Grain refinement of as cast superalloy K4169 solidified with low voltage pulsed magnetic field

被引：2

作者：

Teng, Y. F. ^{[1
]}

Feng, X. H. ^{[1
]}

Li, Y. J. ^{[1
]}

Yang, Y. S. ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China

来源：

MATERIALS RESEARCH INNOVATIONS | 2014年 / 18卷

基金：

中国国家自然科学基金;

关键词：

Grain refinement; Superalloy; Pulsed magnetic field; Solidification; MAGNESIUM ALLOY; IN718; AL;

D O I：

10.1179/1432891714Z.000000000834

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The solidification behaviour and the as cast structure of superalloy K4169 ingots solidified with a low voltage pulsed magnetic field (LVPMF) were investigated by experiments and modelling. The experimental results showed that complete fine equiaxed grains in ingots of diameter 95 mm were obtained by applying an LVPMF. Dendrite tips in the as cast structure were rounded due to the release of latent heat and the concentration of the Joule heating effect on the dendrite tips. The solidification procedure was simulated in order to investigate the grain refinement mechanism. The simulation results show that the LVPMF has electromagnetic convection and electromagnetic vibration effects on the alloy melt. Grain refinement was considered as the result of the magnetic force and melt flow during solidification. Based on the experimental and simulation results, a refining mechanism was proposed for nucleus multiplication by melt vibration and convection, which contributes to heterogeneous nucleation enhancement and leads to high nucleation rate and grain refinement.

引用

页码：352 / 356

页数：5

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