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Effect of Si on Microstructure and Wear Resistance of Hypereutectic High-Chromium Cast Iron.
- Source :
- Journal of Materials Engineering & Performance; Jun2023, Vol. 32 Issue 12, p5450-5465, 16p
- Publication Year :
- 2023
-
Abstract
- The effect of Si on the microstructure and properties of hypereutectic high-chromium cast iron was investigated. The results show that Si is only solid-dissolved in the matrix, and the content of Si is higher in the matrix near the edge of the primary carbide. As the Si content increased from 0.5 to 2.6%, the primary carbides in hypereutectic high-chromium cast iron were significantly refined, and the refining mechanism was verified by first-principles calculations. The increase of silicon content also leads to the increase of carbide volume fraction from 52.4 to 63.9%, the decrease of austenite volume fraction from 45.8 to 2.0%, and the matrix structure gradually transforms from γ-Fe to α-Fe. After hypereutectic high-chromium cast iron was quenched at 1050 °C, a large amount of secondary carbides were precipitated in the matrix and the precipitation of secondary carbides decreased significantly with the increase of silicon content. After quenching at 1050 °C, the hardness of hypereutectic high-chromium cast iron increased significantly, but the hardness of high-silicon (1.9Si and 2.6Si) samples did not change significantly. Increasing the quenching temperature and prolonging the holding time can significantly improve the hardness of high-silicon samples. The increase of silicon content can significantly improve the wear resistance of hypereutectic high-chromium cast iron. When the silicon content exceeds 1.9%, the wear resistance decreases. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10599495
- Volume :
- 32
- Issue :
- 12
- Database :
- Complementary Index
- Journal :
- Journal of Materials Engineering & Performance
- Publication Type :
- Academic Journal
- Accession number :
- 164397528
- Full Text :
- https://doi.org/10.1007/s11665-022-07475-z