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Grain Size Measurements Using Circular or Rectangular Test Grids

  • G.F. Vander Voort
Published/Copyright: June 11, 2013
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Practical Metallography
From the journal Practical Metallography Volume 50 Issue 1

Abstract

Experiments were conducted to determine the influence of the number of grains counted using the Jeffries planimetric procedure of ASTM E 112 with a single test circle compared to the number counted using rectangles as suggested by Saltykov. Both planimetric methods produced similar estimates of the ASTM grain size number when the counts per field placement were high. The Saltykov rectangle method is a viable test method and produced good data down to low count numbers. Bias was not observed at low counts, only data scatter. The intercept count method, using only a single test circle per field, yielded slightly higher estimates of the ASTM grain size number, but the difference was relatively insignificant.

Kurzfassung

Es wurden Versuche durchgeführt, um die Anzahl der ausgezählten Körner anhand des planimetrischen Verfahrens nach Jeffries für ASTM E 112 mit einem einzigen Prüfkreis mit der Anzahl wie sie aus dem von Saltykov vorgeschlagenen Verfahren mit Vierecken resultiert, zu vergleichen und zu sehen, wie sich diese Anzahl auf die Korngröße auswirkt. Beide planimetrischen Methoden ergaben ähnliche Schätzwerte für die ASTM-Korngrößenzahl bei hohen Counts pro Platzierung im Feld. Die Methode nach Saltykov mit viereckigem Raster ist ein praktikables Prüfverfahren und erbrachte bis hin zu niedrigen Counts gute Messwerte. Bei niedrigen Counts konnten keine Biasfehler gefunden werden. Lediglich Datenstreuung trat auf. Das Intercept-Zählverfahren mit lediglich einem Prüfkreis pro Feld ergab geringfügig höhere Schätzwerte für die ASTM-Korngrößenzahl, der Unterschied war jedoch relativ unbedeutend.

Übersetzung: E. Engert

George F. Vander Voort Consultant, Struers Inc. and president of Vander Voort Consulting LLC, is a graduate of Drexel University and Lehigh University. A past president of the International Metallographic Society and past chairman of ASTM Committee E-4 on Metallography, George has six patents, over 330 publications and has given 387 lectures in 39 countries. He is a member of the editorial board of Praktische Metallographie. George is a fellow of ASMI, ASTM and the IFHTSE, and is an honorary member of the Polish Society for Stereology.

References/Literatur

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Received: 2012-9-17
Accepted: 2012-9-21
Published Online: 2013-06-11
Published in Print: 2013-01-01

© 2013, Carl Hanser Verlag, München

Articles in the same Issue

  1. Contents/Inhalt
  2. Contents
  3. Editorial
  4. Editorial
  5. Technical Contributions/Fachbeiträge
  6. A Step-By-Step Analysis of the Polishing Process for Tungsten Specimens
  7. Grain Size Measurements Using Circular or Rectangular Test Grids
  8. Fracture of a Compressor Stator Blade in a Gas Turbine Engine
  9. Meeting Diary/Veranstaltungskalender
  10. Meeting Diary
https://doi.org/10.3139/147.110208

Articles in the same Issue

  1. Contents/Inhalt
  2. Contents
  3. Editorial
  4. Editorial
  5. Technical Contributions/Fachbeiträge
  6. A Step-By-Step Analysis of the Polishing Process for Tungsten Specimens
  7. Grain Size Measurements Using Circular or Rectangular Test Grids
  8. Fracture of a Compressor Stator Blade in a Gas Turbine Engine
  9. Meeting Diary/Veranstaltungskalender
  10. Meeting Diary
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