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Practical Metallography最新文献

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Gift for the gods or scrapping over scrap metal? Metallographic examination of sword fragments from the Late Bronze Age hoard from Slavonski Brod, Croatia 是给上帝的礼物，还是在废金属上做文章?克罗地亚斯拉旺斯基布罗德青铜时代晚期窖藏中剑片的金相检验
Practical Metallography Pub Date : 2023-03-25 DOI: 10.1515/pm-2023-0019
M. L. Perez Gonzalez, R. Schwab
{"title":"Gift for the gods or scrapping over scrap metal? Metallographic examination of sword fragments from the Late Bronze Age hoard from Slavonski Brod, Croatia","authors":"M. L. Perez Gonzalez, R. Schwab","doi":"10.1515/pm-2023-0019","DOIUrl":"https://doi.org/10.1515/pm-2023-0019","url":null,"abstract":"Abstract The deposition of metal in hoards appear throughout the European Bronze Age and there is on-going dispute about motivations behind the practice of hoarding metals at that period. Therefore, nine fragments of bronze swords from a late Bronze Age hoard have been investigated by metallography and X-ray fluorescence analysis (EDXRF) in order to evaluate their conditions. The objects do not show compositional deviations from contemporaneous material, but they are of poor quality showing considerable casting defects and pronounced dendritic segregation. They may never have been finished. Nonetheless, the reasons for their destruction and burial do not become evident.","PeriodicalId":20360,"journal":{"name":"Practical Metallography","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87679256","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
Blechwerkstoffe auf dem virtuellen Prüfstand 锡原料被虚拟的浮光化
Practical Metallography Pub Date : 2023-03-25 DOI: 10.1515/pm-2023-0022
{"title":"Blechwerkstoffe auf dem virtuellen Prüfstand","authors":"","doi":"10.1515/pm-2023-0022","DOIUrl":"https://doi.org/10.1515/pm-2023-0022","url":null,"abstract":"","PeriodicalId":20360,"journal":{"name":"Practical Metallography","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79511467","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
Meeting Diary 会议的日记
Practical Metallography Pub Date : 2023-03-21 DOI: 10.1515/pm-2023-0023
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引用次数: 0
Image processing methods and light optical microscopy for in-situ quantification of chromatic change and anode dilation in Li-ion battery graphite anodes during (de-)lithiation 图像处理方法和光学显微镜用于原位定量锂离子电池(去)锂化过程中石墨阳极的色度变化和阳极膨胀
Practical Metallography Pub Date : 2023-02-28 DOI: 10.1515/pm-2022-1022
A. Jansche, S. Desapogu, C. Hogrefe, A. Choudhary, F. Trier, A. Kopp, C. Weisenberger, T. Waldmann, M. Wohlfahrt‐Mehrens, T. Bernthaler, G. Schneider
{"title":"Image processing methods and light optical microscopy for in-situ quantification of chromatic change and anode dilation in Li-ion battery graphite anodes during (de-)lithiation","authors":"A. Jansche, S. Desapogu, C. Hogrefe, A. Choudhary, F. Trier, A. Kopp, C. Weisenberger, T. Waldmann, M. Wohlfahrt‐Mehrens, T. Bernthaler, G. Schneider","doi":"10.1515/pm-2022-1022","DOIUrl":"https://doi.org/10.1515/pm-2022-1022","url":null,"abstract":"Abstract In Lithium-ion batteries, the graphite anode is known to undergo a noticeable chromatic change during lithiation and de-lithiation by forming graphite intercalation compounds. Additionally, the graphite anode primarily contributes to the volume change of the battery. Using a novel in-situ optical microscopy setup for imaging cross-sections of Li-ion full cells, both effects can be studied simultaneously during charging and discharging. In this work, we describe feature extraction methods to quantify these effects in the image data (3730 images in total) captured during the lithiation and de-lithiation process. Automated and manual evaluations are compared. The images show graphite anodes and NMC 622 cathodes. For colorfulness, we evaluate different methods based on classical image processing. The metrics calculated with these approaches are compared to the results of ColorNet, which is a trainable colorfulness estimator based on deep convolutional neural networks. We propose a supervised semantic segmentation approach using U-Net for the layer thickness measurement and the anode dilation derived from it.","PeriodicalId":20360,"journal":{"name":"Practical Metallography","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82004504","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
Picture of the Month 本月图片
Practical Metallography Pub Date : 2023-02-28 DOI: 10.1515/pm-2023-0015
{"title":"Picture of the Month","authors":"","doi":"10.1515/pm-2023-0015","DOIUrl":"https://doi.org/10.1515/pm-2023-0015","url":null,"abstract":"","PeriodicalId":20360,"journal":{"name":"Practical Metallography","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135678105","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
Meeting Diary 会议的日记
Practical Metallography Pub Date : 2023-02-28 DOI: 10.1515/pm-2023-0017
{"title":"Meeting Diary","authors":"","doi":"10.1515/pm-2023-0017","DOIUrl":"https://doi.org/10.1515/pm-2023-0017","url":null,"abstract":"","PeriodicalId":20360,"journal":{"name":"Practical Metallography","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135678104","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
Researchers develop optical method to verify topological phases in magnetic materials 研究人员开发了光学方法来验证磁性材料的拓扑相
Practical Metallography Pub Date : 2023-02-28 DOI: 10.1515/pm-2023-0016
{"title":"Researchers develop optical method to verify topological phases in magnetic materials","authors":"","doi":"10.1515/pm-2023-0016","DOIUrl":"https://doi.org/10.1515/pm-2023-0016","url":null,"abstract":"","PeriodicalId":20360,"journal":{"name":"Practical Metallography","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83774115","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
Hot Tearing in an Investment Cast Burner Swirler 熔模铸造燃烧器旋流器的热撕裂
Practical Metallography Pub Date : 2023-02-28 DOI: 10.1515/pm-2023-0014
A. Neidel, B. Fischer, S. Riesenbeck
{"title":"Hot Tearing in an Investment Cast Burner Swirler","authors":"A. Neidel, B. Fischer, S. Riesenbeck","doi":"10.1515/pm-2023-0014","DOIUrl":"https://doi.org/10.1515/pm-2023-0014","url":null,"abstract":"Abstract The damage case dealt with in the present work relates to a generally less common manufacturing defect that was discovered during its installation. The part was sourced from a supplier. An installation of the defective part in a large gas turbine engine used for energy generation could thus be prevented. The defect, a solidification crack, could have been repaired by welding and the component could have been used for operation. Instead, it was subjected to destructive examinations aiming at identifying what caused the crack. As the component could not possibly perform its function prior to being repaired by welding we are, in any event, talking about a damage case. The solidification crack initiated at a site of oxide infiltration. It was thus clearly a casting defect. The respective supplier was advised to reduce the content of non-metallic inclusions by the use of ceramic filters when the material is poured into the shell mold and a better control of the vacuum in the casting furnace.","PeriodicalId":20360,"journal":{"name":"Practical Metallography","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72704354","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
A comprehensive study on the metallographic preparation of W-Re samples for high resolution electron-based microscopy 高分辨电子显微W-Re样品金相制备的综合研究
Practical Metallography Pub Date : 2023-02-28 DOI: 10.1515/pm-2022-1037
M. Sommerauer, M. Siller, H. Clemens, V. Maier-Kiener
{"title":"A comprehensive study on the metallographic preparation of W-Re samples for high resolution electron-based microscopy","authors":"M. Sommerauer, M. Siller, H. Clemens, V. Maier-Kiener","doi":"10.1515/pm-2022-1037","DOIUrl":"https://doi.org/10.1515/pm-2022-1037","url":null,"abstract":"Abstract Modern day rotating X-ray anodes utilize a conversion layer comprised of a tungstenrhenium alloy. The thermomechanical loading of this layer during computed tomography operation introduces various signs of fatigue like cracking, roughening, melting, or microstructural changes. Previous work on preparing tungsten samples primarily considered intact thin films or bulk material. This work focuses on the metallographic preparation of the conversion layer surface, which represents the sample edge in polished cross-sectional cuts. The main goals were minimizing preparation artefacts and maximizing obtainable image quality during electron backscatter diffraction. Twelve preparation methods were compared with regard to edge rounding, chipping, and obtainable image quality. Coating the samples with a thin layer of molybdenum and adding a tungsten sheet for edge stabilization led to vastly improved results. Chemical-mechanical polishing of such a sample gave the most balanced set of considered benchmarks.","PeriodicalId":20360,"journal":{"name":"Practical Metallography","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87115176","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
Picture of the Month 本月图片
Practical Metallography Pub Date : 2023-01-30 DOI: 10.1515/pm-2023-0010
{"title":"Picture of the Month","authors":"","doi":"10.1515/pm-2023-0010","DOIUrl":"https://doi.org/10.1515/pm-2023-0010","url":null,"abstract":"","PeriodicalId":20360,"journal":{"name":"Practical Metallography","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135554960","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
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