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Effect of Skew Angle of Holes on the Thermal Fatigue Behavior of a Ni-based Single Crystal Superalloy
Zhou, Zhong-Jiao; Yu, Da-Qian; Wang, Li; Lou, Lang-Hong; Wang, L (reprint author), Chinese Acad Sci, Inst Met Res, Superalloys Div, Shenyang 110016, Peoples R China.
2017-02-01
Source PublicationACTA METALLURGICA SINICA-ENGLISH LETTERS
ISSN1006-7191
Volume30Issue:2Pages:185-192
AbstractIn 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.; 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.
description.department[zhou, zhong-jiao ; wang, li ; lou, lang-hong] chinese acad sci, inst met res, superalloys div, shenyang 110016, peoples r china ; [zhou, zhong-jiao] tsinghua univ, div micro nano mfg, state key lab tribol, beijing 100084, peoples r china ; [yu, da-qian] beijing huatsing gas turbine & igcc technol co lt, mat design & res sect, tsinghua sci pk, beijing 100084, peoples r china
KeywordNi-based Single Crystal Superalloy Thermal Fatigue Properties Holes Skew Angles Cracks
Subject AreaMetallurgy & Metallurgical Engineering
Funding OrganizationNational Natural Science Foundation of China [51201164]; National High Technology Research and Development Program of China [2012AA03A511]
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/78303
Collection中国科学院金属研究所
Corresponding AuthorWang, L (reprint author), Chinese Acad Sci, Inst Met Res, Superalloys Div, Shenyang 110016, Peoples R China.
Recommended Citation
GB/T 7714
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.
APA Zhou, Zhong-Jiao,Yu, Da-Qian,Wang, Li,Lou, Lang-Hong,&Wang, L .(2017).Effect of Skew Angle of Holes on the Thermal Fatigue Behavior of a Ni-based Single Crystal Superalloy.ACTA METALLURGICA SINICA-ENGLISH LETTERS,30(2),185-192.
MLA Zhou, Zhong-Jiao,et al."Effect of Skew Angle of Holes on the Thermal Fatigue Behavior of a Ni-based Single Crystal Superalloy".ACTA METALLURGICA SINICA-ENGLISH LETTERS 30.2(2017):185-192.
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