| Cr-Mo钢平均晶粒尺寸的超声无损评价 |
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| 引用本文： | 张洪达,马世伟.Cr-Mo钢平均晶粒尺寸的超声无损评价[J].上海大学学报(自然科学版),2006,12(2):162-165. |
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| 作者姓名： | 张洪达 马世伟 |
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| 作者单位： | 上海大学 机电工程与自动化学院，上海市电站自动化技术重点实验室， 上海 200072 |
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| 基金项目： | 上海市自然科学基金;上海市教育发展基金 |
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| 摘 要： | 对经过高温热处理的Cr Mo钢模拟试样进行了高频超声测试，对获得的底面反射波信号进行了时域分析和基于傅里叶变换的频域分析，得到了相应的超声波衰减系数、速度、底面反射波频率的变化，并建立了它们与试样平均晶粒尺寸之间的关系，对利用超声脉冲反射技术进行材料热疲劳损伤进展的早期评价具有实际意义.
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| 关 键 词： | 超声无损评价 晶粒尺寸 频率 衰减系数 速度 |
| 文章编号： | 1007-2861（2006）02-0162-04 |
| 收稿时间： | 2005-04-20 |
| 修稿时间： | 2005年4月20日 |
Ultrasonic Nondestructive Evaluation of Average Grain Size of Cr-Mo Steel |
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| ZHANG Hong-da,MA Shi-wei.Ultrasonic Nondestructive Evaluation of Average Grain Size of Cr-Mo Steel[J].Journal of Shanghai University(Natural Science),2006,12(2):162-165. |
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| Authors: | ZHANG Hong-da MA Shi-wei |
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| Institution: | School of Mechatronical Engineering and Automation, Shanghai Key Laboratory of Power -Station Automation Technology, Shanghai University, Shanghai 200072, China |
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| Abstract: | This paper describes a high frequency ultrasonic testing of Cr-Mo steel samples heat-treated at high temperature.Reflected echoes were analyzed both in the time and frequency domains.Ultrasonic characteristics such as attenuation coefficient,velocity and frequency of samples being tested were obtained.Relationships between these parameters and the average grain diameter of samples were also obtained.These results are useful in early assessment of material thermal fatigue development based on ultrasonic pulse-echo techniques. |
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| Keywords: | ultrasonic nondestructive evaluation attenuation coefficient velocity frequency grain diameter |
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