بررسی عددی و پیش‌بینی اندازه دانه‌ها در مناطق مختلف جوشکاری اصطکاکی اغتشاشی آلیاژ آلومینیومی 6061

نوع مقاله : مقاله پژوهشی

نویسندگان

1 فارغ التحصیل دانشگاه تبریز

2 عضو هیئت علمی دانشگاه ملایر

3 عضو هیئت علمی دانشگاه ازاد کرمانشاه

چکیده

جوشکاری اصطکاکی اغتشاشی یک تکنیک اتصال حالت جامد می‌باشد که بر اساس دو عامل فشار بزرگ‌تر از تسلیم و تغییر شکل‌های بزرگ پلاستیک اتصال نهایی بین قطعات در هندسه‌های جوش متفاوت صورت می‌پذیرد. اندازه دانه‌هادر مناطق جوش مبتنی بر سه رویداد ریکاوری، تبلور مجدد و رشد دانه‌ها می‌باشد که بر اساس میزان پیشرفت هر کدام از این مراحل، اندازه ذرات نهایی حاصل می‌گردد. در پژوهش حاضر با استفاده از روشی تحلیلی-عددی بر پایه شبیه‌سازی عددی فرایند جوشکاری اصطکاکی اغتشاشی آلیاژ آلومینیم 6061 اندازه ذرات نهایی در نواحی مختلف جوش پیش‌بینی شده است. شبیه‌سازی اجزاء محدود فرایند به واسطه نرم‌افزار آباکوس و با رویکرد کوپل اویلر لاگرانژی صورت پذیرفت. به منظور صحه‌سنجی، نتایج حاصل از مدل نوین با نتایج تجربی مورد مقایسه قرار گرفت، نتایج در مطابقت مناسبی با نتایج تجربی قرار داشت. با توجه به تمرکز حرارت و جریان پلاستیک در منطقه مرکزی جوش، منطقه اغتشاش بیشترین تغییرات ریزساختاری را داشت و میزان اندازه دانه‌ها در این ناحیه دچار کاهش شدیدتری نسبت به سایر مناطق مختلف جوش گردید. بررسی تفاوت اندازه دانه‌ها در دو ناحیه پیش‌رو و پس‌رو نیز مورد مطالعه قرار گرفت و تفاوت مشهودی در اندازه ذرات در این دو ناحیه مشاهده شد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Numerical investigation and prediction of grain size in different friction stir welding areas of AA6061 aluminum alloy

نویسندگان [English]

  • Amir Ghiasvand 1
  • Mahdi Kazemi 2
  • Maziar Mahdipour Jalilian 3
1 Tabriz university
3 Mechanical Engineering Department, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran
چکیده [English]

Friction stir welding is a solid-state bonding technique based on two factors, a pressure greater than the material yield stress and large plastic deformation. The final joint between parts takes place in different welding geometries by using these two factors. The grain sizes in the weld areas are influenced by recovery, recrystallization, and grain growth. In the current research, using an analytical-numerical method based on finite element simulation of friction stir welding of AA6061-T6 alloy, the grain sizes in various welded areas have been predicted. The finite element simulation has been performed based on the coupled Eulerian-Lagrangian approach using ABAQUS software and the results have been verified by experiments. The predicted results were in good agreement with the experimental results. Due to the concentration of heat and plastic flow in the central region of the weld, the stirring region had the most microstructural changes and the grain size in this region decreased more sharply than other different areas of the weld. As the rotational welding speed increases, recrystallization phenomena in the central weld area increases. With increasing the translational welding speed, grain size increased in different welding areas. This increase occurred more severely in the central area of the welded joint.

کلیدواژه‌ها [English]

  • Friction Stir Welding
  • Grain size
  • finite element
  • Weld Zones
  • ALUMINUM ALLOY
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