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Effects of tantalum on microstructure and mechanical properties of cast IN617 alloy
Gao, Shuang; Hou, Jieshan; Yang, Fei; Guo, Yongan; Wang, Changshuai; Zhou, Lanzhang; Zhou, LZ (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.
2017-10-26
Source PublicationELSEVIER SCIENCE SA
ISSN0921-5093
Volume706Pages:153-160
AbstractEffects of Ta on microstructure and mechanical properties of cast IN617 alloy were investigated. The results showed that the addition of Ta increased size and area fraction of MC carbides, which was in agreement with the prediction of thermodynamic calculation, rather than influencing as-cast microstructure features such as grain size, secondary dendrite arm spacing, and carbide distribution. Ta-doped cast microstructure showed that Ti (C, N) nitride-carbide was substituted by MC carbide and at the same time, M6C and MC tended to form a eutectic structure. The lattice constant of the matrix in a heat treatment condition increased from 3.593 to 3.601 nm and the high temperature tensile strength also improved, when Ta content are from 0 to 2.0 wt%. It was attributed to the solution of Ta with solid solution strengthening in the matrix. However, when the Ta level exceeded 1.0 wt%, the ductility and fracture toughness significantly reduced. It was believed that remained Ta-rich MC carbides in the supersaturated matrix accelerated the initiation and propagation of cracks. Therefore, the optimized Ta content in cast IN617 alloy is suggested to below 1.0 wt% for balanced properties.; Effects of Ta on microstructure and mechanical properties of cast IN617 alloy were investigated. The results showed that the addition of Ta increased size and area fraction of MC carbides, which was in agreement with the prediction of thermodynamic calculation, rather than influencing as-cast microstructure features such as grain size, secondary dendrite arm spacing, and carbide distribution. Ta-doped cast microstructure showed that Ti (C, N) nitride-carbide was substituted by MC carbide and at the same time, M6C and MC tended to form a eutectic structure. The lattice constant of the matrix in a heat treatment condition increased from 3.593 to 3.601 nm and the high temperature tensile strength also improved, when Ta content are from 0 to 2.0 wt%. It was attributed to the solution of Ta with solid solution strengthening in the matrix. However, when the Ta level exceeded 1.0 wt%, the ductility and fracture toughness significantly reduced. It was believed that remained Ta-rich MC carbides in the supersaturated matrix accelerated the initiation and propagation of cracks. Therefore, the optimized Ta content in cast IN617 alloy is suggested to below 1.0 wt% for balanced properties.
description.department[gao, shuang ; hou, jieshan ; yang, fei ; guo, yongan ; wang, changshuai ; zhou, lanzhang] chinese acad sci, inst met res, shenyang 110016, liaoning, peoples r china ; [gao, shuang] univ chinese acad sci, beijing 100049, peoples r china
KeywordNi-based Superalloys Ta Carbides Mechanical Properties Solid Solution Strengthening
Subject AreaNanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Funding OrganizationNSFC (National Natural Science Foundation of China) [51571191]
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/79032
Collection中国科学院金属研究所
Corresponding AuthorZhou, LZ (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.
Recommended Citation
GB/T 7714
Gao, Shuang,Hou, Jieshan,Yang, Fei,et al. Effects of tantalum on microstructure and mechanical properties of cast IN617 alloy[J]. ELSEVIER SCIENCE SA,2017,706:153-160.
APA Gao, Shuang.,Hou, Jieshan.,Yang, Fei.,Guo, Yongan.,Wang, Changshuai.,...&Zhou, LZ .(2017).Effects of tantalum on microstructure and mechanical properties of cast IN617 alloy.ELSEVIER SCIENCE SA,706,153-160.
MLA Gao, Shuang,et al."Effects of tantalum on microstructure and mechanical properties of cast IN617 alloy".ELSEVIER SCIENCE SA 706(2017):153-160.
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