求材料的翻译
来源:百度知道 编辑:UC知道 时间:2024/05/15 11:32:24
而超声场与磁场对金属熔体的作用具有相同的地方,如产生熔体的强迫对流、热效应等,但是产生的机理不同,前者产生的波动是由于超声波音响流造成的,后者是电磁力将金属径向方向压向或拉离轴心而产生强制对流而引起的,所以,很容易联想到将这两种物理场复合起来处理金属熔体。如果能够获得使超声能与电磁能在熔体内有效复合的最佳工艺参数,就可以得到组织更加细小的组织结构。
研究结果表明:经电磁搅拌处理的Al-Si合金,其凝固组织得到细化,在高压旋转磁场的作用下使得硅从晶界中析出造成严重偏析;而低压情况下这种现象得到较好改善;超声处理时间存在最佳值,并不是处理时间越长细化效果越明显;经超声及电磁同时作用于金属熔体,除可以使凝固晶粒更加圆整外,并不能较大提高细化程度。
Along with the scientific technological advance as well as the people environmental consciousness's enhancement, the non-pollution's physical fine crystal technology obtains the extensive research, mainly includes the machinery and the electromagnetism agitation, the electricity pulse, the ultrasonic vibration and so on, ultrasonic vibration's method also has the deaeration besides the refined grain, improvement segregation, isotropic and so on effects. Therefore, the metal supersonic coagulation technology has obtained researcher's attention since the 1920s. Countries and so on Russia, Japan, US successively have carried out the related research, studies the content induces mainly includes: Ultrasonic wave to metallic material performance improvement; The ultrasonic wave law prepares half solid state pulp and the metal-based compound materials; Supersonic in aspect and so on continuous casting, welding, heat treatment applied technologies. but the ultra sound field