| Effect of Solidification Interface Morphologies on Microstructures of a Ni-base Superalloy |
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| 引用本文： | 史正兴,李建平,傅恒志. Effect of Solidification Interface Morphologies on Microstructures of a Ni-base Superalloy[J]. 材料科学技术学报, 1990, 6(3): 167-172 |
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| 作者姓名： | 史正兴 李建平 傅恒志 |
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| 作者单位： | Northwestern Polytechnical University Xi'an，710032，China，Xi'an Institute of Technology，Xi'an，710032，China.，Northwestern Polytechnical University，Xi'an，710032，China |
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| 摘 要： | A cast Ni-base superalloy K5 wasdirectionally solidified and various solidification in-terfaces including plane front,cellular,cellular-dendritic and dendritic were obtained in awider range of G/R ratio by using improved highwithdrawal device and liquid metal cooling experi-mental sets.The precipitation pattern of some prin-cipal phases of the alloy and correlation of the vari-ous interfaces with microstructure were studied sys-tematically.It was indicated that the morphology ofsolidification interface of superalloy K5 varied withG/R ratio and that the solidification interfacemorphologies have a considerable effect on the fea-tures of phases both precipitated duringsolidification and post-solidification.Plane frontand cellular directional solidification of superalloyK5 lead to a substantial decrease of MC carbideand elimination of γ-γ'eutectic,but makeneedle-shape M_6C carbide precipitate easily duringageing treatment.The finer dendritic structuressolidified under the condition of higher cooling ratehave less dendritic segregation and idealmicrostructure.
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| 收稿时间： | 1990-05-28 |
Effect of Solidification Interface Morphologies on Microstructures of a Ni-base Superalloy |
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| SHI Zhengxing LI Jianping FU Hengzhi Northwestern Polytechnical University,Xi''an,,China.Xi''an Institute of Technology,Xi''an,,China.. Effect of Solidification Interface Morphologies on Microstructures of a Ni-base Superalloy[J]. Journal of Materials Science & Technology, 1990, 6(3): 167-172 |
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| Authors: | SHI Zhengxing LI Jianping FU Hengzhi Northwestern Polytechnical University Xi''an China.Xi''an Institute of Technology Xi''an China. |
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| Abstract: | A cast Ni-base superalloy K5 was directionally solidified and various solidification in- terfaces including plane front,cellular, cellular-dendritic and dendritic were obtained in a wider range of G/R ratio by using improved high withdrawal device and liquid metal cooling experi- mental sets.The precipitation pattern of some prin- cipal phases of the alloy and correlation of the vari- ous interfaces with microstructure were studied sys- tematically.It was indicated that the morphology of solidification interface of superalloy K5 varied with G/R ratio and that the solidification interface morphologies have a considerable effect on the fea- tures of phases both precipitated during solidification and post-solidification.Plane front and cellular directional solidification of superalloy K5 lead to a substantial decrease of MC carbide and elimination of γ-γ'eutectic,but make needle-shape M_6C carbide precipitate easily during ageing treatment.The finer dendritic structures solidified under the condition of higher cooling rate have less dendritic segregation and ideal microstructure. |
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| Keywords: | Ni-base superalloy solidification microstructure |
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