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Microstructure and Stress-Rupture Property of Large-Scale Complex Nickel-Based Single Crystal Casting

Acta Metallurgica Sinica(English Letters) 2018年第8期31卷 887-896页

作者： Min Huang Gong Zhang Dong Wang Jia-Sheng Dong Li Wang Lang-Hong Lou Institute of Metal Research Chinese Academy of SciencesShenyang 110016China University of Chinese Academy of Sciences Beijing 100049China

The microstructure and stress-rupture property of the large-scale complex single crystal（SX） casting DD10 were investigated in high-rate solidification process. It is found that the primary dendrite arm spacing（PDAS） does not increase monotonically with the height increase. When across the platform, the temperature gradient increases due to the effect of platform, and the corresponding PDAS decreases. The distribution of eutectic volume fraction in large-scale complex SX casting is affected by PDAS, solid back diffusion, and the development of high order dendrites. The eutectic volume fraction contained in the sample taken below the platform decreases with the height increase. While the eutectic volume fraction contained in the sample taken upper the platform increases gradually with the height increase. After heat treatment,most of the γ/γ＇ eutectics are eliminated and the components are distributed uniformly. The similar stress rupture properties of the samples at different heights in the same direction are obtained.

关键词： Large-scale single crystal Platform primary dendrite arm spacing Eutectic volume fraction Stress-rupture property

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Effect of abruptly changing withdrawal rate on solidification microstructure in directionally solidified Al-4.5wt%Cu alloy

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China Foundry 2014年第1期11卷 8-13页

作者： Yang Luyan Li Shuangming Zhong Hong Ren Ruohua Fu Hengzhi State Key Laboratory of Solidif ication Processing Northwestern Polytechnical University

Al-4.5wt.%Cu alloy has been directionally solidified at constant and abruptly changing withdrawal rates, respectively. The effects of the withdrawal rate on solidification microstructure, primary dendrite arm spacing(PDAS) and liquid solute distribution in front of the solid-liquid interface were investigated. The experimental results for the PDAS at a constant withdrawal rate agree well with the values calculated by the Hunt, Trivedi and Hunt-Lu models. At an abrupt change in the withdrawal rate, the maximum to minimum ratio of the PDAS at a given solidification parameter, i.e. λ1max/λ1min, is more than 2, and the PDAS values are remarkably history-dependent. Further, the liquid-solute distribution curve based on theoretical calculation shows that the larger the initial withdrawal rate is, the smaller the minimum of liquid solute concentration in front of the solid-liquid interface is after the abrupt change in withdrawal rate.

关键词： directional solidifi cation abrupt change of withdrawal rate primary dendrite arm spacing liquid-solute distribution Al-4.5wt.%Cu alloy

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