Effect of La content on solidification process and as-cast microstructure of GH5188 alloy

doi:10.13251/j.issn.0254-6051.2024.02.011

Abstract

Abstract: The solidification process of GH5188 alloy with different La contents (0.03%, 0.07%, 0.10% and 0.40%) at the cooling rate of 10 ℃/min was dynamic in-situ observed by using confocal laser scanning microscope (CLSM), and the effects of La content on the solidification process, as-cast microstructure and precipitated phases of the GH5188 alloy were studied. The results show that with the increase of La content, the initial solidification temperature and the solid-liquid two-phase region of the GH5188 alloy become higher and larger. The solidification process is slow-rapid-slow solidification, and the higher the La content, the smaller the peak solidification rate. With the increase of La content, the as-cast microstructure of the alloy changes from dendrite to equiaxed crystal, and the size of the precipitated phases increases. When the La content reaches 0.40%, the precipitated phases change from M₆C+M₂₃C₆ to (Ni,Co)_xLa+M₂₃C₆, and the formed La-containing intermetallic compound is easy to crack during solidification.

Key words: GH5188 alloy, rare earth element La, confocal laser scanning microscope (CLSM), solidification, microstructure

CLC Number:

TG132.32

Jiang Shichuan, Wang Xiaochuan, Tang Pingmei, Li Jing, Zhou Yang. Effect of La content on solidification process and as-cast microstructure of GH5188 alloy[J]. Heat Treatment of Metals, 2024, 49(2): 71-76.

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