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Grain Cluster Microstructure and Grain Boundary Character Distribution in Alloy 690

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Abstract

The effects of thermal-mechanical processing (TMP) on microstructure evolution during recrystallization and grain boundary character distribution (GBCD) in aged Alloy 690 were investigated by the electron backscatter diffraction (EBSD) technique and optical microscopy. The original grain boundaries of the deformed microstructure did not play an important role in the manipulation of the proportion of the Σ3n (n = 1, 2, 3…) type boundaries. Instead, the grain cluster formed by multiple twinning starting from a single nucleus during recrystallization was the key microstructural feature affecting the GBCD. All of the grains in this kind of cluster had Σ3n mutual misorientations regardless of whether they were adjacent. A large grain cluster containing 91 grains was found in the sample after a small-strain (5 pct) and a high-temperature (1100 °C) recrystallization anneal, and twin relationships up to the ninth generation (Σ39) were found in this cluster. The ratio of cluster size over grain size (including all types of boundaries as defining individual grains) dictated the proportion of Σ3n boundaries.

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Notes

  1. OIM is a trademark of EDAX; TSL and EDAX are a part of AMETEK, Inc., Materials Analysis Division, Mahwah, NJ.

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Acknowledgments

This work was supported by the Major State Basic Research Development Program of China (Grant No. 2006CB605001), the Innovation Foundation of Shanghai University (Grant No. A10-0110-08-004), and the Shanghai Leading Academic Discipline Project (Grant No. S30107). The authors are grateful to Dr. Qin Bai for assistance during the sample preparation.

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Authors and Affiliations

  1. Institute of Materials, School of Materials Science and Engineering, Shanghai University, P.O. Box 269, No. 149 Yanchang Road, Shanghai, 200072, People’s Republic of China

    Shuang Xia (Assistant Professor), Bangxin Zhou (Professor and Academician of Chinese Academy of Engineering) & Wenjue Chen (Associate Professor)

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  1. Shuang Xia
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  2. Bangxin Zhou
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  3. Wenjue Chen
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Correspondence to Shuang Xia.

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Manuscript submitted December 2, 2008.

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Xia, S., Zhou, B. & Chen, W. Grain Cluster Microstructure and Grain Boundary Character Distribution in Alloy 690. Metall Mater Trans A 40, 3016–3030 (2009). https://doi.org/10.1007/s11661-009-0035-7

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