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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.
2018-05-01
Source PublicationJOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN1005-0302
Volume34Issue:5Pages:811-820
AbstractThe 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.
description.department[gong, li ; chen, bo ; zhang, long ; ma, yingche ; liu, kui] chinese acad sci, inst met res, shenyang 110016, liaoning, peoples r china
KeywordNickel-based Superalloys Solidification Parameters Tensile Behavior Stress Rupture Segregation Evolution Deformation Porosity Turbine
Subject AreaMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/79333
Collection中国科学院金属研究所
Corresponding AuthorChen, B (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.
Recommended Citation
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.
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