Study on the Influence of Silicon and Aluminum on the Microstructure and Properties of Low Cobalt M42 High-Speed Steel

M42 HSS (W 2 Mo 9 Cr 4 VCo 8 ) is widely used as a high cobalt super-hard high-speed steel (HSS) for various cutting tool materials, but does not bring good economic benefits. In this paper, the effects of Si and Al on organization mechanical properties low were investigated. The microstructure was analyzed by OM, SEM, EDS, XRD, etc. Rockwell hardness test, impact toughness test flexural strength conducted. results study showed that only increasing content in containing 4.0% Co did significantly improve material properties, caused sharp deterioration toughness. After adding 1.0% to Co, can partially replace resulting more uniform diffuse carbide distribution. increased 68.3 HRC 13.8 Jꞏcm -2 , which has better overall meet processing requirements under actual working conditions.