Effects of tantalum on microstructure and mechanical properties of cast IN617 alloy

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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.
刊名	ELSEVIER SCIENCE SA
	2017-10-26
卷号	706 页码:153-160
关键词	Ni-based Superalloys Ta Carbides Mechanical Properties Solid Solution Strengthening
ISSN号	0921-5093
英文摘要	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.; 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.
学科主题	Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
语种	英语
资助机构	NSFC (National Natural Science Foundation of China) [51571191]
公开日期	2018-01-10
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79032]
专题	金属研究所_中国科学院金属研究所
通讯作者	Zhou, LZ (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.
推荐引用方式 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.