TC4合金激光立体成形孔洞类缺陷的超声检测  

Ultrasonic Nondestructive Testing of Hole Type Defects in Laser Solid Forming TC4 Alloy

作　　者：阮雪茜 林鑫[1] 黄春平[3] 黄卫东[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072 [2]中航商用航空发动机有限责任公司,上海200241 [3]南昌航空大学轻合金加工科学与技术国防重点学科实验室,江西南昌330063

出　　处：《中国激光》2015年第12期64-71,共8页Chinese Journal of Lasers

基　　金：国家863计划(2013AA031103);国家自然科学基金(51323008;51105311;51271213);国家973计划(2011CB610402);高等学校博士学科点专项科研基金项(20116102110016)

摘　　要：以TC4钛合金激光立体成形件为研究对象,探讨其内部、表面及近表面孔洞类缺陷与超声波的相互作用关系。研究结果表明,在相同检测条件下,对于TC4钛合金激光立体成形件中同深度不同孔径的长横孔缺陷,超声反射波幅值随长横孔直径的增加而增加;对于成形件中同孔径不同深度的长横孔缺陷,超声反射波幅值随长横孔所在深度增加而减小;利用5PФ8纵波直探头,能发现激光立体成形TC4钛合金中0.6 mm大小的孔洞类缺陷;超声表面波沿深度方向发现TC4钛合金激光立体成形件中槽型和孔型缺陷的能力均小于4 mm,且孔型缺陷比槽型缺陷更难发现。The interaction between the inner, surface and near-surface defects of laser solid forming TC4 alloy and ultrasonic are studied. The results show that under the same testing conditions, reflection amplitude value increases with the increasing of long lateral hole diameter for the long lateral hole defects with the same depth and different diameters; and the reflection amplitude value decreases with the increasing of the depth of long lateral hole for the long lateral hole defects with the same diameter and different depths; holes within 0.6 mm diameter can be found in laser solid forming TC4 alloy using 5Pφ8 straight longitudinal wave probe. The ability of SAW to found defects less than 4mm from the surface in the depth direction is less than 4 mm and the hole defect is harder to find than the groove.

关 键 词：激光技术 激光立体成形 TC4钛合金 超声波 表面波 

分 类 号：TG115.28[金属学及工艺—物理冶金]