Effect of the Cr/C on Microstructure and Wear Resistance of Medium Chromium Cast Iron Compound Wear-resistant Roll Ring
Author of the article:ZHAI Chenchen;SU Hengbo;GUO jia;SU Yueying;CHEN Xiangru;ZHAI Qijie
Author's Workplace：School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China;Jining Antai Mine Equipment Manufactttring Limited Company,Jining 232300,China
Key Words：medium chromium cast iron compound wear-resistant roll ring Cr/C the (Cr,Fe)7C3 carbide wear resistance
Abstract：
The outer layer of medium chromium cast iron plays the main role of wear resistant and crush materials in the service process of the medium chromium cast iron compound wear-resistant roll ring. The effect of Cr/C on the microstructure, mechanical properties and wear resistance of medium chromium cast iron were studied. The results show that the form and quantity of carbides are affected by the difference of Cr/C. When the ratio of Cr/C is higher(3.17), the carbides are mainly composed of the(Cr, Fe)7C3which like chrysanthemum and dispersive bulk, the area ratio of carbides is 8.90%, the impact toughness is 8.6 J and the hardness is 52 HRC;when the ratio of Cr/C is lower(2.66), the carbides are mainly composed of the(Fe, Cr)3C like nets and the(Cr, Fe)7C3lath-shaped, the area ratio of carbides is 13.31%, the impact toughness is 5.3 J and the hardness is 56 HRC. When the Cr/C is higher, the abrasive wear resistance is better. It can relieve stress concentration during wear process and delay the spalling of debris because of its high toughness.
