PSI - Issue 77

M. Turhan et al. / Procedia Structural Integrity 77 (2026) 543–549 M.Turhan et al. / Structural Integrity Procedia 00 (2026) 000 – 000

549

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• Vertically printed EOS HX samples had similar high temperature- strength with conventional HX samples, which is characteristic of Hastelloy X material having high temperature strength. • There was no remarkable change in oxidation of the test coupons during the supercritical water exposure test. • Default support parameters were not enough to maintain the printability which led to more conservative support structures with different process parameters. That’s why heat exchanger unit was printed by more solid support to lead heat dissipation to the platform and avoid deformation and residual stress. • The investigation showed that block supports were not stable and the Hastelloy HX material has very severe residual stresses. That’s why further research may be on residual stress and support structures (especially block support). Acknowledgement This work is co-financed from the state budget by Technology Agency of the Czech Republic under the Velemlok THÉTA Programme. 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