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Nondestructive evaluation of micro-oxide inclusions in additively manufactured metal parts using nonlinear ultrasonic technique.

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Bibliographic Details
Title: Nondestructive evaluation of micro-oxide inclusions in additively manufactured metal parts using nonlinear ultrasonic technique.
Authors: Park, Seong-Hyun1 (AUTHOR), Eo, Du-Rim2 (AUTHOR), Cho, Jung-Wook3 (AUTHOR), Jhang, Kyung-Young1 (AUTHOR) kyjhang@hanyang.ac.kr
Source: Journal of Materials Processing Technology. Dec2021, Vol. 298, pN.PAG-N.PAG. 1p.
Subjects: Nondestructive testing, Metal inclusions, Ultrasonics, Three-dimensional printing, Tensile tests, Metals, Metallic oxides
Abstract: • Micro-oxide inclusions were evaluated using nonlinear ultrasonic technique (NUT). • Superior evaluation ability was observed compared to conventional methods. • The strengthened mechanical properties by the inclusions were assessed. • NUT has potential for nondestructive online operation during AM processes. Additive manufacturing (AM), commonly known as 3D printing, is an emerging technology for manufacturing metal parts. Recently, micro-oxide inclusions, which are inevitably generated during AM processes owing to the high-temperature environment, have been noted to enhance the mechanical strength of AM metal parts. However, an explicit nondestructive testing (NDT) method to assess the micro-oxide inclusions of AM metal parts has not been reported yet owing to the difficulty of sensing micro-inclusions. In this study, the micro-oxide inclusions of AM metal parts were evaluated nondestructively using a nonlinear ultrasonic technique. The uniqueness and advantages of this study are (1) the development of a micro-oxide inclusion evaluation technique for AM metal parts, (2) superior evaluation ability for micro-inclusions compared to conventional NDT; (3) applicability of the proposed method in assessing the strengthening of the mechanical properties of the AM parts by the inclusions; and (4) potential for nondestructive online monitoring. The performance of the proposed method was validated using specimens fabricated under various 3D printing conditions. The results of the micro-oxide inclusions assessed by the proposed method were consistent with the metallography and tensile testing results. Furthermore, the performance of the proposed method was better than that of conventional NDT. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:• Micro-oxide inclusions were evaluated using nonlinear ultrasonic technique (NUT). • Superior evaluation ability was observed compared to conventional methods. • The strengthened mechanical properties by the inclusions were assessed. • NUT has potential for nondestructive online operation during AM processes. Additive manufacturing (AM), commonly known as 3D printing, is an emerging technology for manufacturing metal parts. Recently, micro-oxide inclusions, which are inevitably generated during AM processes owing to the high-temperature environment, have been noted to enhance the mechanical strength of AM metal parts. However, an explicit nondestructive testing (NDT) method to assess the micro-oxide inclusions of AM metal parts has not been reported yet owing to the difficulty of sensing micro-inclusions. In this study, the micro-oxide inclusions of AM metal parts were evaluated nondestructively using a nonlinear ultrasonic technique. The uniqueness and advantages of this study are (1) the development of a micro-oxide inclusion evaluation technique for AM metal parts, (2) superior evaluation ability for micro-inclusions compared to conventional NDT; (3) applicability of the proposed method in assessing the strengthening of the mechanical properties of the AM parts by the inclusions; and (4) potential for nondestructive online monitoring. The performance of the proposed method was validated using specimens fabricated under various 3D printing conditions. The results of the micro-oxide inclusions assessed by the proposed method were consistent with the metallography and tensile testing results. Furthermore, the performance of the proposed method was better than that of conventional NDT. [ABSTRACT FROM AUTHOR]
ISSN:09240136
DOI:10.1016/j.jmatprotec.2021.117281