Effect of Y and Mg on the Solidification Structure of Fe-36Ni Invar Alloy
Source abstract
Abstract
Abstract The effect of Y and Mg on the solidification structure of Fe-36Ni invar alloy melted in a carbon tube furnace was investigated using digital camera, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The results showed that Y or Mg addition could remarkablly refine the solidification structure and increase the fraction of equiaxed grains. Great amount of high-melting point compounds (Y 2 O 2 S, MgS and MgS-MgO) formed in the alloy with the addition of Y and Mg respectively. Based on the theory of lattice misfit, the effectiveness of high-melting point compounds as heterogeneous nuclei of γ -matrix was calculated. The calculation of the lattice misfit between Y 2 O 2 S, MgS and γ -matrix, which were far less than 12%, showed that Y 2 O 2 S and MgS acted as heterogeneous nuclei were highly effective. However, MgO could not serve as the heterogeneous nuclei because the lattice misfit between it and γ -matrix exceeded 12%.
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Research context
OpenAlex topics: Microstructure and Mechanical Properties of Steels · High Temperature Alloys and Creep · Metal Alloys Wear and Properties
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Affiliations
State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
Technology Institute of Metallurgical, Baosteel Institute, Shanghai 201900, China
References
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