Unbiased Evaluation of Chord Length Distributions from Orientation Maps

Pantleon, Wolfgang

doi:10.4028/www.scientific.net/MSF.495-497.219

Paper Titles

Orientation Maps Derived from TEM Diffraction Patterns Collected with an External CCD Camera
p.197

The Effect of Grain Orientation on Micro Frictional of Medium Carbon Steel
p.203

Scalar Measures of Texture Heterogeneity
p.207

Optical Grain Size Measurements: What is Being Measured? Comparative Study of Optical and EBSD Grain Sizes Determination in 2D Al Foil
p.213

Unbiased Evaluation of Chord Length Distributions from Orientation Maps
p.219

Extension of Orientation Mapping to the Transmission Electron Microscope
p.225

Effect of Orientation Noise on the Determination of Percolation Thresholds from Electron Back-Scatter Pattern Data
p.231

Three-Dimensional Texture Analysis
p.237

High Resolution Texture Analysis with Spherical Wavelets
p.245

HomeMaterials Science ForumTextures of Materials - ICOTOM 14Unbiased Evaluation of Chord Length Distributions...

Unbiased Evaluation of Chord Length Distributions from Orientation Maps

Abstract:

Grain structures in crystalline material are commonly identied by orientation inhomogeneities in orientation maps. A statistical approach is introduced to extract quantitative information on the chord length distribution of grains from orientation data gathered by electron back-scattering diffraction.

Info:

Periodical:

Materials Science Forum (Volumes 495-497)

Main Theme:

Textures of Materials - ICOTOM 14

Edited by:

Paul Van Houtte and Leo Kestens

Pages:

219-224

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.495-497.219

Citation:

W. Pantleon, "Unbiased Evaluation of Chord Length Distributions from Orientation Maps ", Materials Science Forum, Vols. 495-497, pp. 219-224, 2005

Online since:

September 2005

Authors:

Wolfgang Pantleon

Keywords:

Stereology, Chord Length, Chord Length Distribution, Electron Backscatter Diffraction (EBSD), Orientation Map

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$38.00

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References

[1] Randle, V., Microtexture Determination and Its Application, The Institute of Materials, London (1992).

[2] Adams, B.L., Wright, S.I., and Kunze, K., Metal. Trans. A 24 (1993) 819.

[3] Morawiec, A., Orientations and rotations, Springer-Verlag, Berlin (2004).

[4] Pantleon, W., Mat. Res. Soc. Symp. Proc. 819 (2004) N. 1. 5. 1.

[5] Pantleon, W., Mater. Sci. Eng. A 319 (2001) 211.

[6] Trötzschel, J., Pantleon, W., Haberjahn, M., and Klimanek, P., Mater. Sci. Eng. A 234 (1997) 842. This article was processed using the LATEX macro package with TTP style.

Paper TitlePages

Exploration on Shape of Profiles Determined by Chord Angle Control Method

Authors: Ling Ling, Yuan Sheng Zeng

Abstract: Through compassion of relative merits of the existing two control methods of straighten anti-curve line and chord line measure for cold-formed profiles, a three-pivot chord angle control method of non-endpoint measurement was proposed in this paper, and its feasibility was proved by using mathematical deduction. Using mapping method, the forming of profiles can be controlled by the only one set of orderly array chord angles and chord lines obtained by a spline curve of profiles, and meanwhile, the length of automation feedstock in forming process of profiles was explored. The present research achievements can provide a good theoretical basis for the further application on controlling profile forming with the chord angle measurement.

837

The Approaches for Estimation of Grain Size in Digital Steel Microscopic Image

Authors: Qiu Dong Sun, Yong Ping Qiu, Wen Xin Ma, Wen Ying Yan

Abstract: The estimation of grain size is the important basis of metallographical analysis. The definitions of grain size, area, average area, chord, major axis, minor axis, diameter and average diameter are given in this article. A filling-and-elimination counting method is also introduced to count the number of grains in the digital steel microscopic image. The equations for calculating average area and diameter of grains are presented too. Finally, an algorithm for calculating grain’s average diameter is given. The experimental results show that the proposed approaches are efficient and practical.

466

Stereological and Statistical Evaluation of Grain Size in Experimental Ni-Based and Conventional Supercoarse Sintered Carbides

Authors: Janusz Richter, Marian Maliński

Abstract: Chemical composition and technology of experimental Ni based binder-tungsten carbide particles composite have been worked out to increase corrosion resistance of conventional supercoarse WC-Co type sintered carbides. All the sintered WC cermets, both with Co and Ni-based binding phase have been manufactured using identical supercoarse WC powder. Grain size evaluation was performed using light microscope images and grain chord length measurements, samples of commercial WC-Co coarse and supercoarse grades being included into analysis for comparison purposes. The obtained statistical and geometrical distributions of the chord length revealed certain differences. The performed statistical analysis allowed to state that the investigated experimental grades of Ni-based sintered WC carbides are materials of microstructure significantly more coarse than the reference coarse commercial grade (i.e. they can be classified into supercoarse group of sintered carbides).

143

Crystallography of Growth Blocks in Spheroidal Graphite

Authors: Etienne Brodu, Emmanuel Bouzy, Jean Jacques Fundenberger, Benoit Beausir, Lydia Laffont, Jacques Lacaze

Abstract: A better understanding of spheroidal graphite growth is expected in a near future thanks to widespread use of transmission electron microscopy. However, common transmission electron microscopy is quite time consuming and new indexing techniques are being developed, among them is transmission Kikuchi diffraction in a scanning electron microscope, a recent technique derived from electron backscatter diffraction. In the present work, on-axis transmission Kikuchi diffraction in scanning electron microscope, completed by transmission electron microscopy, was used with the objective of producing new observations on the microstructure of spheroidal graphite. This study shows that disorientations between blocks and sectors in spheroidal graphite are quite large in the early growth stage, which may be indicative of a competition process selecting the best orientations for achieving radial growth along the c direction of graphite.