Phase precipitation and segregation behavior of nickel based superalloy GH4151 |
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Authors: | XU Zhiqiang YANG Shufeng ZHAO Peng QU Jinglong GU Yu |
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Affiliation: | (1.School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;2.State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China;3.Department of Wrought Superalloy Product, Beijing CISRI GAONA Materials and Technology Co., Ltd., Beijing 100083, China |
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Abstract: | The element segregation behavior, as cast microstructure characteristics and precipitation phase types of GH4151 alloy were studied by electron probe microanalysis (EPMA), field emission scanning electron microscopy (SEM) and differential thermal analysis (DTA), and the solidification process of the alloy was discussed. During the solidification of GH4151 alloy, element W is segregated to the dendrite cores, elements Mo, Nb and Ti are segregated to the interdendritic regions, and elements Co, Cr, Al are not segregated, elements Nb and Ti are biased more heavily. The core of GH4151 ingot is coarse equiaxed grains, whose main precipitated phases include γ′, MC carbide, η phase, (γ+γ′) eutectic phase and Laves phase. At the end of solidification, low temperature brittle phases such as η phase, (γ+γ′) eutectic phase and Laves phase are formed, which enlarge the solidification range and increase the hot cracking sensitivity of the alloy. |
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Keywords: | Key words:nickel based superalloy GH4151 segregation microstructure brittle phase |
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