Effects of Zr Addition and Solidification Conditions on Solidification Microstructure of As-cast Fe-36Ni Invar Alloy AITranslate

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Chinese Library Classification Number:TG132.11[一般工业技术—材料科学与工程]

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Fe-36Ni invar alloys with different Zr content were prepared by smelting in a carbon tube furnace. The effects of Zr addition and solidification conditions on alloy solidification mierostrueture were investigated by SEM and EDS,and then the mechanism of solidification microstructure improvement was analyzed. The results show that alloy solidification microstructure is obviously refined after Zr addition. With the increase of Zr content, refinement effect of the solidification microstructure becomes better. A large number of high-melting-point compound ZrO2 is formed and dispersed in the alloy after Zr addition. The lattice misfit between ZrO2 （0001） surface and Fe-36Ni （100） surface is low,so ZrO2 can serve as effective heterogeneous nucleation core to refine the solidification microstructure of the invar alloy. Under the condition of adding the same content of rare earth element Y, the solidification microstructure is remarkably re- fined with decreased casting temperature and increased cooling speed. When casting temperature exceeds 1 500℃, the effect of Y2O2 S as heterogeneous nucleation core disappears, and the solidification microstructure of the alloy is composed of complete columnar grains.