镁对GH3625合金一次碳化物析出的影响

doi:10.13228/j.boyuan.issn0449-749x.20220060

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Abstract The mass percent of carbon in GH3625 alloy is about 0.05%. Because of the high content of Nb, Mo and Cr, carbides of MC, M₆C and M₂₃C₆ type will be formed in the alloy, and carbide segregation will easily occur due to the selective crystallization during solidification. Because of high redissolution temperature, carbide is difficult to eliminate in the wrought temperature range, which will lead to the problem of carbide banded aggregation in alloy bars and have a great influence on its service performance. Thermodynamic software of Thermal-calc was used to calculate and analyze the equilibrium precipitated phase and precipitation law of primary carbide in GH3625 alloy. The effect of Mg on the morphology, size and distribution of primary carbide in GH3625 alloy was studied by metallographic microscope and scanning electron microscope. The results show that the matrix of GH3625 alloy is a single austenite phase, and MC carbide, as a high temperature precipitated phase, precipitates directly from the liquid phase, which is rich in Nb, followed by a small amount of Ti, Mo and other elements. With the decrease of solidification temperature, the mass percent of Nb gradually increases. When Mg is not added, a large number of strip-shaped primary carbides are precipitated between secondary dendrites in GH3625 alloy, and their average diameter and area are large. After adding 0.014% Mg, Mg not only improves the distribution and morphology of carbides at interdendritic and grain boundary, but also reduces the size of primary carbides by changing the specific interfacial energy relationship between carbide phase and matrix phase. When the mass percent of Mg increases to 0.037%, the distribution of primary carbides is more uniform and dispersed, and the effect of refining and spheroidizing carbides by Mg is the best. At the same time, under the conditions of water cooling and air cooling, the cooling rate of experimental alloy is higher than that of furnace cooling, and the size of primary carbide precipitation is relatively smaller.

Key words： GH3625 alloy primary carbide Mg treatment type of cooling refining

Received: 17 January 2022

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	ZHANG Hong-liang
	GONG Wei
	JIANG Zhou-hua
	WANG Peng-fei

Cite this article:

ZHANG Hong-liang,GONG Wei,JIANG Zhou-hua等. Effect of magnesium on precipitation of primary carbide in GH3625 alloy[J]. Iron and Steel, 2022, 57(9): 148-155.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20220060 OR http://www.chinamet.cn/Jweb_gt/EN/Y2022/V57/I9/148

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