Effect of cooling rate on microstructure, microsegregation and mechanical properties of cast Ni-based superalloy K417G

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	Effect of cooling rate on microstructure, microsegregation and mechanical properties of cast Ni-based superalloy K417G
	Gong, L; Chen, B; Zhang, L; Ma, YC; Liu, K; Chen, B (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.
刊名	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
	2018-05-01
卷号	34 期号:5 页码:811-820
关键词	Nickel-based Superalloys Solidification Parameters Tensile Behavior Stress Rupture Segregation Evolution Deformation Porosity Turbine
ISSN号	1005-0302
英文摘要	The effects of different solidification rates after pouring on the microstructures, microsegregation and mechanical properties of cast superalloy K417G were investigated. Scheil-model was applied to calculate the temperature range of solidification. The casting mould with different casting runners was designed to obtain three different cooling rates. The microstructures were observed and the microsegregation was investigated. Also, high temperature tensile test was performed at 900 degrees C and stress rupture test was performed at 950 degrees C with the stress of 235 MPa. The results showed that the secondary dendrite arm spacing, microsegregation, the size and volume fraction of gamma' phase and the size of gamma/gamma' eutectic increased with decreasing cooling rate, but the volume fraction of gamma/gamma' eutectic decreased. In the cooling rate range of 1.42 degrees C s(-1)-0.84 degrees C s(-1), the cast micro-porosities and carbides varied little, while the volume fraction and size of gamma' phase and gamma/gamma' eutectic played a decisive role on mechanical properties. The specimen with the slowest cooling rate of 0.84 degrees C s(-1)showed the best comprehensive mechanical properties. (C) 2017 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.; The effects of different solidification rates after pouring on the microstructures, microsegregation and mechanical properties of cast superalloy K417G were investigated. Scheil-model was applied to calculate the temperature range of solidification. The casting mould with different casting runners was designed to obtain three different cooling rates. The microstructures were observed and the microsegregation was investigated. Also, high temperature tensile test was performed at 900 degrees C and stress rupture test was performed at 950 degrees C with the stress of 235 MPa. The results showed that the secondary dendrite arm spacing, microsegregation, the size and volume fraction of gamma' phase and the size of gamma/gamma' eutectic increased with decreasing cooling rate, but the volume fraction of gamma/gamma' eutectic decreased. In the cooling rate range of 1.42 degrees C s(-1)-0.84 degrees C s(-1), the cast micro-porosities and carbides varied little, while the volume fraction and size of gamma' phase and gamma/gamma' eutectic played a decisive role on mechanical properties. The specimen with the slowest cooling rate of 0.84 degrees C s(-1)showed the best comprehensive mechanical properties. (C) 2017 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
学科主题	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
语种	英语
公开日期	2018-06-05
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79333]
专题	金属研究所_中国科学院金属研究所
通讯作者	Chen, B (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.
推荐引用方式 GB/T 7714	Gong, L,Chen, B,Zhang, L,et al. Effect of cooling rate on microstructure, microsegregation and mechanical properties of cast Ni-based superalloy K417G[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2018,34(5):811-820.
APA	Gong, L,Chen, B,Zhang, L,Ma, YC,Liu, K,&Chen, B .(2018).Effect of cooling rate on microstructure, microsegregation and mechanical properties of cast Ni-based superalloy K417G.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,34(5),811-820.
MLA	Gong, L,et al."Effect of cooling rate on microstructure, microsegregation and mechanical properties of cast Ni-based superalloy K417G".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 34.5(2018):811-820.