摘要
球墨铸铁的球化率与超声波纵波在其内部传播速度的大小存在着一定的对应关系,根据上述原理,利用压电晶片、任意波形信号发生器、数字示波器、计算机等构建了球墨铸铁球化率超声波检测系统,并采用Lab VIEW编写了相应的软件程序,实现被测球铁件长度和超声波传播速度的自动计算。通过与金相观察法球化率检测结果比对的方法,建立了超声波传播速度和球化率间的具体关系表,并证实了声速与球化率间确实存在很好的相关性。试验结果表明,利用建立的关系,可以通过该系统测得超声波声速,并据此快速求得球铁件的球化率,且准确率大于95%,具有很好的重复性。
There is a certain relation between the spheroidization rate of ductile iron and the propagation velocity of ultrasonic longitudinal wave. According to this, an ultrasonic wave system for testing the spheroidization rate was constructed by using the piezoelectric wafer, arbitrary waveform signal generator, digital oscilloscope and computer and so on. And the software programs were written by LabVIEW, in order to realize the automatic calculation of the cast iron sample length and propagation velocity. By comparing with the metallographic observation method, a specific relation between the propagation velocity and spheroidization rate was got, and the correlation between them is very good. The experimental results show that the spheroidization rate of ductile iron can be quickly given according to the measured propagation velocity via the specific relation, and the accuracy is more than 95%, and it has the very good repeatability.
出处
《铸造》
CAS
CSCD
北大核心
2015年第4期321-324,共4页
Foundry
基金
国家大学生创新性试验项目(201310214005)
黑龙江省教育厅科研项目(12541107)
关键词
超声检测
球墨铸铁
球化率
金相观察
ultrasonic test
ductile iron
spheroidization rate
metallographic observation
