大型铸造不锈钢机匣超声相控阵检测及定量方法研究  

Research on Ultrasonic Phased Array Detection and Quantitative Method for Large Cast Stainless Steel Casing

作　　者：黄鑫章 李喆 李义军 陈振华[1] 赵玉琦 卢超[1] HUANG Xinzhang;LI Zhe;LI Yijun;CHEN Zhenhua;ZHAO Yuqi;LU Chao(Key Laboratory of Nondestructive Testing of Ministry of Education,Nanchang Hangkong University,Nanchang 330063,China;AECC Shenyang Liming Aero-Engine Co.,Ltd.,Shenyang 110043,China;Guizhou Anji Aviation Precision Casting Co.,Ltd.,Anshun 561000,China)

机构地区：[1]南昌航空大学无损检测技术教育部重点实验室,南昌330063 [2]中国航发沈阳黎明航空发动机有限责任公司,沈阳110043 [3]贵州安吉航空精密铸造有限责任公司,贵州安顺561000

出　　处：《无损探伤》2024年第4期6-11,共6页Nondestructive Testing Technology

基　　金：国家科技重大专项(J2019-Ⅶ-0002-0142)经费资助。

摘　　要：大型燃气轮发动机不锈钢机匣尺寸大、铸造工艺复杂,在铸造过程中易产生微裂纹、气孔、夹杂等缺陷。由于机匣厚度较大,射线检测技术难以对大壁厚机匣进行穿透检测。由此,提出大型不锈钢机匣内部缺陷的超声相控阵检测技术,分析大厚度机匣分区检测的必要性及各分区所用超声相控阵换能器的优选方案,并提出采用-6dB法对缺陷进行定量检测。结果表明:超声相控阵检测技术能够有效检测大型不锈钢机匣的内部缺陷,检测灵敏度在60mm厚度范围内不低于φ3mm平底孔当量尺寸,-6dB法测量远近表面缺陷尺寸的相对误差分别低于26.7%和16.7%,可用于大型不锈钢机匣的定量无损检测。Large gas turbine stainless steel casings have large dimensions and complex casting processes,which are prone to defects such as microcracks,air holes,and inclusions during the casting process.Due to the large thickness of the casting,conventional radiographic testing techniques are difficult to penetrate and inspect the large wall thickness casting.Therefore,the ultrasonic phased array testing technology for internal defects in large stainless steel castings is proposed.The necessity of partitioned testing for thick castings and the optimal selection of ultrasonic phased array transducers for each partition are analyzed,and then the use of the-6dB method for quantitative defect detection is proposed.The results show that the ultrasonic phased array testing technology can effectively detect internal defects in large stainless steel castings,in which the detection sensitivity is not less than φ3mm flat-bottom hole equivalent size within a thickness of 60mm.The relative errors of the-6dB method in measuring the sizes of far and near surface defects are respective less than 26.7% and 16.7%,indicating its suitability for quantitative non-destructive testing of large thickness stainless steel castings.

关 键 词：不锈钢机匣 超声相控阵 定量检测 -6dB定量法 

分 类 号：TG115.28[金属学及工艺—物理冶金]