Practical Metallography最新文献_第10页

Interview with guest editor Prof. Roland Haubner 专访特约编辑Roland Haubner教授

Practical Metallography Pub Date : 2022-11-27 DOI: 10.1515/pm-2022-0073

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Microstructure of an extraordinary Bronze Age copper ingot with a high antimony content 青铜时代铜锭的显微结构，锑含量高

Practical Metallography Pub Date : 2022-11-27 DOI: 10.1515/pm-2022-1004

R. Haubner, S. Strobl

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Slags from Bronze Age copper production in Acqua Fredda 阿夸弗雷达青铜时代铜生产的炉渣

Practical Metallography Pub Date : 2022-11-27 DOI: 10.1515/pm-2022-1003

R. Haubner, S. Strobl

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Coupled microscopic and micromagnetic depth-specific analysis of plastic deformation and phase transformation of metastable austenitic steel AISI 304L by flow forming 流变成形亚稳奥氏体钢AISI 304L塑性变形与相变的微观与微磁耦合深度特异性分析

Practical Metallography Pub Date : 2022-10-23 DOI: 10.1515/pm-2022-0064

J. Rozo Vasquez, H. Kanagarajah, B. Arian, L. Kersting, W. Homberg, A. Trächtler, F. Walther

{"title":"Coupled microscopic and micromagnetic depth-specific analysis of plastic deformation and phase transformation of metastable austenitic steel AISI 304L by flow forming","authors":"J. Rozo Vasquez, H. Kanagarajah, B. Arian, L. Kersting, W. Homberg, A. Trächtler, F. Walther","doi":"10.1515/pm-2022-0064","DOIUrl":"https://doi.org/10.1515/pm-2022-0064","url":null,"abstract":"Abstract This paper presents the characterization of the microstructure evolution during flow forming of austenitic stainless steel AISI 304L. Due to plastic deformation of metastable austenitic steel, phase transformation from γ-austenite into α’-martensite occurs. This is initiated by the formation of shear bands as product of the external stresses. By means of coupled microscopic and micromagnetic investigations, a characterization of the microstructure was carried out. In particular, this study shows the distribution of the strain-induced α’-martensite and its influence on material properties like hardness at different depths. The microstructural analyses by means of electron backscattered diffraction (EBSD) technique, evidence a higher amount of α’-martensite (ca. 23 %) close to the outer specimen surface, where the plastic deformation and the direct contact with the forming tool take place. In the middle area (ca. 1.5 mm depth from the outer surface), the portion of transformed α’-martensite drops to 7 % and in the inner surface to 2 %. These results are well correlated with microhardness and micromagnetic measurements at different depths. EBSD and atomic force microscopy (AFM) were used to make a detailed characterization of the topography and degree of deformation of the shear bands. Likewise, the mechanisms of nucleation of α’-martensite were discussed. This research contributes to the development of micromagnetic sensors to monitor the evolution of properties during flow forming. This makes them more suitable for closed-loop property control, which offers possibilities for an application-oriented and more efficient production.","PeriodicalId":20360,"journal":{"name":"Practical Metallography","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86131783","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

Segmented chip formation during machining under the influence of different atmospheres 加工过程中不同气氛影响下的切屑形成

Practical Metallography Pub Date : 2022-10-23 DOI: 10.1515/pm-2022-0065

F. Schaper, B. Lengacker

引用次数: 0

Lumen & Colours: A journey into the world of science 流明与色彩:科学世界之旅

Practical Metallography Pub Date : 2022-10-23 DOI: 10.1515/pm-2022-0066

K. Reiter, S. Wiljes, F. Engel, I. Ebinal

{"title":"Lumen & Colours: A journey into the world of science","authors":"K. Reiter, S. Wiljes, F. Engel, I. Ebinal","doi":"10.1515/pm-2022-0066","DOIUrl":"https://doi.org/10.1515/pm-2022-0066","url":null,"abstract":"Abstract A metallographer is often rewarded with a beautiful image when looking through the microscope. These images deserve to be made accessible to the general public. Within the project “Lumen & Colours: Faces of a city – a participatory project combining media art and urban design” funded by the German Federal Cultural Foundation (German: Kulturstiftung des Bundes), the opportunity arose to map images recorded via light optical as well as scanning electron microscopy onto different building facades of the city. A selection of images from research and failure analysis conducted at the Institute for Silicon Technology (ISIT), for example, were projected onto the facade of the cleanroom. The appeal lies in the fact that an image is associated with a location, that matter is merged with imagination and natural sciences with art. On the cleanroom building, which is a work of art in itself as its structural design is modelled after a silicon wafer, the image and the facade merge to become one. Art and science are surprisingly close to each other. A new dimension is revealed on the huge 36-meter wide facade of the Fraunhofer ISIT by a giant video projector with a weight of around 100 kg and an output of 30 000 ANSI lumens. [1] Moreover, the images were animated and projected onto different buildings in the city as part of a virtual presentation. This contribution will explain the technical background of the images obtained in battery research and from the analysis of silicon wafers and solder joints and will show the different views offered by microscopic observation and how these images become one with different facades.","PeriodicalId":20360,"journal":{"name":"Practical Metallography","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75986886","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}

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Cause analysis of the fluorescent displays on the guide vane platform 导叶平台荧光显示原因分析

Practical Metallography Pub Date : 2022-10-23 DOI: 10.1515/pm-2021-1018

H. Zhang, C. Lv, S. Qu, C. Dong, X. Wang, Z. Zhang

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Picture of the Month 本月图片

Practical Metallography Pub Date : 2022-09-24 DOI: 10.1515/pm-2021-0101

N. Rashid, J. Sharma

{"title":"Picture of the Month","authors":"N. Rashid, J. Sharma","doi":"10.1515/pm-2021-0101","DOIUrl":"https://doi.org/10.1515/pm-2021-0101","url":null,"abstract":"A N ECHOCARDIOGRAPHIC examination performed on the fetus of a 23-year-old primigravida woman at 36 weeks’ gestation revealed multiple densities in the right and left ventricles (Figure 1). An earlier fetal echocardiographic examination, performed at 205⁄7 weeks’ gestation, had normal findings. The mother had received prenatal care throughout her pregnancy, which was without complications or known risk factors. Antenatal screening studies were all normal. The mother’s medical history was unremarkable. She took multivitamins and ferrous sulfate regularly and denied ingestion or abuse of alcohol or illicit drugs. Family history was positive for a seizure disorder in a sibling of the mother. There was no family history of fetal death, cardiac or renal diseases, or mental retardation. On physical examination, multiple erythematous papules were noted over the mother’s nose and cheeks (Figure 2). The infant was born at term by spontaneous vaginal delivery. An echocardiographic examination confirmed a structurally normal heart with multiple cardiac tumors within both ventricles (Figure 3). Findings from Holter monitoring were unremarkable without the appearance of arrhythmias. Head and renal ultrasonographic examination results were normal, without evidence of tumors. A complete eye examination by an ophthalmologist and an examination of the infant’s skin revealed no abnormalities.","PeriodicalId":20360,"journal":{"name":"Practical Metallography","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88972258","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

Target preparation of low-pressure cold-sprayed metal powder coatings to create defined micro-leakage 目标制备低压冷喷涂金属粉末涂层，以产生定义的微泄漏

Practical Metallography Pub Date : 2022-09-24 DOI: 10.1515/pm-2022-0057

M. Kappertz, C. Hoven, F. Pauly, R. Lohoff, G. Natour

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Materialographic Preparation of Salt 盐的物质制备

Practical Metallography Pub Date : 2022-09-24 DOI: 10.1515/pm-2022-0058

R. Blank, H. Nitschke, R. Saliwan Neumann, A. Kranzmann

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