低合金钢板背面腐蚀坑的超声波反射特性  

Ultrasonic reflection characteristics of corrosion pits on back side of low alloy steel plate

作　　者：殷尊[1] 金敏华 张红军[1] 王志刚[2] 时彪[2] YIN Zun;JIN Minhua;ZHANG Hongjun;WANG Zhigang;SHI Biao(Xi’an Thermal Power Research Institute,Xi’an 710054,China;Jiangsu Changshu Power Plant Co.,Ltd.,Changshu 215536,China)

机构地区：[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

出　　处：《中国测试》2019年第10期153-158,共6页China Measurement & Test

基　　金：中国电力国际有限公司科技项目(CPIH201705)

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。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 flattransparent 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.

关 键 词：低合金钢 腐蚀坑 超声反射 探头 检测 

分 类 号：TB553[理学—物理]