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题名: Effect of Skew Angle of Holes on the Thermal Fatigue Behavior of a Ni-based Single Crystal Superalloy
作者: Zhou, Zhong-Jiao;  Yu, Da-Qian;  Wang, Li;  Lou, Lang-Hong
发表日期: 2017-2-1
摘要: In the present work, holes of various skew angles were electrochemically machined in the middle of the plate specimens in a Ni-based single crystal superalloy and crack initiation and propagation around holes during thermal fatigue cycles (20-1100 degrees C) were investigated. It was demonstrated that the skew angles had a significant effect on the initiation and propagation of thermal fatigue cracks. During thermal fatigue process, stress concentration occurred at the edge of the holes. As for skew angles, the maximum stress concentration appeared at the acute side of holes. The maximum stress concentration resulted in plastic deformation at the acute side of the 30 degrees hole, driving the thermal fatigue cracks to initiate after 220 cycles and propagate along [0 (1) over bar1] direction. However, the stresses concentrated at the edge of 90 degrees or 60 degrees holes were not large enough to initiate cracks even after 580 thermal cycles. This work will help to understand the local deformation behavior in the vicinity of cooling holes with various skew angles and have serious design implications for turbine blades.
刊名: ACTA METALLURGICA SINICA-ENGLISH LETTERS
Appears in Collections:中国科学院金属研究所_期刊论文

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Recommended Citation:
Zhou, Zhong-Jiao,Yu, Da-Qian,Wang, Li,et al. Effect Of Skew Angle Of Holes On The Thermal Fatigue Behavior Of A Ni-based Single Crystal Superalloy[J]. Acta Metallurgica Sinica-english Letters,2017,30(2):185-192.

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