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Investigation of the Boriding Process of the Ti-Al Intermetallic Alloy ge48-2-2 Tak.ng into Account the Probability of the Influence of the Substrate Modification

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Materials Sciences and Applications 2018年第11期9卷 873-882页

作者： Dimitrios I. Zagk.iveris ge.rgios k. triantafyllidis Department of Chemical Engineering Aristotle University of Thessaloniki Thessaloniki Greece

Boriding of the Ti-Al intermetallic ge48-2-2 at 1273 k.for 10 hours was performed. In order to ensure that no any serious alteration occurred in the substrate, it was previously examined with X-Ray Diffractometry (XRD), after it has undergone an annealing process at the temperature of boronizing. Subsequently, we examined the coating with XRD and Scanning Electron Microscopy, in order to characterize its structure and morphology. A dense TiΒ2 layer, 10 - 15 μm thick. was formed, but also Cr2B3 and NbN, BN and some Ti-Al phases were detected. Efforts were undertak.n to focus on influence of the substrate modification, towards the quality of the coating.

关键词： Titanium Aluminide Boriding Titanium Boride Substrate Modification Phase Analysis X-Ray Diffraction

Natural Aging Effects on the Solutionizing Heat Treatment Process of the A6060 Al Alloy As-Cast Billets for Profile Production

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Materials Sciences and Applications 2015年第2期6卷 111-116页

作者： ge.rgios k. triantafyllidis Natalyia V. Puk.alsk. Dimitrios I. Zagk.iveris Department of Chemical Engineering Aristotle University Thessaloniki Greece

Recently results were presented for an R & D program for handling the as-cast billets of an Al-Si-Mg A6060 Al alloy at the solutionizing heat treatment temperature. A reduction in the solutionizing temperature of the as-cast billets from 585℃ to 540℃ was found. This leads to substantial energy savings without lowering the quality of the final commercial Al profiles. The alloy was treated from the microstructural point of view as an Aluminum Metal-Matrix Composite (Al-MMC). Strengthening of the Al matrix grains during the process was quantified and measured by micro-Vick.rs hardness testing. A possible application of this is to apply the suggested lower temperature solutionizing process to billets stock.iled in the factory for some months. The alloy undergoes natural aging, a physical process at ambient temperature that alters its microstructural features. Does this aging affect the quality of the lower temperature solutionizing treated profiles? The effect of the natural aging by micro-Vick.rs hardness testing on some of the same samples of our original work.stock.iled in our lab for 10 months was investigated. We applied, further, the Image-Pro Plus image processing software on them in an effort to collect microstructural data and compared them to values tak.n 10 months earlier. Also we tried an interconnection between the two experimental processes treating the alloy as an Al-MMC.

关键词： A6060 Al Alloy Solutionizing Natural Aging Image Processing

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垃圾土室内动力试验研究

岩土力学 1999年第4期20卷 1-5页

作者：周健池毓蔚 Th.triantafyllidis D.k.nig 同济大学地下建筑与工程系上海200092 波鸿大学

利用循环三轴试验对城市垃圾土的动力特性进行了研究。试验中对试样分别施加两种不同荷载，一种为循环压缩，另一种为循环压缩和伸长荷载，分别模拟交通荷载和地震荷载情况，循环荷载频率为1Hz。对城市垃圾土的动模量和振动残余应变试... 详细信息

利用循环三轴试验对城市垃圾土的动力特性进行了研究。试验中对试样分别施加两种不同荷载，一种为循环压缩，另一种为循环压缩和伸长荷载，分别模拟交通荷载和地震荷载情况，循环荷载频率为1Hz。对城市垃圾土的动模量和振动残余应变试验结果进行了分析，并给出了计算公式。

关键词：城市垃圾土循环三轴试验动模量室内动力试验

Re: Prevalence of erectile dysfunction in the European Union

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Asian Journal of Andrology 2003年第3期5卷 255-255页

作者： A.G.Papatsoris,A.triantafyllidis,A.gek.s Department of Urology "Agios Andreas" Regional Hospital 26335 Patras Greece Department of Urology "Agios Andreas" Regional Hospital 26335 Patras Greece Department of Urology "Agios Andreas" Regional Hospital 26335 Patras Greece

Dear Sir,Erectile dysfunction (ED) is a worldwide problem whose prevalence is projected to rise sharply due to increasing age in Europe and North America and to population growth in other continents, especially Asia [... 详细信息

关键词： in ED et In Re Prevalence of erectile dysfunction in the European Union of

Characterization of the A6060 Al Alloy Mainly by Using the Micro-Hardness Vick.rs Test in Order to Optimize the Industrial Solutionizing Conditions of the As-Cast Billets

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Materials Sciences and Applications 2015年第1期6卷 86-94页

作者： G. k. triantafyllidis I. k.ligaridis D. I. Zagk.iveris I. Orfanou S. Spyridopoulou E. Mitoudi-Vagourdi S. Semertzidou Department of Chemical Engineering Aristotle University Thessaloniki Greece

Heat treatable Al alloys of the 6xxx series are produced by the industry following a path that consolidates melting of raw materials, casting the melt in billets, solutionizing the billets following a suitable thermal cycle, pre-heating and extruding the material to profiles and finally aging the profiles. Although this procedure is k.own for pure materials from the scientific point of view, the introduction of scrap to the raw materials for melting modifies to an extent the fabrication conditions that follow casting. This fact affects the production cost. In this article we propose a research way based mainly on micro-Vick.rs tests that lead to an optimization of the treatment conditions for solutionizing the billets.

关键词： A6060 Al Alloy Strengthening Solutionizing Aging Micro-Vick.rs

Residual Stresses and Micro-Hardness Testing in Evaluating the Heat Affected Zone’s Width of Ferritic Ductile Iron Arc Welds

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Materials Sciences and Applications 2016年第1期7卷 73-82页

作者： ge.rgios k. triantafyllidis Dimitrios I. Zagliveris Dionysios L. k.lioulis Christos S. Tsiompanis Titos N. Pasparak.s Athanasios P. Gredis Melina L. Sfantou Ioannis E. Giouvanak.s Department of Chemical Engineering Aristotle University Thessaloniki Greece

Shielded Metal Arc Welding (SMAW) in Ductile Irons (DI) is often required by foundries for practical manufacturing reasons. The mechanical properties of the welded structures are strongly dependent on their HAZ’s width. A model based on the behaviour of the ferritic matrix of high-Si DIs in order to mak. an approach in measuring their HAZ’s width is developed in this study. A series of thermal treatments on 3.35 and 3.75 wt% Si as-cast DIs and spot SMAWs is applied on these materials. The applied SMAWs are done on non-preheated and preheated samples (150℃ - 300℃). For welding we modify the amperage (100 - 140A). The micro-hardness Vick.rs changes in the ferrite of the as-cast samples and inside the HAZ of the welded ones can be attributed to the existence of residual stresses (RS) in the ferritic matrix and assist in estimating the HAZ’s width.

关键词： Welds Heat Affected Zone Residual Stresses Micro-Hardness Vick.rs Heat Affected Zone’s Width