Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 603, Issue -, Pages 84-92Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2014.02.073
Keywords
Low-cycle fatigue; Single-crystal superalloy; Fatigue life; Plastic deformation mechanisms; Dislocation
Categories
Funding
- National Basic Research Program of China [2010CB631206]
- National Natural Science Foundation of China (NSFC) [51001104, 50931004, U1037601]
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The effects of Re on low-cycle fatigue (LCF) behaviors of single-crystal superalloys can be summarized mainly in the following aspects. On one hand, the addition of Re strongly retards the coarsening process of gamma'-Ni3Al phase and maintains the uniformity of the phase structure. On the other hand, the Re addition can promote the segregation, which usually increases the lattice mismatch of the superalloy and further impedes any individual dislocation to move in the gamma-Ni matrix freely and induces the activation of more dislocation movement by a combined glide-climb process. All these factors have improved the LCF properties of single-crystal superalloys at 900 degrees C, for instance, the deformation becomes more homogeneous, the strengthening of gamma' phase is more effective and therefore the fatigue life becomes longer due to the addition of Re. (C) 2014 Elsevier B.V. All rights reserved.
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