磁感应强度对电磁离心铸造高铬铸铁的影响

Effects of Magnetic Induction Intensity on Microstructure and Propertiesof Electromagnetic Centrifugal Casting High Cr Cast Iron

为了提高高铬铸铁衬板的力学性能,使用电磁离心铸造浇注,并和常规重力离心铸造的试样进行了对比。结果表明,电磁离心铸造获得的试样组织明显细化,晶粒数量增多,晶粒尺寸细小,力学性能提高。当离心转速为1500r/min,磁感应强度为0.5T时,电磁离心铸造铸态试样的硬度(HRC)为55.3,冲击韧度为6.87J/cm2;热处理后的硬度(HRC)为65.3,冲击韧度达到7.3J/cm2。试样硬度比常规铸造试样提高了约10%,冲击韧度提高了约9%,相对耐磨性提高了约5%。

In order to improve mechanical properties of the high chromium cast iron liner,the specimens were produced by electromagnetic centrifugal casting,and were comparatively analyzed with conventional casting specimens.The results show that microstructure of the electromagnetic centrifugal casting specimens is refined significantly,and grains are increased with the decrease of the grain size,evidently improving the mechanical properties of the specimens.With centrifugal velocity of 1 500 r/min and magnetic induction intensity of 0.5 T,the hardness and impacting toughness of the electromagnetic centrifugal casting specimens reach HRC 55.3 and 6.87 J/cm2,respectively,and after heat treatment,hardness and impacting toughness reach HRC65.3 and 7.3 J/cm2,respectively.Compared with those of the conventional casting ones,hardness,impacting toughness and relative wear resistance of the specimens prepared are increased by 10%,8% and 5%,respectively.