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Effect of Hole Diameter on Tensile Behavior of a Ni-base Single Crystal Superalloy DD33 |
ZHOU Zhongjiao, LIU Tao, ZHANG Gong, WANG Li**( ), LOU Langhong |
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China |
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Cite this article:
ZHOU Zhongjiao, LIU Tao, ZHANG Gong, WANG Li, LOU Langhong. Effect of Hole Diameter on Tensile Behavior of a Ni-base Single Crystal Superalloy DD33. Chinese Journal of Materials Research, 2016, 30(5): 343-347.
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Abstract Plate tensile specimens were machined from a Ni-base single crystal (SC) superalloy DD33, holes with various diameters were electrochemically machined (ECM) in the middle of the specimens. The strain fields around the holes during room temperature tensile tests were in-situ observed by an ARAMIS - optical deformation analysis system based on the digital image correlation (DIC) technique and the fracture surface was observed by scanning electron microscope (SEM). It was demonstrated that the yield strength and ultimate tensile strength decreased with the increase of hole diameter from 0.5 mm to 0.9 mm. Strain concentrated in the vicinity of the hole. The maximum strain increased slightly during elastic deformation. However, once plastic deformation began, it increased rapidly above its elastic value. In addition, the maximum strain and strain gradients adjacent to the holes increased with the increase of the hole diameter from 0.5 mm to 0.9 mm. This work is critical for understanding the crack initiation around the cooling holes with different diameters in the SC blade.
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Received: 17 March 2015
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Fund: *Supported by National Natural Science Foundation of China No.51201164 and National High Technology Research and Development Program of China No.2012AA03A511 |
About author: **To whom correspondence should be addressed, Tel: (024)23971276, E-mail: wangli@imr.ac.cn |
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