ABSTRACT

High-strength aero-space grade maraging steels finding an increased use in industry for manufacturing of pressure vessels. Structural integrity assessment of such pressure vessels is an important and yet challenging task. Several researchers have attempted to quantify failure or structural integrity of similar pressure vessels using acoustic emission (AE) but a one stop criterion to assess quality of pressure vessels has not been evolved. In this study, an integrated approach in evaluating behaviour of maraging steel specimens has been carried out. AE Behaviour during tensile deformation of maraging steel specimens studied with respect to AE parameters. Two types of specimens viz. type A and type B data are presented in this manuscript. In type A, failure was due to rupture caused by inherent defects and in type B, failure was predominantly due to yielding. Further, an effort was put forth to compare such AE Parameters acquired during qualification burst test of a maraging steel pressure vessel. The pressure vessel that was burst also exhibited type A and type B behaviour at two different zones on the vessel. A reasonable match in the AE behaviour of specimens to that of a pressure vessel has been observed. The promulgated AE criteria have the potential to identify a real-time defect growth during a pressure test.

摘要

高强度航空航天级马氏体时效钢在工业中越来越多地用于制造压力容器。这种压力容器的结构完整性评估是一项重要且具有挑战性的任务。一些研究人员已尝试使用声发射 (AE) 来量化类似压力容器的故障或结构完整性，但尚未发展出用于评估压力容器质量的一站式标准。在这项研究中，已经进行了一种评估马氏体时效钢试样行为的综合方法。根据 AE 参数研究马氏体时效钢试样拉伸变形过程中的 AE 行为。两种类型的标本，即。本手稿中提供了 A 型和 B 型数据。在 A 型中，故障是由于固有缺陷引起的破裂，而在 B 型中，失败主要是由于屈服。此外，还努力比较在马氏体时效钢压力容器的合格爆破试验期间获得的此类 AE 参数。爆裂的压力容器在容器的两个不同区域也表现出 A 型和 B 型行为。已经观察到样品的声发射行为与压力容器的声发射行为合理匹配。颁布的 AE 标准有可能在压力测试期间识别实时缺陷增长。已经观察到样品的声发射行为与压力容器的声发射行为合理匹配。颁布的 AE 标准有可能在压力测试期间识别实时缺陷增长。已经观察到样品的声发射行为与压力容器的声发射行为合理匹配。颁布的 AE 标准有可能在压力测试期间识别实时缺陷增长。