球墨铸铁QT400-18的石墨球化率对超声声速的影响

详细信息

Effect of Spheroidization Rate of Graphite on the Ultrasonic Velocity of Ductile Cast Iron QT400-18

1. Key Laboratory of Nondestructive Testing of Minsitry of Education, Nanchang Hangkong University, Nanchang 330063, China;
2. Chaoda Valve Group Co., Ltd., Wenzhou 325105, China

摘要: 利用超声水浸C扫描检测方法检测球墨铸铁QT400-18铸件试样的声速，测量了铸件不同部位的硬度，并对该部位进行金相解剖，最后对金相照片进行图像处理，得到试样的石墨球化率。结果表明，该铸件的声速与球化率、硬度与球化率之间皆有较好的相关性。实际生产中可通过硬度测量法对球墨铸铁QT400-18的球化率进行抽检，也可采用超声声速测量法对其进行100%快速检验。
- 球墨铸铁 /
- 球化率 /
- 超声声速 /
- 金相
Abstract: The spheroidization rate affects the properties of ductile cast iron. In this paper, ultrasonic C scanning was used to measure the velocity of ductile cast iron QT400-18 sample, and the rigidity of different parts of the sample was recorded and followed by metallographic testing for these specific positions. Afterwards, the metallographic photos were evaluated to get the spheroidization rate of graphite. The results show that the sound speed and spheroidization rate,rigidity and spheroidization rate of the casting have a good correlation. In actual production, the spheroidization rate of the product can be checked by rigidity measurement on spot, and 100% rapid tests can be carried out by ultrasonic sound velocity measurement method.
- ductile cast iron /
- spheroidization rate /
- ultrasonic velocity /
- metallographic

[1]	雷富军. 球墨铸铁球化及其孕育处理研究进展[J]. 热加工工艺,2008,37(13):125-127,131.
[2]	朱钱兵,张覃轶. 球墨铸铁中球化率和石墨大小的数字评定[J]. 金属加工(热加工),2014(17):89-91.
[3]	张磊. 球铁球化率超声波检测系统的设计与建立[D].哈尔滨:哈尔滨理工大学,2014.