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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10nm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。
Addition of copper and sulfur can obviously improve the machinability of high-chrome steel, and the effect of copper and sulfur on the machinability of high-chrome steel is similar. The free-cutting phase in high-chromium steel containing copper was analyzed by HREM and SEM. It is found that the free-cutting phase in the high-chromium steel containing copper is a graphite-copper composite phase with a size of about 10 nm. The phase is uniformly and dispersely distributed in the matrix of the copper-bearing high-chromium steel. 76.07% of the atoms in the phase are graphite carbon , The rest is copper atom. During machining, the solid lubricant film of the graphite-copper composite phase adheres to the cutting edge of the tool, thereby avoiding direct contact of the copper-bearing high-chrome steel with the cutting edge, reducing wear on the cutting edge and improving high chromium Steel cutting performance.