50W800 Silicon steel, as the main iron core material of the motor, is required to have excellent magnetic properties such as low iron loss and high magnetic inductance. In recent years, with the rapid development of high-speed motors and micro-motors, motors are developing in the direction of high-speed, miniaturization and high-efficiency. This requires that the 50W800 Silicon steel sheet not only has high magnetic induction and low iron loss, but also has high strength.
At present, the strengthening methods used in 50W800 Silicon steel mainly include solid solution strengthening, grain refinement strengthening, dislocation strengthening and precipitation strengthening. However, in the process of grain refinement strengthening, the grains are not sufficiently grown, and the iron loss is generally higher in this case.
The dislocation strengthening process requires the use of incomplete recrystallization, which will inevitably lead to a higher iron loss value. Therefore, in order to improve the strength of 50W800 Silicon steel on the premise of ensuring low iron loss and high magnetic induction, it is necessary to pay more attention to the solid solution strengthening and precipitation strengthening of 50W800 Silicon steel.
The main elements for solid solution strengthening of 50W800 Silicon steel are Si, P, Mn, Ni, and sometimes Cr, Mo, Cu, Ti and other elements are added.
However, most of the solid solution strengthening elements have a limited increase in strength, and elements such as P, which have good solid solution strengthening effect, are easy to segregate at the grain boundaries and cause brittle cracks in 50W800 Silicon steel. Therefore, it is difficult to significantly improve the strength of 50W800 Silicon steel without reducing its magnetic properties, plasticity and other performance indicators by using the solid solution strengthening method.
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