Microtopography and Microstructure of High-Speed Steel Surfaceafter Gas Laser Cutting
The results of experimental studies of the surface roughness and microstructure of high-speed steel P6M5 after gas laser cutting are presented. It has been shown that the surface roughness parameters of the studied samples correspond to typical values of the surface roughness parameters after such types of machining as face milling or flat grinding. During gas laser cutting, a quenching zone with a length of up to 110 μm was formed in the near-surface layer, which has an increased microhardness up to 10600 ± 160 MPa. Short-term tempering in the temperature range A<sub>c1</sub>–620°С did not lead to the decomposition of martensite, the transition zone or tempering zone was not identified.