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Interval Island Laser-Scanning Strategy of Ti–6Al–4V Part Additively Manufactured for Anisotropic Stress Reduction

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Abstract

The powder bed fusion (PBF) process using Ti–6Al–4V powder has the specific application in additive manufacturing of a high-performance structural parts in the aerospace and medical industries. The PBF involves the repeated accumulation of laser melted layers. Consequently, high anisotropic residual stresses and local temperature accumulation occur during the rapid melting and cooling in the process. These factors affect the mechanical properties of the as-built structure. In particular, we revealed the effective interval island laser-scanning strategy with less grain size, thermal effect and anisotropic residual stresses of the additively manufactured structure, compared to those of the strip and continuous laser-scanning strategies. Through the cantilever experiment, it was confirmed that the interval island laser-scanning strategy reduced deformation by up to 7.7% compared to that of the conventional strip laser-scanning strategy due to the reduction of anisotropic residual stresses.

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Acknowledgements

This study was supported by the National Research Foundation of Korea(NRF) grant funded by the Ministry of Education (20021996, Development of DfAM-based 3D Printing technology for combustor parts of private sector initiative small space launcher engine (Weight reduction 20%, integration 50%)) and a Korea Institute of Industrial Technology (KITECH) internal project (JE230014, Development of fabrication technology using DfAM for lightweight and parts consolidation of aviation parts) and the National Research Foundation of Korea (NRF) grant funded by the Korea government (No. 2019R1A5A8083201).

Funding

Ministry of Education (Grant number: 20021996, 2019R1A5A8083201), Korea Institute of Industrial Technology (Grant number: JE230014).

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Authors and Affiliations

  1. Korea Additive Manufacturing Innovation Agency (KAMIC), Korea Institute of Industrial Technology (KITECH), 113-58, Seohaean-ro, Siheung-si, Gyeonggi-do, 15014, Republic of Korea

    Jeongho Yang, Dongseok Kang, Si Mo Yeon & Yong Son

  2. School of Mechanical Engineering, Pusan National University, Busan, 46241, Republic of Korea

    Jeongho Yang & Sang Hu Park

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  1. Jeongho Yang
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Contributions

JY: Conceptualization, methodology, visualization, experiments, investigation, formal analysis, software, writing of original draft, review, and editing. DK: Experiments, formal analysis, investigation. SMY: Methodology, investigation, formal analysis. YS: Conceptualization, supervision, funding, project administration, writing of original draft, review, and editing. SHP: Conceptualization, supervision, funding, project administration, writing of original draft, review, and editing.

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Correspondence to Yong Son or Sang Hu Park.

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Yang, J., Kang, D., Yeon, S.M. et al. Interval Island Laser-Scanning Strategy of Ti–6Al–4V Part Additively Manufactured for Anisotropic Stress Reduction. Int. J. Precis. Eng. Manuf. 25, 1087–1099 (2024). https://doi.org/10.1007/s12541-024-00967-z

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