PSI - Issue 80

Vaclav Sklenicka et al. / Procedia Structural Integrity 80 (2026) 493–500 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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software (Oxford Instruments, High Wycombe, United Kingdom). The dislocation substructure was investigated using a JEOL 2100F transmission electron microscope operating at 200 kV. Small discs were punched from creep specimens and ground to a thickness of about 0.1 mm. The discs were further thinned by a double-jet Struers Tenupol electrolytic polishing machine, using an electrolyte consisting of 5% perchloric acid and 95% acetic acid. Details of the metallographic and fractographic methods used here can be found in our earlier papers (Sklenicka et al. (2021(a), (b), 2023, 2024)). 3. Results 3.1. Creep behavior

Fig. 1. Selected standard creep curves of Zry- 4 under constant stress and temperature: (a) and (b) fractured creep specimens at 350°C and different tensile stresses σ , (c) long-term interrupted creep test exposure at 50 0°C and 60 MPa, (d) interrupted tests at different testing temperatures and 200 MPa.