Characterization of Frictional Stressed White Etching Layers out of Cutting Tools by Means of Transmission Electron Microscopy (TEM)
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F. Walzhofer
Abstract
White etching layers have been found at the surface of water submerged cutting tools and have been analyzed by transmission electron microscopy (TEM). For high resolution investigations, samples had been prepared by sandwich and lift-out preparation. The investigations have shown a grain refinement at the surface. The origin martensitic microstructure is transferred into a nano-crystalline microstructure of domain sizes down to 50 nm. The crystallographic structure was identified by electron diffraction as martensite. Moreover, the depth of the grain-refined layer is not as deep as the white etching phenomenon as it is found in conventional optical micrographs. Thus, the white etching layer is not only caused by the grain refinement.
Kurzfassung
In unter Wasser arbeitenden Schneidwerkzeugen wurden weiß ätzende Schichten gefunden und mittels Transmissionselektronenmikroskopie untersucht. Zur Durchführung der hochauflösenden Untersuchungen, wurden Proben mittels Sandwich- und Lift-Out-Präparation hergestellt. Bei diesen zeigte sich eine Kornfeinung an der Oberfläche: Die ursprünglich martensitische Mikrostruktur wurde in eine Struktur mit etwa 50 nm großen nanokristallinen Domänen umgewandelt. Mittels Elektronenbeugung wurde die kristallographische Struktur als Martensit bestimmt. Der Bereich der Kornfeinung reicht jedoch nicht gleich weit in das Material, wie der weiß-ätzende Effekt in herkömmlichen optischen Gefügebildern. Der weiß-ätzende Effekt ist daher nicht nur durch die Kornfeinung zu begründen.
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© 2014, Carl Hanser Verlag, München
Artikel in diesem Heft
- Contents/Inhalt
- Contents
- Editorial
- Editorial
- Technical Contributions/Fachbeiträge
- Characterization of Frictional Stressed White Etching Layers out of Cutting Tools by Means of Transmission Electron Microscopy (TEM)
- Grain Size Measurement in Experimental Co-Re-based Alloys to Study Grain Coarsening, Part I
- Colour Metallography of Cast Aluminium Alloys
- Failure Analysis of EN24 Steel Shear Bolt Used in Space Programme
- Meeting Diary/Veranstaltungskalender
- Meeting Diary
Artikel in diesem Heft
- Contents/Inhalt
- Contents
- Editorial
- Editorial
- Technical Contributions/Fachbeiträge
- Characterization of Frictional Stressed White Etching Layers out of Cutting Tools by Means of Transmission Electron Microscopy (TEM)
- Grain Size Measurement in Experimental Co-Re-based Alloys to Study Grain Coarsening, Part I
- Colour Metallography of Cast Aluminium Alloys
- Failure Analysis of EN24 Steel Shear Bolt Used in Space Programme
- Meeting Diary/Veranstaltungskalender
- Meeting Diary
