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Influence of the Sample Preparation Technique on the μ Phase Fraction Analysis in a Fe-25Co-15Mo Alloy by Means of XRD

Presented at the Metallography Conference 2014 in Leoben, Austria
  • C. Turk , G. Kellezi , H. Leitner , H. Clemens and S. Primig
Published/Copyright: June 3, 2015
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Practical Metallography
From the journal Practical Metallography Volume 52 Issue 6

Abstract

The powder metallurgically processed carbon-free alloy Fe-25Co-15Mo (in m.-%) can be hardened via the precipitation of an intermetallic μ phase (Fe, Co)7Mo6 by solution annealing, quenching and subsequent aging. Solution annealing is carried out in the austenite region which leads to a supersaturation of the matrix with molybdenum and the precipitation of nm sized μ phase particles during subsequent aging. “Primary” μ phase particles that are 1–2 μm in diameter formed during prior hot isostatic pressing are the source of molybdenum for aging. However, during solution annealing, these “primary” μ phase particles also impede grain growth. Therefore, the solution annealing process should be optimized to avoid extensive grain growth while still obtaining sufficient molybdenum contents in the matrix. In order to characterize the solution annealing process as a function of time and temperature, dilatometer experiments were performed to monitor the dissolution kinetics of the μ phase. The remaining μ phase fraction was determined in a complementary way by applying two characterization methods: Quantitative analysis of scanning electron microscope images and X-ray diffraction.

Kurzfassung

Die pulvermetallurgisch hergestellte kohlenstofffreie Legierung Fe-25Co-15Mo (in m.-%) kann durch Lösungsglühen, Abschrecken und darauffolgendes Auslagern über die intermetallische μ Phase (Fe, Co)7Mo6 ausgehärtet werden. Dazu erfolgt das Lösungsglühen im Austenitgebiet, um die Matrix für die Ausscheidungsbildung mit Molybdän zu übersättigen. Die während des heiß-isostatischen Pressens gebildeten 1–2 μm großen ‚primären“ μ Phasenpartikel dienen als Molybdänlieferant, jedoch wirken die „primären“ μ Phasen beim Lösungsglühen auch kornwachstumshemmend. Aus diesem Grund muss der Lösungsglühprozess dementsprechend optimiert werden, so dass ein ausgewogenes Eigenschaftsverhältnis zwischen Grobkornbeständigkeit und gelöstem Molybdänanteil vorhanden ist. Um die Lösungsglühung hinsichtlich Zeit und Temperatur zu charakterisieren, wurden Dilatometerversuche durchgeführt, damit das μ Phasenauflösungsverhalten analysiert werden konnte. Der verbleibende μ Phasenanteil wurde komplementär mit zwei Analysemethoden bestimmt. Neben rasterelektronenmikroskopischen Aufnahmen und deren Bildanalyse wurden Messungen mittels Röntgendiffraktometrie durchgeführt.

Translation: E. Engert

References / Literatur

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Published Online: 2015-06-03
Published in Print: 2015-06-15

© 2015, Carl Hanser Verlag, München

Articles in the same Issue

  1. Contents/Inhalt
  2. Contents
  3. Editorial
  4. Editorial
  5. Technical Contributions/Fachbeiträge
  6. Impact of Phase Distribution on the Fracture Toughness of High Temperature Resistant Mo-Si-B Alloys
  7. The Applicability of Nanoindentation for the Examination of Microstructured Areas in CP Titanium Samples
  8. Influence of the Sample Preparation Technique on the μ Phase Fraction Analysis in a Fe-25Co-15Mo Alloy by Means of XRD
  9. Uncharacteristic Circumferential TMF Cracking in a Heavy-duty Stationary Gas Turbine Engine Burner Outlet
  10. Meeting Diary/Veranstaltungskalender
  11. Meeting Diary
https://doi.org/10.3139/147.110344

Articles in the same Issue

  1. Contents/Inhalt
  2. Contents
  3. Editorial
  4. Editorial
  5. Technical Contributions/Fachbeiträge
  6. Impact of Phase Distribution on the Fracture Toughness of High Temperature Resistant Mo-Si-B Alloys
  7. The Applicability of Nanoindentation for the Examination of Microstructured Areas in CP Titanium Samples
  8. Influence of the Sample Preparation Technique on the μ Phase Fraction Analysis in a Fe-25Co-15Mo Alloy by Means of XRD
  9. Uncharacteristic Circumferential TMF Cracking in a Heavy-duty Stationary Gas Turbine Engine Burner Outlet
  10. Meeting Diary/Veranstaltungskalender
  11. Meeting Diary
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