作者：殷尊1, 金敏华2, 张红军1, 王志刚2, 时彪2
作者单位：1. 西安热工研究院有限公司, 陕西 西安 710054;
2. 江苏常熟发电有限公司, 江苏 常熟 215536
关键词：低合金钢;腐蚀坑;超声反射;探头;检测
摘要：
该文通过选用不同频率、不同入射角度的平面透声楔斜探头以及制作的低合金钢板腐蚀坑超声检测专用试块，利用脉冲回波超声检测方法研究低合金钢板背面腐蚀坑的超声波反射特性。研究结果表明：低合金钢板背面腐蚀坑超声检测所用平面透声楔斜探头的最佳频率为5 MHz，最佳入射角度为32°，可以有效检测出的最小缺陷深度为钢板壁厚5%的半球孔（深度0.2 mm）。该研究获得低合金钢板背面腐蚀坑最高的检测灵敏度，同时能够有效发现深度最小的腐蚀坑，可为低合金钢板背面腐蚀坑提供一种有效的检测方法，确保低合金钢板背面的检测质量满足要求。
Ultrasonic reflection characteristics of corrosion pits on back side of low alloy steel plate
YIN Zun1, JIN Minhua2, ZHANG Hongjun1, WANG Zhigang2, SHI Biao2
1. Xi'an Thermal Power Research Institute, Xi'an 710054, China;
2. Jiangsu Changshu Power Plant Co., Ltd., Changshu 215536, China
Abstract: This paper studied the ultrasonic reflection characteristics of the corrosion pits on the back side of low alloy steel plate by pulse echo ultrasonic detection method with different frequencies, different incident angles and ultrasonic test block. The result results showed that 5 MHz was the optimum frequency of the flat-transparent wedge-diameter probe for ultrasonic testing of the corrosion pits on the back side of low alloy steel plate, and 32° was the optimum incident angle. The minimum defect depth that can be effectively detected was a hemispherical hole (depth 0.2 mm) of 5% wall thickness. The study obtained the highest detection sensitivity and effectively detected the smallest defects on the back side of low alloy steel plate. This paper provides a effective testing technique for the corrosion pits on the back side of low alloy steel plate, by which the quality of the inspection of the back side of the low alloy steel plate met the requirements.
Keywords: low alloy steel;corrosion pits;ultrasonic reflection;probe;testing
2019, 45(10):153-158 收稿日期: 2018-11-27;收到修改稿日期: 2019-03-01
基金项目: 中国电力国际有限公司科技项目（CPIH201705）
作者简介: 殷尊(1983-),男,陕西乾县人,高级工程师,硕士,主要从事火力发电机组的金属监督检验、分析与评价方面的研究工作
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