In-situ electron beam characterization for electron beam powder bed fusion

IF 10.3 1区工程技术 Q1 ENGINEERING, MANUFACTURING

Additive manufacturing Pub Date : 2024-09-25 DOI:10.1016/j.addma.2024.104567

Matthias Markl, Mohammad Reza Azadi Tinat, Timo Berger, Yannic Westrich, Jakob Renner, Carolin Körner

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Abstract

Electron beam powder bed fusion is an advanced additive manufacturing technology that utilizes an electron beam to fabricate complex metallic components layer by layer. It is well known, that the beam profile is one of the most important key ingredients for successful processing. Surprisingly, the beam profile during the process is almost unknown until today. The state of the art in beam characterization comprises pre-processes applying different beam measurement devices which ensure a beam profile evaluation at one or a small number of fixed locations on the build area. To the knowledge of the author, there exist no technique to measure the beam profile in-situ during manufacturing at arbitrary locations on the build area.

This study presents a groundbreaking method for an in-situ measurement technique of the beam profile for electron beam powder bed fusion. The method exploits electron optical images of a sintered powder bed after preheating. After converting the image into the frequency space by a Fourier transformation, the beam profile is reconstructed. In this work we demonstrate the feasibility on a focused electron beam with an elliptical Gaussian intensity distribution. This real-time assessment capability, completed within seconds, marks a significant advancement in the field of electron beam powder bed fusion, promising to improve manufacturing outcomes through enhanced process optimization and beam profile monitoring.

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来源期刊

Additive manufacturing Materials Science-General Materials Science

CiteScore

19.80

自引率

12.70%

发文量

648

审稿时长

35 days

期刊介绍： Additive Manufacturing stands as a peer-reviewed journal dedicated to delivering high-quality research papers and reviews in the field of additive manufacturing, serving both academia and industry leaders. The journal's objective is to recognize the innovative essence of additive manufacturing and its diverse applications, providing a comprehensive overview of current developments and future prospects. The transformative potential of additive manufacturing technologies in product design and manufacturing is poised to disrupt traditional approaches. In response to this paradigm shift, a distinctive and comprehensive publication outlet was essential. Additive Manufacturing fulfills this need, offering a platform for engineers, materials scientists, and practitioners across academia and various industries to document and share innovations in these evolving technologies.