2478/amt-2018-0004","url":null,"abstract":"Abstract ZrO2 doped Na-Ba-borosilicate glasses suitable as matrix materials for HLW immobilization were synthesized and corrosion behaviour was investigated in different aqueous media. Hydrolytic stability is increased with the doping level until 5 mol %; above this value the glass vitrification tendency is strongly intensified. Unexpectedly, ZrO2 doping diminished the corrosion stability in 1M HCl solution, and low ZrO2 content showed a low corrosion resistance in 1M Na2CO3 solution also. Doping effect was negligible in case of synthetic seawater. The glass structure is significantly stabilized by the integration of the 30% UO3 added.","PeriodicalId":426392,"journal":{"name":"Acta Materialia Transilvanica","volume":"241 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121100655","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: 1
Construction of Albumin-Coated 3D Allograft Based on Cone-beam CT Images 基于锥束CT图像构建白蛋白包被三维同种异体移植物
Acta Materialia Transilvanica Pub Date : 2018-04-01 DOI: 10.2478/amt-2018-0014
J. Kónya, K. Kulcsár
{"title":"Construction of Albumin-Coated 3D Allograft Based on Cone-beam CT Images","authors":"J. Kónya, K. Kulcsár","doi":"10.2478/amt-2018-0014","DOIUrl":"https://doi.org/10.2478/amt-2018-0014","url":null,"abstract":"Abstract The 3D block products presented in this study are used in dental surgery to provide bone replacement for patients who do not possess a sufficient amount of bone tissue for implantation. If dental implants are supported by a proper amount of allografts, the mastication ability of the patient can be totally restored. The required bone replacement for the insertion of dental implants is a reconstruction utilising lyophilized human bone tissue treated with alveolar and mandibular odontological albumin. This study puts emphasis on the analysis, planning and processing of CBCT images, and on the machining and production three-dimensional albumin-coated allograft. The study also extends to former and current bone grafting techniques, and provides a review on BoneAlbumin and the selection of suitable materials. This paper also investigates the domestic and international bone grafting market. Furthermore, it contains a case study and conclusions.","PeriodicalId":426392,"journal":{"name":"Acta Materialia Transilvanica","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131060012","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
Metal Foam Analysis Based on CT Layers 基于CT层的金属泡沫分析
Acta Materialia Transilvanica Pub Date : 2018-04-01 DOI: 10.2478/amt-2018-0020
T. Varga, T. Mankovits
{"title":"Metal Foam Analysis Based on CT Layers","authors":"T. Varga, T. Mankovits","doi":"10.2478/amt-2018-0020","DOIUrl":"https://doi.org/10.2478/amt-2018-0020","url":null,"abstract":"Abstract The geometrical modelling of metal foams remains one of the greatest challenges facing researchers in the field. In this paper the analysis of the inner structure of closed-cell aluminium foam - an essential part of the construction of an idealized foam model - is presented. With the application of special purpose software the properties of the foam cells can be mapped precisely and the results applied to the development of idealized foam geometry constructed in CAD applications.","PeriodicalId":426392,"journal":{"name":"Acta Materialia Transilvanica","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130312236","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
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