通过向黄铜中添加共晶铸铁,在熔铸过程中原位生成渗碳体颗粒,利用石墨化退火工艺使渗碳体分解成石墨从而制得石墨黄铜。利用SEM和EDS分析石墨黄铜的显微组织,探讨显微组织与切削性能的关系。结果表明:铸态黄铜中的渗碳体颗粒经过退火后全部分解为石墨颗粒,石墨颗粒均匀弥散地分布在黄铜基体上,其平均尺寸为5.0μm,体积分数约为1.1%。石墨黄铜的车削表面光滑无毛刺,切屑形貌为短C型,比铅黄铜的粗大,但优于普通黄铜的长螺旋型屑。 By adding eutectic cast iron to brass, cementite particles are generated in situ during the casting process, and the graphite brass is prepared by decomposing the cementite into graphite by a graphitizing annealing process. The microstructure of graphite brass was analyzed by SEM and EDS, and the relationship between microstructure and cutting performance was discussed. The results show that the cementite particles in the as-cast brass are all annealed and then decomposed into graphite particles. The graphite particles are distributed uniformly on the brass matrix with the average size of 5.0 μm and the volume fraction of about 1.1%. Graphite brass turning surface smooth and burr-free, chip appearance is short C-type, thicker than the lead brass, but superior to the long spiral common brass crumbs.