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The Broadening of Crystallographic Orientation Distribution in Crept Ni-base Superalloys

  • Toru Inoue (a1), Katsushi Tanaka (a2), Hiroki Adachi (a3), Kyosuke Kishida (a4) and Haruyuki Inui (a5)...

Abstract

The crystallographic orientation distribution, and its change accompanied with tilting γ/γ boundaries in Ni-based single crystal superalloys have been investigated by a theoretical elastic-plastic calculation, X-ray diffractometry and SEM-EBSD analysis. The distribution of the crystallographic orientation has significantly broadened by creep deformations. The broadening can be explained by an unbalance of the amount of creep dislocations of each slip system, which agrees with the result of elastic-plastic calculations. Creep strain of superalloys crept at a condition forming the raft structure can be estimated by the measurement of the width of rocking curve of a diffraction peak.

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