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| Effect of Strain Rate on the Low Cycle Fatigue Properties of Re-free Nickel-base Single Crystal Superalloy |
| ZHANG Xiaoqiang, WANG Dong, ZHANG Jian, LOU Langhong |
| Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016 |
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Cite this article:
ZHANG Xiaoqiang WANG Dong ZHANG Jian LOU Langhong. Effect of Strain Rate on the Low Cycle Fatigue Properties of Re-free Nickel-base Single Crystal Superalloy. Chin J Mater Res, 2011, 25(3): 231-236.
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Abstract Low cycle fatigue (LCF) behavior of a Re-free nickel-base single crystal superalloy at different strain rates (5×10−4s−1, 1×10−3s−1, 5×10−3s−1 and 1×10−2s−1) has been investigated at 1223 K. It was found that the alloys were cyclically stable at all strain rates. With the increasing of strain rate, the low cycle fatigue life increased, and the area of cycle hysteresis loop at N=1/2Nf decreased, indicating that more creep deformation was happened at low strain rate. All fatigue cracks initiated at
the surface. With the increasing of strain rate, the areas of instantaneous rupture region decreased on the fracture surface due to the suppressed creep. At low strain rate, extensive creep led to more slip systems working and forming networks. On the contrary, dislocation bundle was formed at high strain rate.
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Received: 03 March 2011
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| Fund: Supported by National Natural Science Foundation of China No.50931004 and National Key Basic Research and Development Program of China No.2010CB631201. |
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