جوشکاری همزن اصطکاکی مونل 400: بررسی ریزساختار، زیرساختار و خواص مکانیکی

نوع مقاله : علمی و پژوهشی

نویسنده

• اکبر حیدرزاده

دانشگاه شهید مدنی آذربایجان

10.22067/ma.v31i2.68236

چکیده

در این تحقیق، خواص ناحیه جوش همزن اصطکاکی مونل 400 شامل ریزساختار، زیرساختار و سختی مورد بررسی و مقایسه با فلز پایه قرار گرفت. برای این منظور، ورق­ مونل 400 به ضخامت 2 میلیمتر تحت جوشکاری همزن اصطکاکی در سرعت چرخش ابزار 400 دور بر دقیقه و سرعت پیشروی ابزار 100 میلیمتر بر دقیقه قرار گرفت. برای آنالیز ریزساختار و مرزدانه ها در نواحی فلز پایه و ناحیه جوش از آنالیز پراش الکترون‌های برگشتی و برای بررسی زیرساختار از میکروسکوپ الکترونی عبوری بهره گرفته شد. همچنین، برای اندازه­گیری سختی از آزمون میکروسختی استفاده گردید. نتایج نشان دادند که ریزدانه شدن، افزایش چگالی نابجایی و افزایش فاکتور تیلور، عوامل اصلی در بهبود سختی ناحیه جوش می­باشند

کلیدواژه‌ها

• مونل
• جوشکاری همزن اصطکاکی
• ریزساختار

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عنوان مقاله [English]

Friction Stir Welding of Monel 400: Microstructure, Substructure, and Mechanical Properties

نویسنده [English]

• Akbar Heidarzadeh

Azarbaijan Shahid Madani University

چکیده [English]

In this study, the microstructure, substructure and hardness of the friction stir welded Monel 400 were investigated and compared with those of the base metal. For this purpose, the Monel 400 plates were friction stir welded at a tool rotational speed of 400 rpm, and a tool traverse speed of 100 mm/min. For characterizing the microstructure and grain boundaries in base metal and stir zone, the electron backscattered diffraction was utilized. The transmission electron microscopy was used for studying the substructures. In addition, microhardness test was conducted to hardness measurement. The results showed that the grain refinement, increasing in dislocation density and Taylor factor were the main reasons of the higher hardness of the stir zone.

کلیدواژه‌ها [English]

• Monel
• Friction Stir Welding
• Microstructure

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