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Hot Deformation Behavior of an API X70 Steel: A Processing Map Approach | ||
| Iranian Journal of Materials Forming | ||
| دوره 12، شماره 4، 2025، صفحه 20-33 اصل مقاله (1.58 M) | ||
| نوع مقاله: Research Paper | ||
| شناسه دیجیتال (DOI): 10.22099/ijmf.2025.53864.1341 | ||
| نویسندگان | ||
| Fatemeh Ahmadi؛ Mohsen Reihanian؛ Mostafa Eskandari* ؛ Seyed Reza Alavi Zaree | ||
| Department of Materials Science and Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran | ||
| چکیده | ||
| 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. | ||
| کلیدواژهها | ||
| API X70 steel؛ Hot deformation؛ Processing map؛ Microstructure | ||
| مراجع | ||
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