材料期刊网

添加铜、硫可以明显提高高铬钢的机械加工性能,且铜、硫对高铬钢的机械加工性能的作用类似.通过高分辨透镜(HREM)和扫描电镜(SEM)对含铜高铬钢中的易切削相进行分析.研究发现,含铜高铬钢中的易切削相是大小为10 nm左右的石墨-铜复合相,该相均匀弥散地分布于含铜高铬钢基体中,该相中76.07％的原子是石墨碳,其余则为铜原子.在机械加工时,石墨-铜复合相的固体润滑膜能够附着在刀具的切削刃上,从而避免了含铜高铬钢与切削刃的直接接触,从而减少了切削刃的磨损,改善了高铬钢的切削性能.

The machinability of high Cr steel can be improved obviously by adding Cu and S.The effect of addition of Cu on the machinability of high-Cr steel is similar to that of addition of S.By means of SEM and HREM,the distribution and size of free cutting phase in high-Cr steel containing Cu were studied.The results show that the free cutting phase is graphite-copper composite phase and its size is about 10 nm.The graphite-copper phase disperses in the steel.The atomic fraction of graphite in graphite copper composite phase is 76.07％,and the rest is Cu.During machining,graphite-copper composite phase services as a solid lubricant and covers cutting edge,which avoids direct contact between cutting edge and high-Cr steel containing,reduces wear of tool and improves machinability of high-Cr steel.