بررسی فازهای موجود در یک سوپرآلیاژ ریختگی پایه کبالت Co-Al-W با استفاده از روش‌های تجربی و نرم‌افزار JMatPro

نوع مقاله: مقاله کامل علمی پژوهشی

نویسندگان

1 دانشجوی دکتری، دانشکده مهندسی مواد و متالورژی، دانشگاه علم و صنعت ایران، تهران، ایران

2 استاد، دانشکده مهندسی متالورژی و مواد، دانشگاه علم و صنعت ایران

3 استاد، دانشکده مهندسی متالورژی و مواد دانشگاه علم و صنعت ایران

4 دانشیار، گروه مهندسی مواد و پلیمر، دانشکده مهندسی، دانشگاه حکیم سبزواری

10.22034/frj.2018.120874.1030

چکیده

تقاضا برای افزایش راندمان توربین‌های گازی، محرک اصلی برای توسعه نسل‌های جدید مواد دمای بالاست. در ‏این راستا سوپرآلیاژهای جدید پایه کبالت ‏Co-Al-W‏ حاوی فاز استحکام بخش '‏‎γ که پتانسیل مناسبی جهت ‏بکارگیری در دمای بالا دارند مورد توجه قرار گرفته‌اند. هدف اصلی این تحقیق بررسی فازهای ایجاد شده در یک ‏سوپرآلیاژ ریختگی چند عنصری از این خانواده، با استفاده از روش‌های تجربی و نرم‌افزار ‏JMatPro‏ است. به این ‏منظور پس از طراحی آلیاژ، عملیات ریخته‌گری آن در کوره ‏VIM‏ انجام شد. آلیاژ با استفاده از ‏SEM-EDS، ‏FE-SEM، ‏XRD‏ و ‏DSC‏ مورد آنالیز قرار گرفت. نتایج تجربی نشان داد که در زمینه آلیاژ ریختگی (فاز γ)، تنها ‏فاز '‏‎γ و کاربیدهای ‏MC‏ (غنی از تیتانیم و تنگستن) حضور دارند. نتایج نرم‌افزار به خوبی حضور فازهای مذکور ‏و دماهای تشکیل آن‌ها را پیش‌بینی کرد. به علاوه نتایج نرم‌افزار نشان داد که فاز µ باید در ریزساختار آلیاژ ‏وجود داشته باشد. طبق نتایج و پیش‌بینی‌های نرم‌افزار، عملیات حرارتی در دمای ‏900 درجه سانتیگراد و زمان 48 ساعت ‏انجام شد و فاز غنی از تنگستن µ در ریزساختار به وجود آمد. نتایج نشان داد که از نظر ترمودینامیکی تشکیل ‏فاز µ لازم است اما تامین شرایط سینتیکی در تشکیل آن نقش مهمی دارد.‏

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

An Investigation in the Present Phases in a Cast Co-Al-W Cobalt-Base ‎Superalloy Using ‎Experimental Methods and JMatPro Software

نویسندگان [English]

  • Saeed Aliakbari Sani 1
  • Hossien Arabi 2
  • Shahram Kheirandish 3
  • Golamreza Ebrahimi 4
1 PhD Student, School of Materials and Metallurgical Engineering, Iran University of Science and Technology (IUST).
2 Professor, School of Materials and Metallurgical Engineering, Iran University of Science and Technology (IUST).
3 Professor, School of Metallurgy and Materials Engineering, Iran University of Science and Technology
4 Associate Professor, Materials and Polymers Engineering Department, Faculty of Engineering, Hakim Sabzevari University.
چکیده [English]

Demand for improvements of efficiency in the gas turbines is a driving force for development of ‎new materials generations. Recently, novel Co-Al-W cobalt-base superalloys containing ‎strengthening‎ γ' phase which are capable of using at high temperature have been subject of ‎intense research. The main purpose of this study is to investigate and evaluate present phases in ‎a multi-components Co-Al-W superalloy by both experimental methods and JMatPro software. ‎An alloy belong to this category was cast in VIM furnace. The samples were characterized by ‎SEM-EDS, FE-SEM, XRD and DSC instruments. In the as cast condition, it was found that the ‎matrix phase (‎γ‎) only contained gamma prime phase (‎γ') and MC carbides (riched in Ti and W ‎elements). The JMatPro software simulated precisely the present phases and their formation ‎temperature. Moreover, the software data demonstrated the ‎‏µ‏‎ phase must have presented in the ‎microstructure. According to experimental and simulation results, heat treatment at 900°C for ‎‎48 hours was carried out on the alloy which revealed the tungsten-riched ‎‏µ‏‎ phase in the ‎microstructure. It was found that the formation of the thermodynamically stable ‎‏µ‏‎ phase is ‎restricted depending on the kinetics of the reaction.‎

کلیدواژه‌ها [English]

  • Cast Co-Al-W superalloy
  • JMatPro software
  • Prediction of second phases
  • µ phase

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