Effect of Si on Microstructure and Wear Resistance of Hypereutectic High-Chromium Cast Iron

被引：5
作者：
Chen, Zhengyang [1 ]
Fu, Hanguang [1 ]
Wang, Feng [2 ]
Yuan, Naibo [3 ]
Lin, Jian [1 ]
机构：
[1] Beijing Univ Technol, Sch Mat Sci & Engn, Res Inst Adv Mat Proc Technol, Key Lab Adv Funct Mat,Minist Educ, Amt 100, Beijing 100124, Peoples R China
[2] China Foundry Assoc, Beijing 100081, Peoples R China
[3] Xingtai Delong Machinery Roll Co Ltd, Xingtai 054000, Hebei, Peoples R China
来源：
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE | 2023年 / 32卷 / 12期
基金：
中国国家自然科学基金;
关键词：
hypereutectic high-chromium cast iron; microstructure evolution; silicon alloying; wear resistance; MECHANICAL-PROPERTIES; BEHAVIOR; SOLIDIFICATION; CARBIDE; SILICON;
D O I：
10.1007/s11665-022-07475-z
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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 gamma-Fe to alpha-Fe. After hypereutectic high-chromium cast iron was quenched at 1050 degrees 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 degrees 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.
引用
收藏
页码：5450 / 5465
页数：16
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