提高高铬白口铸铁磨球冲击抗力的技术关键

Technical Key Points of Improving Impact Resistance of Grinding Ball for High-Chromium White Cast Iron

当高铬白口铸铁含铬量为18%～28%,Cr/C值是8￣9,铸铁的显微组织是回火马氏体+少量残余奥氏体(<5%)+M7C3碳化物,则磨球具有高的冲击韧性和断裂韧性K1C,具有高的冲击抗力,表现出低的冲击剥落量。

When high-Cr white cast iron contains 18%～28% Cr and Cr/C value is 8～9, the microstructure is tempered martensite ＋ little retained austenite （〈5%） ＋ M7C3 carbide, and high impact toughness, high fracture toughness K1C, and high impact resistance and low spalling rate of grinding balls can be obtained.