تأثیر زمان اتصال بر ریزساختار و تکمیل انجماد ایزوترم در خلال اتصال TLP سوپر آلیاژهای پایه نیکل غیرمشابه IN738LC و Nimonic 75
الموضوعات :
میثم خاکیان قمی
1
(دکتری مهندسی مواد و متالورژی، مدیر مهندسی بازسازی شرکت مهندسی موادکاران- مپنا، کرج، ایران.)
محمد سعید شهریاری
2
(کارشناس ارشد مهندسی مواد و متالورژی، مدیر مهندسی بازسازی قطعات هوایی شرکت مهندسی موادکاران- مپنا، کرج، ایران.)
سعید ناطق
3
(استاد، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات، دانشکده مهندسی مواد و متالورژی، تهران، ایران.)
الکلمات المفتاحية: ریزساختار, سوپرآلیاژ نایمونیک 75 و اینکونل 738, اتصال TLP, انجماد ایزوترم,
ملخص المقالة :
اتصال سوپر آلیاژهای پایه نیکل اینکونل 738 و نایمونیک 75 با استفاده از لایه واسط حاوی Ni-Cr-B و با نام تجاری MBF-80 توسط فرآیند فاز مایع گذرا (TLP) در دماهای ℃1080، ℃1120، ℃1150 و ℃1180 و زمان‌های مختلف انجام شد. ریزساختار اتصال با استفاده از میکروسکوپ الکترونی روبشی (SEM) و میکروسکوپ نوری مورد مطالعه قرار گرفت. بررسی‌های ریزساختاری نشان داد که در زمان‌های کوتاه اتصال، ریزساختار شامل فازهای بین فلزی یوتکتیکی پیوسته در خط مرکزی اتصال می‌باشد و با افزایش زمان اتصال در دمای ثابت به‌تدریج از پیوستگی آن کم و نهایتاً به‌طور کامل حذف می‌شوند. به‌منظور پیش‌بینی زمان لازم برای تکمیل انجماد ایزوترم از معادلات نفوذ فیک استفاده شد و مشاهده گردید که تطابق خوبی بین زمان پیش‌بینی شده برای تکمیل انجماد ایزوترم و نتایج تجربی وجود دارد.
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[2] "Nimonic 75 alloy, Special Metals Corporation". 2014.
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[4] M. Haafkens & J. Matthey, "A new approach to the weldability of nickel-base As-cast and power metallurgy superalloys", Weld. Journal, vol. 61, pp. 25-30, 1982.
[5] M. Abdelfatah & O. Ojo, "On the extension of processing time with increase in temperature during transient-liquid phase bonding", Metallurgical and Materials Transactions A. vol. 40, pp. 377-385, 2009.
[6] J. Mattheij, "Role of brazing in repair of superalloy components–advantages and limitations", Materials science and technology. vol. 1, pp. 608-612, 1985.
[7] M. Mosallaee, A. Ekrami, K. Ohsasa & K. Matsuura, "Microstructural evolution in the transient-liquid-phase bonding area of IN-738LC/BNi-3/IN-738LC", Metallurgical and Materials Transactions A. vol. 39, pp. 2389-2402, 2008.
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[9] A. Rabinkin, "Brazing with (NiCoCr)–B–Si amorphous brazing filler metals: alloys, processing, joint structure, properties, applications", Science and Technology of Welding & Joining, vol. 9, pp. 181-199, 2004.
[10] D. Duvall, W. Owczarski & D. Paulonis, "TLP bonding: a new method for joining heat resistant alloys", Pratt and Whitney Aircraft, Middletown, CO. 1974.
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[18] P. Sung & D. Poirier, "Liquid-solid partition ratios in nickel-base alloys", Metallurgical and Materials Transactions A, vol. 30, pp. 2173-2181, 1999.
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