Recent progress of external field processing technology in Сhina
Ключевые слова:electromagnetic casting, ultrasonic-electric surface modification, electro-plastic treatment, electro-plastic rolling
АннотацияExternal field processing technology is an advanced forming technology to apply in the liquid forming and solid forming. In this article, the state of the art of external field processing in China is reviewed considering: basic research work regarding the process principle, the resulting work piece deformation, and the energy transfer during the process; application-oriented research work and applications in the field of rolling, cutting and process combinations. To describe the interaction of the multiple physics fields (electromagnetic field, fluid flow, heat transfer and solidification) during the electromagnetic stirring process a comprehensive mathematic model was developed. It is shown that the numerical magnetic flux density and temperature are in good qualitative agreement with the measurements. It is established that due to the electromagnetic force, the molten steel is forced to flow toward the magnetic field traveling direction in the region where the magnetic field imposed. The molten steel flow is decelerated in proportion to the imposed electromagnetic force. In the investigations current frequency effect on the electroplastic rolling (ER) in AZ31 magnesium alloy it is shown that the mechanical properties, microstructure, and texture are highly current frequency-dependent. Best mechanical properties are obtained from 500 Hz ER specimen by carrying out tensile tests for all the rolled strips. Besides, the frequencies of twin boundaries, which are reduced to the minimum at 500 Hz, vary with the current frequency. The effect of electroplastic-differential speed rolling (EDSR) on manufacturing thin AZ31 strip was investigated and it is shown that the ductility of rolled strip is significantly enhanced by EDSR, with an acceptable decrease of tensile strength compared to the strip by ER, which may be attributed to the fully dynamic recrystallization (DRX) and tilted basal poles in the EDSR sample. An ultrasonic-electric surface modification (UESM) treatment, under different vibration frequencies, was employed to improve the surface properties of 2316 stainless steel. A grain refinement layer was formed on the specimen’s surface after UESM treatment.
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