en گروه مکانیکی و شکل دادن Mechanical Performance and Formability of Materials Research Paper Research Paper <div style="text-align: justify;">Dynamic Recrystallization (DRX) is one of the likely mechanisms for fine-graining in metals and alloys. The dynamic recrystallization (DRX) phenomena occurs in different thermo-mechanical processing (TMP) conditions for various metallic materials. DRX depends on various materials and thermo-mechanical parameters such as temperature, strain rate, strain, stress and initial microstructure. in the present study, the restoration mechanism of the 17-7PH stainless steel has been investigated using a hot compression test under different conditions of thermo-mechanical treatment. The microstructural characteristics and the behavior of the hot deformation of the under study steel are investigated using flow curves and microstructure images obtained from optical microscopy. The results show that the maximum and steady state stresses are significantly affected by the strain rate and the deformation temperature. So that, the flow stress increases with decrease in the deformation temperature and increase in the strain rate. Microstructural studies confirm the occurrence of DRX as a restoration mechanism in the microstructure for the two phases of austenite and ferrite.</div> Dynamic Recrystallization, Thermo-mechanical processing, 17-7PH Stainless steel, Compression test. 60 69 http://ijmse.iust.ac.ir/browse.php?a_code=A-10-2015-1&slc_lang=en&sid=1 S. Mortezaei s_mortezaei@metaleng.iust.ac.ir 1800319475328460010601 1800319475328460010601 No Department of Metallurgical Engineering, Iran university of science & technology, Tehran, Iran H. Arabi arabi@iust.ac.ir 1800319475328460010602 1800319475328460010602 Yes Department of Metallurgical Engineering, Iran university of science & technology, Tehran, Iran H. Seyedein seyedein@iust.ac.ir 1800319475328460010603 1800319475328460010603 No Department of Metallurgical Engineering, Iran university of science & technology, Tehran, Iran A. Momeny momeni@hut.ac.ir 1800319475328460010604 1800319475328460010604 No Department of Metallurgical Engineering, Hamedan university of technology, Hamedan, Iran M. Soltanalinezhad M.soltan@aut.ac.ir 1800319475328460010605 1800319475328460010605 No Department of Metallurgical Engineering, Amirkabir university of technology, Tehran, Iran