کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7951994 | 1513704 | 2018 | 26 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of cooling rate on microstructure, microsegregation and mechanical properties of cast Ni-based superalloy K417G
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
شیمی مواد
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چکیده انگلیسی
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 °C and stress rupture test was performed at 950 °C with the stress of 235 MPa. The results showed that the secondary dendrite arm spacing, microsegregation, the size and volume fraction of γⲠphase and the size of γ/γⲠeutectic increased with decreasing cooling rate, but the volume fraction of γ/γⲠeutectic decreased. In the cooling rate range of 1.42 °C sâ1-0.84 °C sâ1, the cast micro-porosities and carbides varied little, while the volume fraction and size of γⲠphase and γ/γⲠeutectic played a decisive role on mechanical properties. The specimen with the slowest cooling rate of 0.84 °C sâ1 showed the best comprehensive mechanical properties.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Materials Science & Technology - Volume 34, Issue 5, May 2018, Pages 811-820
Journal: Journal of Materials Science & Technology - Volume 34, Issue 5, May 2018, Pages 811-820
نویسندگان
Li Gong, Bo Chen, Long Zhang, Yingche Ma, Kui Liu,