تعیین پنجره عملیات حرارتی کوئنچ میانی برای یک فولاد دوفازی کربن- منگنزدار بر اساس رفتار بازگشت، آنیل میان‌بحرانی و آنیل فرابحرانی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی مواد، دانشگاه صنعتی سهند، تبریز، ایران

2 دانشکده مهندسی مواد، دانشگاه صنعتی اصفهان، اصفهان، ایران

چکیده

ریزساختار اولیه مارتنزیتی در فرآوری فولادهای دوفازی به علت منابع جوانه‌زنی زیاد آستنیت و توزیع رشته‌ای آن مورد توجه قرار گرفته است. در پژوهش حاضر، تحولات ریزساختاری حین عملیات کوئنچ میانی روی یک فولاد کربن-منگنزدار در سه محدوده دمایی فرابحرانی (Ac₃<T)، میان‌بحرانی (Ac₁<T<Ac₃) و زیربحرانی (T<Ac₁) توسط میکروسکوپ نوری، الکترونی روبشی و پراش پرتو ایکس مورد مطالعه قرار گرفته است. با توجه به نتایج سختی‌سنجی مشخص شد فرآیند بازگشت در محدوده دمایی زیربحرانی دارای دومرحله با سرعت‌های متفاوت است؛ مرحله اول با خروج کربن از ساختار و ایجاد کاربیدهایی در درون لایه‌های مارتنزیت و آستنیت باقیمانده و مرحله دوم با بزرگ شدن ذرات کاربیدی همراه است. همچنین آنیل در دماهای میان‌بحرانی نیز دارای سه مرحله می‌باشد؛ مرحله اول بازگشت مارتنزیت، مرحله دوم جوانه‌زنی و رشد دانه‌های آستنیت و حذف ذرات کاربیدی و مرحله سوم درشت شدن ساختار دوفازی و افت سختی می‌باشد. افزایش دما تا دماهای فرابحرانی نیز سبب ظهور این سه مرحله می‌شود ولی با توجه به این‌که افزایش دما سبب کاهش طول مدت این مراحل و ادغام آن‌ها در یکدیگر می‌شود، تمایز دو مرحله اول سخت‌تر است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Microstructural Evolution of C-Mn Dual Phase Steel During Intermediate Quenching: A Comparative Study of Subcritical, Intercritical, and Suppercritical Annealing

نویسندگان [English]

  • M. Jaberi 1
  • M. Rezayat 2
  • S. Hossein-Nedjad 1
1 Faculty of Materials Engineering, Sahand University of Technology, Tabriz, 51335-1996, Iran
2 Department of Materials Engineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran
چکیده [English]

Martensitic microstructure, due to its numerous nucleation sites for austenite and its fibrous distribution, is considered as the initial microstructure in the dual-phase steel fabrication process, specifically during intermediate quenching. In the present study, the microstructural evolution of a carbon-manganese steel during intermediate quenching at three temperature ranges (upper-critical (Ac₃<T), inter-critical (Ac₁<T<Ac₃) and sub-critical (T<Ac₁)) was studied using optical microscopy, scanning electron microscopy, and X-ray diffraction analysis. Hardness measurements indicated that the sub-critical annealing process, which is the high-temperature tempering process, consists of two stages with different softening rates. The first stage is associated with the removal of carbon from the lattice structure to form carbides, and the second stage is accompanied by the coarsening of carbides. Annealing martensitic microstructure at intercritical temperatures also occurs in three stages: The first stage is the tempering of martensite, the second stage is the nucleation and growth of austenite in tempered martensite with the dissolution of carbides, and the third stage is the coarsening of the two-phase microstructure, which is associated with a reduction in hardness. An increase in temperature to upper-critical temperatures also causes the appearance of these three stages, but due to the accelerated diffusion at high temperatures, these stages are shortened and merged together.

کلیدواژه‌ها [English]

  • Dual-phase steel
  • Intermediate quenching
  • Secondary hardening
  • Microstructural evolution
  • Hardness

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مواد پیشرفته در مهندسی
دوره 43، شماره 3
مهر 1403
صفحه 1-16

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