Derazkola, Hamed AghajaniGarcía Gil, EduardoMurillo Marrodán, AlbertoHardell, Jens2025-07-102025-07-102023-05Derazkola, H. A., Garcia, E., Murillo-Marrodán, A., & Hardell, J. (2023). The effect of temperature and strain rate on the mechanical properties and microstructure of super Cr13 martensitic stainless steel. Journal of Materials Research and Technology, 24, 3464-3476. https://doi.org/10.1016/J.JMRT.2023.04.0122238-785410.1016/J.JMRT.2023.04.012https://hdl.handle.net/20.500.14454/3195In this study, the formability of super Cr13 martensitic stainless steel (MSS) is examined by means of hot tensile tests at different temperatures (900oC–1100 °C) and t strain rates (0.01s−1-10s−1). The potential effect of strain rates and temperatures on the mechanical properties, microstructure and fracture surface of super Cr13 MSS were examined. The post-test analysis, which includes hardness measurements, X-ray diffraction (XRD), fracture analysis by scanning electron microscope (SEM), and Energy-dispersive X-ray spectroscopy (EDS), was carried out. Results show that ultimate tensile stress (UTS) decreases with temperature, this way, the highest UTS was obtained at 900oC-10s−1 (187 MPa), while the lowest UTS (38 MPa) was obtained in the 1100oC-0.01s−1 sample. By contrast the elongation of the material increases with strain rate, since the elongation of the sample at 900oC-10s−1 was near 16% and the elongation of the sample at 1100oC-0.01s−1 was 57%. The XRD and EDS analysis indicated that Cr23C6 and Cr2N are formed inside the microstructure of samples tested between 900 °C and 1000 °C, and these carbides are dissolved above 1000 °C. Temperature affects also retained austenite which increases with temperature. Fractography analysis indicated that the δ-ferrite phase has a primary role in high-temperature rapture. Fracture surface evaluation of samples revealed semi-ductile fracture behaviour below 1000 °C and low strain rates, while ductile fracture was detected on the tensile samples at temperatures higher than 1000 °C and high strain rates. Furthermore, the ductility of super Cr13 MSS was increased by increasing strain rate.eng© 2023 The Author(s)Elevated temperatureFractographyHigh strain rateHot tensile testMicrostructure analysisSuper Cr13journal article2025-07-10