根据美国的研究成果,说是增大钥高速钢中的Si的百分比,可改善其性能。通常含Si量在0.2～0.3％,碳化物M_2c易成棒状,若Si=0.5～1.0％,就成M_6C稳定球状,可提高热处理性能。为获得最高回火硬度 (HRC67),淬火温度可稍低一些(1150～1200℃)。奥氏体晶粒度变细。含Si量高至1％时与原低Si相比的冲击值几乎没有什么变化。只是当Si 增大到1.25％时,冲击值才显著降低。据此认为,Mo高速钢中的含 According to the research done by the United States, it is said that increasing the percentage of Si in HSS can improve its performance. Generally, the content of Si is 0.2-0.3%. The carbide M 2c is easy to form a rod shape. If Si = 0.5-1.0%, it becomes a stable spherical M_6C, which improves the heat treatment performance. To obtain the highest tempering hardness (HRC67), quenching temperature may be slightly lower (1150 ~ 1200 ℃). Austenite grain size becomes thinner. There was little change in the impact value with respect to the original low Si when the Si content was as high as 1%. Only when Si increased to 1.25%, the impact value was significantly reduced. According to this, Mo-containing high-speed steel containing