Microstructure of High Chromium Cast Iron Under the Perspective of Composite Material
Author of the article:ZHAO Yazhong;ZHI Xiaohui;ZHOU Xianhui;HUANG Jingbin
Author's Workplace：School of Mechanical and Automotive Engineering,Nanyang Institute of Tectmology,Nanyang 473004,China;School of Mechanical Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China
Key Words：heat treatment high chromium cast iron composite carbide
Abstract：
High chromium cast iron may be considered as a particulate reinforced composite which consists of matrix materials and reinforced phase. Abrasive wear of high chromium cast iron was analyzed from the perspective of materials composition. The results show that the carbides in high chromium cast iron protect the matrix from abrasive impact and wear, and the matrix fixes and supports the carbides to prevent the carbides from instability or being pulled out. The size of carbide is too small and it is easy to be cut off or dug out by connecting roots. If the carbide spacing is too large, the probability of abrasive falling on the matrix increases, and if the carbide spacing is too small, the matrix is difficult to be fixed and supported. Carbide volume fraction is too small to wear, too large to make the matrix too weak;The matrix properties of different structure types vary greatly, among which martensite matrix is the most wear-resistant but has poor toughness.
