Metallurgical and Materials Transactions A

, Volume 41, Issue 3, pp 744–750 | Cite as

Macroregion Size Measurements in Bimodal Titanium Forgings Using Two-Dimensional Autocorrelation Method

  • Lotfi Toubal
  • Philippe Bocher
  • André Moreau
  • Daniel Lévesque
Article

Abstract

Etching patterns displayed on the surfaces of near-alpha titanium forgings (alloy IMI834) were quantified in terms of sizes and orientations using a two-dimensional (2-D) autocorrelation method. These patterns, which can be associated with local variations of microstructure and further related to regions of specific crystallographic orientations, are known to play a significant role in fatigue and dwell fatigue life predictions. It is then necessary to quantify their dimensions in a manufactured part in order to build a better statistical approach for life prediction in titanium forgings. These distributions of macroregion size and shape were examined on forging cross sections. A data analysis methodology based on a 2-D autocorrelation was used to process sample image data and quantify the macroregion characteristics. The results are more precise than those obtained using a mean linear intercept (MLI) method and additional useful information can be gathered.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2010

Authors and Affiliations

  • Lotfi Toubal
    • 1
  • Philippe Bocher
    • 2
  • André Moreau
    • 3
  • Daniel Lévesque
    • 3
  1. 1.Department of Mechanical EngineeringUniversité du Québec à Trois-RivièresTrois-RivièresCanada
  2. 2.Department of Mechanical EngineeringÉcole de Technologie SupérieureMontréalCanada
  3. 3.Industrial Materials InstituteNational Research Council of CanadaBouchervilleCanada

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