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The Relationship between Nodular Corrosion Resistance and Grain Orientation of Zircaloy-4
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Institute of materials, Shanghai University

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    Abstract:

    The relationship between oxide thickness and grain orientations was investigated using Zircaloy-4 coarse-grained specimens corroded at 500 ℃/10.3 MPa in superheated steam. The results indicate that the growth of the oxide films formed on Zircaloy-4 specimens shows remarkably anisotropic characteristics. The growth rate of the oxide films formed on the grain surfaces with the orientation between prismatic plane of (10-10) and (11-20) was fastest, and the nodular corrosion spots were formed earlier after 3 h exposure. The grain surfaces with the orientation whose poles were located at the middle of inverse pole figure started to form the nodular corrosion spots for 30 h exposure gradually. The thinnest oxide layers were detected on the grain surfaces with the orientation nearby basal plane (0001), and the nodular corrosion spots did not appeared after 30 h exposure. The experimental results show that the nodoular corrosion resistance of Zircaloy-4 is closely related to the grain orientations when the distribution and the size of second phase particles, and the solid solution content of Fe and Cr alloying elements in α-Zr matrix are at the same level.

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[Chen Chuanming. The Relationship between Nodular Corrosion Resistance and Grain Orientation of Zircaloy-4[J]. Rare Metal Materials and Engineering,2016,45(12):3213~3217.]
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History
  • Received:September 15,2014
  • Revised:October 11,2014
  • Adopted:November 21,2014
  • Online: February 06,2017
  • Published: