PSI - Issue 80

Marie Kvapilová et al. / Procedia Structural Integrity 80 (2026) 269–278 Author name / Structural Integrity Procedia 00 (2019) 000–000

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Fig. 5. Stress dependence of time to fracture for temperature 700°C, 800°C and 900°C.

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Fig. 6. Stress dependance of fracture elongation for temperature 700°C, 800°C and 900°C.

3.2. Microstructure investigation The microstructure produced by the Laser Powder Bed Fusion (L-PBF) process was studied in an article focused on the fatigue behaviour of INC 939 (Babinský et al., 2025), carried out within the same project that supports the research on the creep behaviour of this material. The Babinský at al. demonstrated that microstructure exhibits grains with an average grain size of about 20 µ m, predominantly elongated along the build direction. Experimental observations indicate that the grain size in the L-PBF state is significantly finer than in the cast condition, accompanied by substantial variability in grain dimensions. Additionally, a notable fraction of relatively small grains is present,