摘要
介绍欧美国家用相控阵超声(PAUT)对应力腐蚀裂纹进行检测和定量的案例。检测和定量的应力腐蚀裂纹,高为3mm～15mm,存在于下列工件中:壁厚9mm的焊缝、螺栓(裂纹深度位置分别为22mm和59mm)、汽轮机叶片根部、转子轮缘叶根槽。另外,也应用于应力氢致裂纹的检测,对其作了测高评定。还与断口试验结果作了对比。PAUT对裂纹的测高精确度,能控制在±1mm,有测定值偏小的倾向。最后,提出有关优化测量应力腐蚀裂纹端部分支状态的PAUT参数的建议。介绍国外PAUT应用案例的目的,为国内特别是承压设备行业如何参照ASME法规最新版(2011a)积极推广应用PAUT提供有用借鉴。
The paper presents case studies related to stress corrosion cracks （SCC） detected and sized by Phased Array Ultrasonic Technology （PAUT）. SCC with height between 3 mm to 15 mm were detected and sized in the following components： welds with thickness of 9 mm, bolts at depth 22mm and 59mm, blade roots, rotor steeple hook. A stress oriented hydrogen--induced crack is also displayed and height e- valuation is estimated. Comparison with fracture mechanics, grinding measurement and optical is also presented. PAUT is capable to size cracks within ~ 1 mm, with an under sizing trend. Technical recom- mendations are also made for optimizing the PAUT parameters in sizing the last significant tip （branch） of SCC. The intention of introducing these cases related to PAUT is to provide a useful reference to promoting further the use of PAUT at home, especially in the pressure equipment industry in accordance with the re- quirements of the recent ASME Code （2011a）.
出处
《无损探伤》
2012年第5期1-4,7,共5页
Nondestructive Testing Technology
