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acoustic emission monitoring and Microscopic Investigation of Cracks in ERCuNi Cladding

Journal of Materials Science & Technology 2003年第3期19卷 201-205页

作者： S.P.Lu O.Y.Kwon K.J.Lee T.B.Kim Department of Mechanical Engineering Inha University253 Yonghyun-dongInchon 402-751KoreaDepartment of Mechanical EngineeringInha University253 Yonghyun-dongInchon 402-751KoreaDepartment of Mechanical EngineeringInha University253 Yonghyun-dongInchon 402-751KoreaDepartment of Mechanical EngineeringInha University253 Yonghyun-dongInchon 402-751Korea

A corrosion resistant CuNi cladding was deposited on SM45C (equivalent to AISI1045) substrate by DC inverse arc welding. During the welding process, a three channel acoustic emission (AE) monitoring system was applied to detect the crack signals generating from both the cladding process and after cladding. Characteristics of the welding crack signal and noise signal had been analyzed systematically. Based on the record time of the signal, the solidification crack and delayed crack were distinguished. By two-dimensional AE source location, the crack position was located, and then investigated by scanning electron microscopy (SEM). Results showed that the AE system could detect the welding crack with high sensitivity and the two-dimensional source location could accurately determine the crack position. Microstructures of the cladding and heat affected zone (HAZ) were examined. Dendrites in the cladding and coarse grains in the HAZ were found.

关键词： Cladding acoustic emission monitoring Crack CuNi alloy

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Study on acoustic emission Characteristics of Deformation Damage Process of Zirconia Ceramics

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Journal of Materials Science and Chemical Engineering 2024年第2期12卷 61-72页

作者： Qingchuan Fu Yushu Lai School of Electronic Information and Engineering Chongqing Three Gorges University Chongqing China Key Laboratory of Signal and Information Processing School of Electronic and Information Engineering Chongqing Three Gorges University Chongqing China

Zirconia ceramics have become increasingly widely used in recent years and are favored by relevant enterprises. From the traditional dental field to aerospace, parts manufacturing has been used, but there is limited research on the deformation and damage process of zirconia ceramics. This article analyzes the acoustic emission characteristics of each stage of ceramic damage from the perspective of acoustic emission, and explores its deformation process characteristics from multiple perspectives such as time domain, frequency, and EWT modal analysis. It is concluded that zirconia ceramics exhibit higher brittleness and acoustic emission strength than alumina ceramics, and when approaching the fracture, it tends to generate lower frequency acoustic emission signals.

关键词： Zirconia Ceramics acoustic emission monitoring Crack Damage

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