نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه مهندسی مواد و متالوژی، دانشگاه صنعتی همدان، همدان، ایران.
2 پژوهشکده نانو و مواد پیشرفته، پژوهشگاه مواد و انرژی، کرج، ایران
3 عضو هیئت علمی دانشگاه صنعتی همدان
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
In recent years, research activities in the improvement and development of high entropy alloys in non-equiatomic compositional space have been expanded by manipulating deformation mechanisms. In this research, a type of high entropy steel with TWIP behavior has been designed. To further advance production techniques and investigate the hot deformation behavior of this steel, hot compression tests have been carried out in the temperature range of 950-1100˚C and the strain rate of 0.001-1 s-1 to the true strain level of 0.5 The results of the microstructural studies obtained from the hot compression test showed the occurrence of partial recrystallization in most deformation conditions. The appearance of flow curves in the test conditions also confirms the sluggish recrystallization compared to other common austenitic steels. By evaluating the recrystallization mechanisms, it was found that the discontinuous recrystallization mechanism as the dominant mechanism and the continuous recrystallization as the auxiliary mechanism control the microstructural evolutions. Moreover, the higher recrystallized grains fraction by increasing the temperature and strain rate was attributed to more storage energy and rising temperature due to adiabatic heating. Finally, according to the constitutive calculations, the activation energy at the strain of 0.4 for this steel was obtained as 536.1 kJ mol-1.
کلیدواژهها [English]
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