Abstract
IN738C is a widely utilized precipitation hardening nickel-based superalloy known for its excellent mechanical properties in various industries. Laser powder bed fusion (LPBF) has emerged as a highly advantageous additive manufacturing process for fabricating complex-shaped parts using metal powders. This study investigates the influence of process parameters, specifically the scanning speed and hatch spacing, on the defect formation in LPBF-manufactured IN738C alloy. Additionally, the microstructure of heat-treated IN738C samples is examined, and their mechanical properties are evaluated through ambient tensile testing. The results indicate that LPBF-produced IN738C alloy exhibits the highest density when using a hatch spacing of 90 μm and a scanning speed of 750 mm/s. Upon heat treatment, cracks within the material propagated. Microscopic analysis of the heat-treated specimens reveals the presence of precipitated carbides and the 03B3′ phase, with continuous carbides observed along the grain boundaries. The as-built (AB) specimens exhibit a medium result in ultimate tensile strength (UTS), yield strength (YS), and elongation. However, the heat-treated (HT) specimens fail prior to yielding, exhibiting a lower result in UTS and elongation than AB specimens.
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© 2024 The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.
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Zhang, H., Han, Q., Liu, Z., Zhang, Z., Sui, Z., Wang, L. (2024). Microstructure and Mechanical Properties of IN738C Superalloy Fabricated by Laser Powder Bed Fusion. In: Scholz, S.G., Howlett, R.J., Setchi, R. (eds) Sustainable Design and Manufacturing 2023. SDM 2023. Smart Innovation, Systems and Technologies, vol 377. Springer, Singapore. https://doi.org/10.1007/978-981-99-8159-5_18
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DOI: https://doi.org/10.1007/978-981-99-8159-5_18
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