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Iranian Journal of Materials Forming، جلد ۱۲، شماره ۴، صفحات ۲۰-۳۳
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عنوان انگلیسی Hot Deformation Behavior of an API X70 Steel: A Processing Map Approach
چکیده انگلیسی مقاله This study investigates the hot deformation behavior of an API X70 microalloyed steel using a processing map approach. Cylindrical specimens were subjected to compression tests at temperatures ranging from 950 to 1100 °C and strain rates from 0.001 to 1 s⁻¹. Flow curves revealed typical features of work hardening, dynamic recovery, and dynamic recrystallization. Power dissipation efficiency and instability criteria were calculated using a dynamic material model to construct processing maps at various strain levels. The maps identified three optimal hot deformation regions at higher strains, with the most favorable zone (efficiency of 25–33%) located at 1075–1100 °C and 0.001–0.005 s⁻¹. Microstructural validation confirmed these safe zones, while unstable regions were characterized by crack formation and deformation bands. A constitutive analysis yielded an apparent activation energy for hot deformation of 572.5 kJ/mol. The findings provide valuable guidance for optimizing hot working conditions of API X70 steel.
کلیدواژه‌های انگلیسی مقاله API X70 steel,Hot deformation,Processing map,Microstructure
نویسندگان مقاله Fatemeh Ahmadi |
Department of Materials Science and Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran

Mohsen Reihanian |
Department of Materials Science and Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran

Mostafa Eskandari |
Department of Materials Science and Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran

Seyed Reza Alavi Zaree |
Department of Materials Science and Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran

نشانی اینترنتی https://ijmf.shirazu.ac.ir/article_8284_81a4506efb20b0890bddde226c22a4a3.pdf
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