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Volume 54 Issue 11
Issue of
Practical Metallography
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Contents
Journal Overview
Contents
Contents/Inhalt
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Contents
Page range: 741-741
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Editorial
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Editorial
Page range: 743-743
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Technical Contributions/Fachbeiträge
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October 30, 2017
Experimental and Numerical Investigation of the Recrystallization on a Sheet of Wrought Aluminum Alloy Al 6061
Y. Mohajer-Irvani, R. Scheck, D. Willer, E. A. Soppa
Page range: 745-766
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Abstract
Apart from temperature and time, the deformation introduced in the material is another important parameter that affects the recryristallization process in metallic materials. The present study aims at examining the impact of the introduced deformation on recystallization and grain growth in Al 6061 alloy sheet. The deformation was introduced by hardness indentations in accordance with the Brinell test method applying two different loads. The samples with the hardness indentations were cut in half along the line on which the indentations were performed. One half served as sample providing a reference condition, while the other half was recrystallized. The grain size and the degree of misorientation (Kernel Average Misorientation, KAM) of the two neighboring measurement points were evaluated in both halves of the samples. Using the FE method, the hardness measurement procedure could be numerically simulated and the deformations which occurred beneath the hardness indentations could be evaluated and associated with experimental findings related to the grain size and the misorientation.
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Metallographic Characterization of Heterogeneous Structures in Sliding Materials Made of Bronze and Special Brass
U. Hofmann, V. Skrabal
Page range: 767-793
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Microstructures of copper materials for slide bearings are often complex and may exhibit a carrier crystal structure characterized by a coexistence of hard and soft structural constituents. Relief polishing is an interesting option for the sample preparation of such materials, as it allows for statements regarding the resistance of the microstructure to abrasive wear. Differential interference contrast microscopy as well as confocal microscopy are particularly suited in order to study the relief polished sections. In addition to that, simple metallographic procedures may be applied to assess the mechanical properties of the structural constituents. Different examination methods combined give an idea of how carrier crystal structures behave in slide bearing applications.
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Fracture of an Industrial Steam Turbine Horizontal Joint Nut Upon Tightening
B. Fischer, M. Giller, A. Neidel, S. Riesenbeck
Page range: 794-801
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The nut of a horizontal joint fastener cracked upon tightening during assembly in an industrial steam turbine factory. It was previously used in an over-pressure test, but was otherwise not yet used in service. Nut and bolt were made of the nickel-based superalloy Nimonic 80A, a precipitation-hardenable wrought high-strength alloy with excellent creep and corrosion properties. Such alloys usually get a complex heat treatment after hot-rolling, comprising homogenizing and multiple ageing cycles. The subject nut failed due to an extreme case of mixed grain size which detrimentally affected mechanical properties and was attributed to an insufficient degree of deformation during hot rolling.
Meeting Diary/Veranstaltungskalender
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Page range: 809-811
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Journal Overview
About this journal
Practical Metallography is a bilingual (German-English) journal that informs you thoroughly on materialographic preparation, imaging and analysis of microstructures. The journal covers the development and improvement of metallographic methods and equipment, possibilities of optical and electron microscopy, spectroscopy, diffraction techniques, non-destructive testing, metallographic investigations of materials, problems of specimens preparation and evaluation including useful laboratory advice and recipes, failure analysis including damage detection and elimination.
All articles are subject to thorough, independent peer review.
Practical Metallography works closely with Deutsche Gesellschaft für Materialkunde e.V. (DGM)
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