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Laser ultrasonic testing for near-surface defects inspection of 316L stainless steel fabricated by laser powder bed fusion

China foundry, 2021-07, Vol.18 (4), p.360-368 [Peer Reviewed Journal]

Foundry Journal Agency and Springer Singapore 2021 ;COPYRIGHT 2021 Foundry Journal Agency ;Copyright © Wanfang Data Co. Ltd. All Rights Reserved. ;ISSN: 1672-6421 ;EISSN: 2365-9459 ;DOI: 10.1007/s41230-021-1063-1

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  • Title:
    Laser ultrasonic testing for near-surface defects inspection of 316L stainless steel fabricated by laser powder bed fusion
  • Author: Dai, Ting ; Jia, Xiao-jian ; Zhang, Jun ; Wu, Jin-feng ; Sun, Yi-wei ; Yuan, Shu-xian ; Ma, Guan-bing ; Xiong, Xiao-jing ; Ding, Hui
  • Subjects: 3D printing ; CT imaging ; Engineering ; Machines ; Manufacturing ; Materials Engineering ; Metallic Materials ; Powders ; Processes ; Research & Development ; Steel, Stainless
  • Is Part Of: China foundry, 2021-07, Vol.18 (4), p.360-368
  • Description: The laser powder bed fusion (L-PBF) method of additive manufacturing (AM) is increasingly used in various industrial manufacturing fields due to its high material utilization and design freedom of parts. However, the parts produced by L-PBF usually contain such defects as crack and porosity because of the technological characteristics of L-PBF, which affect the quality of the product. Laser ultrasonic testing (LUT) is a potential technology for on-line testing of the L-PBF process. It is a non-contact and non-destructive approach based on signals from abundant waveforms with a wide frequency-band. In this study, a method of LUT for on-line inspection of L-PBF process was proposed, and a system of LUT was established approaching the actual environment of on-line detection to evaluate the method applicability for defects detection of L-PBF parts. The detection results of near-surface defects in L-PBF 316L stainless steel parts show that the crack-type defects with a sub-millimeter level within 0.5 mm depth can be identified, and accordingly, the positions and dimensions information can be acquired. The results were verified by X-ray computed tomography, which indicates that the present method exhibits great potential for on-line inspection of AM processes.
  • Publisher: Singapore: Springer Singapore
  • Language: English
  • Identifier: ISSN: 1672-6421
    EISSN: 2365-9459
    DOI: 10.1007/s41230-021-1063-1
  • Source: DOAJ Directory of Open Access Journals
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