Effect of inoculating addition on machinability of gray cast iron  

作　　者：任凤章 李锋军 刘伟明 马战红 田保红 

机构地区：[1]School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471003,China [2]Henan Key Laboratory of Advanced Non-ferrous Metals,Luoyang 471003,China [3]Yituo Foundry Corporation,China Yituo Group Corporation Limited,Luoyang 471004,China

出　　处：《Journal of Rare Earths》2009年第2期294-299,共6页稀土学报（英文版）

基　　金：supported by Program for Scientific and Technological Renovation Talents in University of Henan Province (2009HASTIT023);the National Natural Science Foundation of China (50771042)

摘　　要：Gray cast irons were inoculated with FeSi75＋RE and FeSi75＋Sr inoculants. The changes of apex angle of the drills before and after being used were used to evaluate machinability of gray cast irons. Effect of FeSi75＋RE and FeSi75＋Sr inoculants on mechanical properties, machinability and sensibility of gray cast iron used in cylinder block were investigated. Experimental results showed that gray cast iron treated with 60%FeSi75＋40% RE inoculants exhibited tensile strength consistently at about 295 MPa along with good hardness and improved metallurgical quality. While gray cast iron inoculated with 20%FeSi75＋80% Sr inoculants exhibited the best machinability, the lowest cross-section sensibility and the least microhardness difference. The tool flank wear of the drill increased correspondingly with the increase of the microhardness difference of the matrix, indicating the great effect of homogeneity of the matrix on the machinability of gray cast iron.Gray cast irons were inoculated with FeSi75＋RE and FeSi75＋Sr inoculants. The changes of apex angle of the drills before and after being used were used to evaluate machinability of gray cast irons. Effect of FeSi75＋RE and FeSi75＋Sr inoculants on mechanical properties, machinability and sensibility of gray cast iron used in cylinder block were investigated. Experimental results showed that gray cast iron treated with 60%FeSi75＋40% RE inoculants exhibited tensile strength consistently at about 295 MPa along with good hardness and improved metallurgical quality. While gray cast iron inoculated with 20%FeSi75＋80% Sr inoculants exhibited the best machinability, the lowest cross-section sensibility and the least microhardness difference. The tool flank wear of the drill increased correspondingly with the increase of the microhardness difference of the matrix, indicating the great effect of homogeneity of the matrix on the machinability of gray cast iron.

关 键 词：gray cast iron compound inoculants MACHINABILITY rnicrohardness difference cross-section sensibility HOMOGENEITY rare earths 

分 类 号：TG143[一般工业技术—材料科学与工程]