مهندسی متالورژی

مهندسی متالورژی

بررسی رفتار تغییر‌شکل گرم یک فولاد آنتروپی بالای جدید

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
در سال‌های اخیر فعالیت‌های پژوهشی در زمینه بهبود و توسعه آلیاژ‌های آنتروپی بالا (HEAs) در نسبت‌های اتمی نابرابر از طریق دست بردن در مکانیزم‌های تغییر‌شکل آن گسترش یافته است. در این پژوهش نوعی فولاد آنتروپی بالا با رفتار دوقلویی طراحی شده است. سپس به‌منظور توسعه روش‌های تولید و بررسی رفتار تغییر‌شکل گرم این فولاد آزمون‌های فشار گرم در محدوده دمایی˚C 950-1100 و نرخ کرنش‌های s-1001-1/0 تا سطح کرنش حقیقی 5/0 انجام شد. نتایج بررسی‌های ریزساختاری حاصل از آزمون فشار گرم وقوع تبلور‌مجدد جزئی در اغلب شرایط تغییر‌شکل را نشان داد. شکل ظاهری منحنی‌های سیلانی در شرایط آزمایش نیز کند بودن تبلورمجدد را نسبت به سایر فولاد‌های معمول آستنیتی تأیید می‌کند. با ارزیابی مکانیزم‌های تبلور‌مجدد مشخص شد مکانیزم تبلور‌مجدد ناپیوسته به‌عنوان مکانیزم غالب و تبلور مجدد پیوسته به‌عنوان مکانیزم کمکی تحولات ریز‌ساختاری را کنترل می‌کنند. به‌علاوه افزایش کسر دانه‌های تبلور مجدد با افزایش دما و نرخ کرنش به انرژی ذخیره بیشتر و بالا رفتن دما در اثر گرمای آدیاباتیک نسبت داده شد. در نهایت براساس محاسبات بنیادین مقدار انرژی فعالسازی در کرنش 4/0 برای این فولاد kJ mol-1 1/536 به دست آمد.
کلیدواژه‌ها

عنوان مقاله English

An investigation into the hot deformation behavior of a new high entropy steel

نویسندگان English

Haniyeh Moradjoo Hamedani 1
Behzad Tolaminejad 2
Amir Momeni 3
1 Department of Metallurgy and Materials Engineering, Hamedan University of Technology, Hamedan, Iran
2 Department of Nano and Advanced Materials, Materials and Energy Research Center, Karaj, Iran
3 Department of Metallurgy and Materials Engineering, Hamedan University of Technology, Hamedan, Iran
چکیده 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

Hot deformation
Dynamic Recrystallization
High entropy alloy
Constitutive equation
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  • تاریخ دریافت 06 شهریور 1402
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