Hot isothermal plane strain compression (PSC) tests were carried out on a 12Cr-10Ni martensitic precipitation-hardenable (PH) stainless steel, in the temperature range of 750-1050 °C, to study microstructural evolution during large strain deformation. The nature of stress–strain curves varies with Zener–Holloman parameter (Z) with specimens deformed at high Z showing steady-state behavior and those deformed at lower Z showing flow softening. Prior austenite grain size (PAGS), d, exhibited a strong correlation to Z showing a bilinear behavior represented as: d = (1803.9)Z −0.094 for high Z deformation and d = (1456.2)Z −0.058 for low Z deformation. Based on the above study, it is recommended to thermomechanically process 12Cr-10Ni steel at Z ≥ 1022 for obtaining products with good strength–toughness balance.
Journal of Materials Engineering and Performance – Springer Journals
Published: May 30, 2018
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