Effect of Cold Pressing and Thermal Insulation Process on 65Mn Steel Body of Diamond Saw Blade
(1. School of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, China; 2. Ezhou Institute of New Materials, Hubei, Ezhou, 436000) Diamond saw blades rely on rigid body support cutters to cut stone, so the performance of steel materials Diamond saw blades have a big impact. Due to the better comprehensive performance of 65Mn steel, most manufacturers use it as a saw blade steel body. However, during the heat preservation process, the microstructure of the steel body will change, which will affect its performance. The organization observes and selects representative tissue maps for analysis, for example, each graph is divided into several small maps according to the holding time, and the microstructure of the 65Mn steel body at different times of 3.1 800 insulation is 800 hours. Insulation 丨丨. 丨 丨 丨 , ,, ferrite split curtain uniform, pearlite content increased. At 3min and 60min, the grain boundary is not obvious, ferrite content is more. It is no longer the elongated grain morphology under cold rolling, indicating that the grain of 65Mn steel can recover and recrystallize at 800. During these time periods, the grain size has not changed significantly, indicating this time. The interior of the steel body is mainly grain recovery and C atom diffusion.
3.2 820 insulation 65Mn steel body microstructure at different times 820 especially temperature incubation of 65Mn steel body under different holding time. Different from 800, at 820, the obvious grain boundary can be seen after 30 minutes of heat preservation; the grain growth is obvious when the temperature is kept for 50 minutes.
3.3 840t heat preservation 65Mn steel body microstructure at different times 840T temperature insulation When the 65Mn steel body microstructure under different holding time is seen. It can be seen that the grain growth is not obvious during the period of 40min to 50min, and the grain growth is much larger at 70min, which means that the grain recovery is complete when the holding time is 50min, and the grain is more than 50mm when the temperature is 840t. Start growing up, so the holding time is more suitable at 450min.
3.4 860 tens of heat preservation of the microstructure of the 65Mn steel body microstructure steel body at different times (a), (b). It can be seen that when 860 is kept warm, the grain size is not large when the temperature is kept for 40 minutes, the grain boundary is obvious, the pearlite and ferrite are evenly distributed, and the network cementite begins to appear. Below 40 min is an ideal holding time, and the grain grows much at 60 min.
86(n: The microstructure of the microstructure of the 65Mn 65Mn steel body during the thermal insulation of the 65Mn steel body at different times of 3.5 880. When the fiber is 880T, there is a larger grain size when it is kept for 30 minutes. So here When the temperature is kept at the temperature, the tensile strength test of the sample 4 is tested. After the recrystallization, the K has good performance. According to the microscopic analysis, the 820t:, 840t, 860 is kept for 40min and the 880T is kept for 30min. The sample was stretched.
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