تأثیر زمان اتصال بر ریزساختار و تکمیل انجماد ایزوترم در خلال اتصال TLP سوپر آلیاژهای پایه نیکل غیرمشابه IN738LC و Nimonic 75
محورهای موضوعی : روش ها و فرآیندهای نوین در تولید
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.)
کلید واژه: ریزساختار, سوپرآلیاژ نایمونیک 75 و اینکونل 738, اتصال TLP, انجماد ایزوترم,
چکیده مقاله :
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.
Joining of Inconel 738 and Nimonic 75 nickel base superalloys using Ni-Cr-B-containing interlayer, MBF-80, performed by transient liquid phase process (TLP) at 1080, 1120, 1150 and 1180°C and different times. Bonding microstructure was studied using a scanning electron microscope (SEM) and a light microscope. Microstructural studies showed that in short bonding time, the microstructure consists of continuous eutectic intermetallic phases in the center line of the joint and with increasing bonding time at constant temperature, eutectic intermetallic phases gradually decrease from the bonding and finally completely disappear. In order to predict the time required to isotherm solidification completion, Fick’s diffusion equations were used and it was observed that there is a good agreement between the predicted time of isotherm solidification completion and experimental results.
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[2] "Nimonic 75 alloy, Special Metals Corporation". 2014.
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[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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