四、超声波在冶金及热处理中的应用超声波在冶金及热处理方面的应用最早,始于1930年,早期的工作主要是针对低熔点有色金属及其合金的熔化铸造进行了研究,最近几年来由于超声技术的进展对于钢锭结构,化学热处理,时效硬化,相变,提高淬火冷却能力等方面进行了广泛的研究,到目前为止各方面的研究还不够系统和全面。由于所采用的频率功率及 Fourth, the application of ultrasound in metallurgy and heat treatment Ultrasound in the metallurgical and heat treatment of the earliest applications, beginning in 1930, the early work is mainly for low melting point non-ferrous metals and their alloys melt casting was studied in recent years due to ultrasound The progress of technology for the ingot structure, chemical heat treatment, aging hardening, phase transformation, to improve the ability of quenching and cooling conducted extensive research, so far all aspects of research is not systematic and comprehensive. Due to the frequency of power used and