مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

ارزیابی رفتار ترمومکانیکی سوپرآلیاژ نسل جدید پایه کبالت نیکل Co-Ni-Al-Cr-W-Ti-Ta-Nb-Mo-C-B (%wt) با استفاده از معادلات بنیادی و نقشه فرایند تغییر شکل

نوع مقاله : پژوهشی اصیل

نویسندگان
مریم مرکباتی
محمد جواد کریمیان
حسن بدری
مجتمع دانشگاهی مواد و فناوری های ساخت، دانشگاه صنعتی مالک اشتر تهران
10.52547/mme.23.3.191
چکیده
هدف از پژوهش حاضر، بررسی رفتار کار داغ سوپرآلیاژ پایه کبالت نیکل نسل جدید با ترکیب شیمیایی Co-22.8Ni-3.4Al-8Cr-17.1W-1.5Ti-2.8Ta-1.5Nb-1.5Mo-0.06C-0.02B(%wt) به واسطه انجام آزمایش فشار، ارائه معادله بنیادی و نقشه فرایند تغییر شکل و تعیین مناطق امن و نا امن تغییر شکل است. در این راستا آزمایش فشار داغ در محدوده دمایی1200-1050 درجه سانتیگراد، با گام50 درجه سانتیگراد و نرخ‌های کرنش 1/0 ، 01/0 و 001/0 بر ثانیه تا کرنش 7/0 انجام شد. ارزیابی معادلات بنیادی حاکم بر فرایند تغییر شکل داغ سوپرآلیاژ، نشان داد که مدل ارائه شده براساس معادله سینوس هایپربولیک، نتایج تجربی را با دقت قابل قبولی پیش‌بینی می‌نماید. با استفاده از معادله اشاره شده، انرژی فعال‌سازی تغییر شکل داغ آلیاژ مورد بررسی در پژوهش حاضر، 497 کیلو ژول بر مول بدست آمد. بر اساس نقشه فرآیند ترسیم شده برای آلیاژ مورد بررسی در پژوهش حاضر در کرنش 4/0، یک منطقه ناپایداری در دمای 1050 درجه سانتیگراد و نرخ کرنش 01/0 بر ثانیه مشاهده شد. این درحالی است ‌که با افزایش دمای تغییرشکل، گستره و شدت منطقه ناپایداری کاهش یافت. با توجه به نتایج حاصل از نقشه فرایند و معادلات بنیادی، شرایط بهینه تغییر شکل آلیاژ مورد بررسی در محدوده دمایی 1150 درجه سانتیگراد تا 1200 درجه سانتیگراد و نرخ کرنش 1/0 برثانیه و محدوده دمایی 1100 درجه سانتیگراد تا 1200 درجه سانتیگراد و نرخ کرنش‌های 01/0 بر ثانیه تا 001/0 بر ثانیه با حداکثر بازده مصرف انرژی 45 درصد تعیین شد.
کلیدواژه‌ها
سوپرآلیاژ نسل جدید پایه کبالت نیکل
آزمایش فشار داغ
معادلات بنیادی
نقشه‌ فرایند تغییر شکل

موضوعات

عنوان مقاله English

Evaluation of the thermomechanical behavior of the new generation nickel-cobalt Co-Ni-Al-Cr-W-Ti-Ta-Nb-Mo-C-B (%wt) superalloy Using constitutive equations and deformation processing maps

نویسندگان English

Maryam Morakabati
mohammad javad karimian
hassan badri
Faculty of materials and manu facturing Technologies, Malek Ashtar university of Technology
چکیده English

The purpose of this research is to investigate the hot working behavior of the cobalt-nickel base superalloy with the chemical composition of Co-22.8Ni-3.4Al-8Cr-17.1W-1.5Ti-2.8Ta-1.5Nb-1.5Mo-0.06C-0.02B (%wt) by performing compression test, providing the constitutive equation and deformation procssing map and determining the safe and unsafe regions of deformation. In this regard, the hot compression test was performed in the temperature range of 1050-1200 degrees Celsius, with a step of 50 degrees Celsius and strain rates of 0.1, 0.01 and 0.001/s up to a strain of 0.7. The evaluation of the constitutive equations governing the hot deformation process of the superalloy showed that the presented model based on the hyperbolic sine equation predicts the experimental results with acceptable accuracy. Using the mentioned equation, the hot deformation activation energy of the investigated alloy in the present study was obtained as 497 kJ/mol. Based on the process in map drawn for the investigated alloy in the present study, at a strain of 0.4, an instability region was observed at a temperature of 1050 degrees Celsius and a strain rate of 0.01 1/s. the extent and intensity of instability region decreased with the increase in deformation temperature. According to the results of the processing map and the constitutive equations, the optimal conditions of deformation of the investigated alloy are in the temperature range of 1150 to 1200 and the strain rate of 0.1 1/s and the temperature range of 1100 to 1200 and the strain rate of 0.1 to 0.001 the peak efficiency of 45% energy consumption.

کلیدواژه‌ها English

new generation cobalt-nickel base superalloy
Hot compression test
Constitutive equations
deformation processing map
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مهندسی مکانیک مدرس
دوره 23، شماره 3
اسفند 1401
صفحه 191-197