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In-situ Observation of Shrinkage Formation and Mechanism during Ni-based Superalloy Solidification
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Shanghai Institute of Ceramics,Chinese Academy of Sciences

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Ministry of Major Science & Technology of Shanghai(No.19DZ1100703); National Natural Science Foundation of China (No.51472263);Shanghai institute of ceramics, Chinese academy of sciences launched the fund in advance(No.Y82ZC8180G); Key laboratory of space manufacturing, Chinese academy of sciences(No.SMT-2019-004)

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    Abstract:

    Confocal laser scanning microscope(CLSM) was used to observe the solidification behavior of Nickel-based single crystal superalloy CMSX-4 in real time. SEM and EDS were used to study the micromorphology and element segregation characteristics of the solidified samples. Shrinkage and carbide formation were observed during alloy solidification. There are three types of shrinkages: square shrinkages, pentagonal star shrinkages and angular shrinkages. The formation mechanism of the three shrinkages is disccused, which is mainly related to the shape of the enclosed area surrounded by the secondary dendrite arms growing in different directions. In addition, carbides are found to be composed of two forms, namely flocculent carbide and lath carbide. Hf elements are enriched in flocculent carbides, while Cr elements are enriched in lath carbides.

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[Tongzhou Xu, Xiuhong Pan, Minghui Zhang, Meibo Tang, Huidong Li, Xuechao Liu. In-situ Observation of Shrinkage Formation and Mechanism during Ni-based Superalloy Solidification[J]. Rare Metal Materials and Engineering,2021,50(4):1113~1117.]
DOI:10.12442/j. issn.1002-185X.20200598

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History
  • Received:August 13,2020
  • Revised:November 05,2020
  • Adopted:November 27,2020
  • Online: May 08,2021
  • Published: