锻造TC4组织超声波调制特性研究

Study on Ultrasonic Modulation Characteristics of Forged TC4 Tissue

采用奥林巴斯A112S10/0.25单晶10 MHz直探头获取TC4合金锻件(锻造温度为920~990℃、锻造变形量22%~48%)组织超声信号,在金相组织分析基础上,用统计学相关性分析金相组织和超声信号特征关系。研究表明在920~970℃温度锻造TC4合金时:超声纵波声速决定于初生α相面积百分比,随面积比提高而提高;超声波纵波衰减决定于初生α相晶粒平均直径,随平均直径增加而增加;超声纵波二次底波频偏决定于初生α相面积百分比,随面积比提高而降低。超声参数决定于(α+β)片层发育程度。

This program mainly focused on the ultrasonic signal analysis of the TC4 alloy forging,using A112 S normal probe of single crystal(10/0.25,10 MHz)that produced by Olympus.Forging temperature of TC4 is between 920~990℃,and forging deformation is in the range of 22%~48%.Based on the analysis of metallographic organization,using the statistical correlation analysis to analyze the relationship between metallographic structure and ultrasonic signal.Research shows that the velocity of ultrasonic longitudinal wave was determined by the percentage of primaryαphase in TC4 when the forging temperature in the range of 920~970℃.And with the area ratio ofαphase increased,the velocity increased.The attenuation of ultrasonic longitudinal wave was determined by the grain average diameter of primaryαphase in TC4 when the forging temperature in the range of 920~970℃.And with the average diameter increased,attenuation increased.The frequency offset of secondary bottom wave was determined by the percentage of primaryαphase in TC4 when the forging temperature in the range of 920~970℃.And with the area ratio ofαphase increased,the frequency offset decreased.When forging in 980℃,the ultrasonic parameters were determined by the degree of development of(α+β)lamellae.