Implications of EBSD-based Grain Size Measurement on Structure-Property Correlations

Milo V. Kral; Daniel J. F. Drabble; Benjamin R. Gardiner; Peter C. Tait

doi:10.3139/147.110054

Article

Implications of EBSD-based Grain Size Measurement on Structure-Property Correlations

Milo V. Kral , Daniel J. F. Drabble , Benjamin R. Gardiner and Peter C. Tait

Published/Copyright: May 5, 2013

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From the journal Practical Metallography Volume 46 Issue 9

Abstract

Samples of annealed and cold rolled 70%Cu-30%Zn brass and 800H alloy were characterized using electron backscatter diffraction (EBSD) pattern analysis to determine average grain diameter, with the ability to differentiate between random high angle grain boundaries and annealing twin boundaries. Hardness measurements of both materials and minimum creep rates for the brass alloy were measured and compared to average grain diameter measurements, which had been calculated with twin boundaries both included and excluded (in accord with ASTM E 112). The present results indicate that annealing twin boundaries contribute to mechanical properties and therefore should be considered in structure-property correlations.

Kurzfassung

Es wurden Proben von geglühtem und kalt gewalztem Messing aus 70%Cu und 30%Zn und aus der Legierung 800H mit Hilfe einer Analyse des Musters der Elektronenrückstreubeugung (EBSD) zur Bestimmung des durchschnittlichen Korndurchmessers mit der Fähigkeit, zwischen zufälligen Großwinkelkorngrenzen zu differenzieren, und durch Glühen von Zwillingsgrenzen charakterisiert. Es wurden Härtemessungen an beiden Werkstoffen sowie der Mindestkriechgeschwindigkeiten für Legierung Messing gemessen und mit Messungen des durchschnittlichen Korndurchmessers verglichen, der sowohl unter Einbeziehung als auch unter Ausschluss von Zwillingsgrenzen (gemäß ASTM E 112) errechnet worden waren. Die vorliegenden Ergebnisse zeigen an, dass sich durch das Glühen von Zwillingsgrenzen die mechanischen Eigenschaften verändern und deshalb in den Wechselbeziehungen zwischen Struktur und Eigenschaften berücksichtigt werden sollten.

Milo Kral Ph.D. Materials Science & Engineering (1996) from Vanderbilt University. 1996—98 ASEE post-doc fellowship at the Physical Metallurgy Branch of the US Naval Research Laboratory in Washington DC. Since 1998 working at University of Canterbury, Christchurch New Zealand, now Associate Professor and Head of Mechanical Engineering.

Peter Tait BE (hons) in Mechanical Engineering from the University of Canterbury, Christchurch, New Zealand. 25 years experience in the design, operation and maintenance of steam reformers. Currently Senior Reliability Engineer with Methanex Corp.; responsible for upwards of 6000 installed reformer tubes and associated outlet systems.

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Received: 2009-1-15

Accepted: 2009-1-28

Published Online: 2013-05-05

Published in Print: 2009-09-01

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https://doi.org/10.3139/147.110054