Inoculation can reduce the chill depth of a chilled iron,and therefore influence the microstructure and properties of the iron.In this paper,the effect of rare earth Lanthanun (La) on the microstructure and properties of a chilled iron camshaft was studied.The results show that the La addition efficiently enhances the mechanical properties,yet with the unfavorable effect of decreasing the chilled depth and hardness.Moreover,La promotes graphite concentration and results in large graphite size,as well as A-type graphite.It is also found that excessive La destroys the interconnection and directivity of ledeburite.According to the experimental results,the optimum adding content of La should be no more than 0.02wt.%.
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