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Effect of Preheating Temperature on Microstructural and Mechanical Properties of Inconel 718 Fabricated by Selective Laser Melting

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Abstract

Various studies related to additive manufacturing (AM) have been conducted with Ni-based superalloy and multiscale investigations of widely used Inconel 718 superalloy have been actively performed with the selective laser melting (SLM) method. The formation of defects and thermal residual stress during the SLM process could particularly affect product quality and life-time. Thus, to optimize the SLM process condition for Inconel 718 boasting the minimum of deteriorating properties, the microstructural study was conducted with various energy densities and preheating temperatures. The SLM process condition over 99.9% of density was established and the change of microstructural and mechanical characteristics were confirmed according to the preheating temperature from 50 to 150 °C. The fraction of the low angle grain boundary (LAGB) and the stored strain energy per unit volume gradually decreased as the preheating temperature increased. In particular, while maintaining the mechanical properties, the thermal residual stress in the direction perpendicular to the building direction decreased under the half value of yield strength which could induce deformation.

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Acknowledgements

 This work was partly supported by Korea Institute of Industrial Technology as “Development of in-situ thermal residual stress reduction system and technology for metal additive manufacturing (KITECH EO-20-0001). and Korea Evaluation Institute of Industrial Technology(KEIT) grant funded by the Korea government(MOTIE) (No.20011298, Development of superalloy powder and parts manufacturing technology for additive manufacturing).

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  1. Won Rae Kim and Hyung Giun Kim equally contributed to this work.

Authors and Affiliations

  1. Functional Materials and Components R&D Group, Korea Institute of Industrial Technology, Gangneung, 25440, Republic of Korea

    Jung-Hyun Park, Gyung Bae Bang, Yeong Hwan Song, Byoung-Soo Lee, Won Rae Kim & Hyung Giun Kim

  2. Department of Materials Science and Engineering, Inha University, Incheon, 22212, Republic of Korea

    Jung-Hyun Park, Gyung Bae Bang & Kee-Ahn Lee

  3. Intelligent Manufacturing R&D Department, Korea Institute of Industrial Technology, Siheung, 15014, Republic of Korea

    Yong Son

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Park, JH., Bang, G.B., Lee, KA. et al. Effect of Preheating Temperature on Microstructural and Mechanical Properties of Inconel 718 Fabricated by Selective Laser Melting. Met. Mater. Int. 28, 2836–2848 (2022). https://doi.org/10.1007/s12540-022-01169-w

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