Hot isostatic pressing of IN718 components manufactured by selective laser melting

By W. Tillmann, C. Schaak, J. Nellesen, M. Schaper, M. E. Aydinöz, K. Hoyer. 2017

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X-Ray Microcomputed Tomography in Additive Manufacturing: A Review of the Current Technology and Applications (2018, neutral): “46 Rapid melting/cooling during LPBF results in such trapped gas pores having no time to outgas and therefore remaining in the part.”
Effects of Selective Laser Melting additive manufacturing parameters of Inconel 718 on porosity, microstructure and mechanical properties (2018, background): “However, Tillmann et al. [18] observe that HIP also modi ﬁ es the microstructure of SLM Inconel 718: the microstructure no longer resembles the typical microstructure obtained by SLM, the grains are bigger, and they no longer have an orientation along the build axis.”
Metallurgy, mechanistic models and machine learning in metal printing (2020, methodology): “Post processing using hot isostatic pressing may be performed to minimize porosity and improve fatigue strength 1,102–104 .”
Laser powder bed fusion of Hastelloy X: Effects of hot isostatic pressing and the hot cracking mechanism (2018, result): “This finding shows agreement with the literature [22], in which the additive-manufactured Inconel 718 was postprocessed by HIP processing.”