论文部分内容阅读
作者们首次采用受控凝固和受控振动相结合的实验装置和实验方法,在金属凝固过程中引入各种不同形式的振动,抓住凝固固液界面这一中心环节,较为系统地揭示了①纵向稳态正弦振动对固液界面凝固参数的影响;②纵向稳态正弦振动和其他各种振动波形以及横向宽频冲击振动对树枝狀晶固液界面形貌及组织性能的影响;③高能超声参振凝固对细化晶粒及改善第二相形状的影响。实验表明,为了获得最佳的细化晶粒效果,参振频率最好与凝固固液相区的特征共振频率吻合。实验还表明宽频冲击及高能超声参振凝固细化晶粒的效果显著,简单实用,预期有重要的应用前景。
For the first time, the authors used experimental devices and experimental methods combining controlled and controlled vibrations to introduce various forms of vibration in the process of metal solidification and to seize the central part of the solidified solid-liquid interface, which systematically revealed that ① Longitudinal steady-state sinusoidal vibration on the solid-liquid interface solidification parameters; ② Longitudinal steady-state sinusoidal vibration and other vibration waveforms and lateral broadband impact vibration on dendritic solid-liquid interface morphology and microstructure and properties; ③Electroanalysis Effect of Vibration Solidification on Grain Refinement and Shape Improvement of Second Phase. Experiments show that, in order to obtain the best grain refinement effect, the best vibrational frequency of the solidified liquid-solid region coincide with the resonant frequency. Experiments also show that broadband impact and high-energy ultrasonic coagulation grain refinement effect is significant, simple and practical, is expected to have important application prospects.