بررسی تجربی و عددی ایجاد دانه‌ سرگردان در فرآیند رشد تک‌بلور سوپرآلیاژ پایه نیکل

نوع مقاله : علمی و پژوهشی

نویسندگان

• محسن قنبری حقیقی
• سعید شبستری
• محمدرضا ابوطالبی

علم و صنعت ایران

10.22067/ma.v28i2.35238

چکیده

جوانه‌زنی دانه‌های سرگردان در فرآیند رشد تک‌بلور به روش بریجمن در سرعت رشد 3، 5 و 7 میلی‌متر بر دقیقه مورد ارزیابی قرار گرفت. بررسی‌ها نشان‌دهنده کاهش گرادیان دمایی در اثر افزایش سرعت حرکت نمونه از کوره و جوانه‌زنی دانه‌های سرگردان در جلوی جبهه رشد دانه-های ستونی است. بررسی‌های عملی رشد تک‌بلور سوپرآلیاژ پایه نیکل نشان داد که سرعت رشد 3 میلی‌متر بر دقیقه منجر به ایجاد ساختار تک‌بلور با جهت بلوری نزدیک به >001< در راستای خروج حرارت می‌شود. در سرعت‌های رشد بیش از 3 میلی‌متر بر دقیقه، جوانه‌زنی دانه هم‌محور رخ می‌دهد.

کلیدواژه‌ها

• رشد تک‌بلور
• دانه‌های سرگردان
• گرادیان دمایی
• سرعت رشد
• شبیه‌سازی عددی

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عنوان مقاله [English]

Numerical and Experimental Evaluation of Stray Grains Formation During Single Crystal Growth

نویسندگان [English]

• mohsen Ghanbari
• Saeed Shabestari
• Mohammad Reza Aboutalebi

Iran University of Science and Technology.

چکیده [English]

Stray grain formation during single crystal growth with growth rates of 3, 5 and 7 mm/min has been assessed. The results revealed that increasing the growth rate resulted in the decrement of thermal gradient in the solidification front and caused stray grain formation in the solidification front of the columnar grain growth. Experimental and numerical results showed that a well-oriented single crystal structure is obtained at a growth rate of 3 mm/min in Ni-based superalloy. Stray grain formation occurred at growth rates greater than 3 mm/min, as a result of high growth rate and low thermal gradient.

کلیدواژه‌ها [English]

• Single Crystal Growth
• Stray Grains Formation
• Thermal Gradient
• Growth Rate
• Numerical simulation

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