摘要
介绍了超声波检测球化率的基本原理以及超声波声速与石墨形态关系,分析出球墨铸铁声速的影响因素是球化率、石墨大小和基体组织,通过数据统计以及回归分析得出球化等级与声速之间的关系：1级声速5 680-5 820 m/s、2级声速5 620-5 680 m/s、3级声速5 560-5 620 m/s、4级声速5 500-5 560 m/s、5级声速5 440-5 500 m/s、6级声速小于5 440 m/s。在不同时间分别对其中15个铸件进行了3次检测,结果显示,声速法测定球化率与金相法测定的球化率相吻合。
The basic principle of using ultrasonic method to test the nodularity of nodular cast iron and the relationship between the ultrasonic velocity and graphite morphology was introduced. It was showed by analysis that the nodularity, graphite size and matrix structure were the factors influencing the sound velocity of the nodular iron. The relationship between nodularity grade and the sound velocity was found by data statistics and regression analysis as follows：the sound velocity of grade 1 was of 5 680- 5 820 m/s,the sound velocity of grade 2 was of 5 620-5 680 m/s,the sound velocity of grade 3 was of 5 560-5 620 m/s,the sound velocity of grade 4 was of 5 500-5 560 m/s,the sound velocity of grade 5 was of 5 440-5 500 m/s,the sound velocity of grade 6 was less than 5 440 m/s. 15 castings had been test repeatedly three times at different time,the results indicated that the nodularity obtained by ultrasonic method were the same as that obtained by microstructure test method.
出处
《现代铸铁》
CAS
2014年第4期28-31,共4页
Modern Cast Iron
关键词
球墨铸铁
球化率
超声波
声速
nodular cast iron
nodularity
ultrasonic
sound velocity
