نوع مقاله : مقاله کامل پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، دانشگاه صنایع و معادن ایران، تهران، تهران، ایران

2 استادیار، پژوهشکده سرامیک، پژوهشگاه مواد و انرژی، مشکین‌دشت، البرز، ایران

3 دانشجوی دکتری، پژوهشکده سرامیک، پژوهشگاه مواد و انرژی، مشکین‌دشت، البرز، ایران

4 دانشجوی دکتری، گروه مهندسی مواد، دانشکده فنی و مهندسی، واحد کرج، دانشگاه آزاد اسلامی، کرج، البرز، ایران

چکیده

آلیاژ IN718 نوعی سوپرآلیاژ پایه نیکل با استحکام بالاست که بیشتر در دماهای متوسط و شرایط کاری خورنده استفاده می‌شود. در پژوهش حاضر، نمونه‌های تولید شده باروش ذوب گزینشی با لیزر (SLM) در دمای 1040 سلسیوس و زمان 120 دقیقه، محلول‌سازی شدند. پس از انحلال، نمونه‌ها در سه محیط سردایش آب، هوا و کوره خاموش‌شده با درِ باز، سردایش شدند. در انتها، نمونه‌ها در سه شرایط استاندارد به مدت زمان 48 و 72 ساعت پیرسازی شدند. برای بررسی تأثیر نرخ سرمایش پس از انحلال و زمان پیرسازی، بر مشخصه رسوبات و ریزساختار نمونه‌ها، از میکروسکوپ الکترونی روبشی نشر میدانی (FESEM)، پراش پرتو ایکس (XRD) و آزمون سختی‌سنجی استفاده شد. نتایج نشان داد که افزایش زمان پیرسازی در شرایط ثابت محلول‌سازی، کسر حجمی و اندازه فازهای ثانویه را افزایش می‌دهد. همچنین، کاهش سرعت سردکردن در مرحله محلول‌سازی، به افزایش سختی نمونه‌ها در مرحله پیرسازی منجر می‌شود. درنهایت، با افزایش زمان پیرسازی، بیشترین سختی نمونه، 794 ویکرز بدست آمد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

The Effect of Cooling Rate After Full Solution and Aging Time on Microstructure and Hardness of IN718 Superalloy Fabricated via SLM

نویسندگان [English]

  • Habib Hematzadeh Dastgerdi 1
  • Mohsen Ostadshabani 2
  • Yazdan Shajari 3
  • Mohsen Samiee 4

1 M.Sc. Student, Iran University of Industries and Mines (IUIM), Tehran, Tehran, Iran

2 Assistant Professor, Department of Ceramics, Materials and Energy Research Center (MERC), Meshkindasht, Alborz, Iran

3 Ph.D. Student, Department of Ceramics, Materials and Energy Research Center, (MERC), Meshkindasht, Alborz, Iran

4 Ph.D. Student, Department of Metallurgy and Materials Engineering, Karaj Branch, Islamic Azad University, Karaj, Alborz, Iran

چکیده [English]

IN718 alloy is a high strength Nickel base superalloy that mainly used in moderate temperatures and corrosive service conditions. In the present study, samples produced by selective laser melting (SLM) at 1040 °C for 120 minutes were prepared under solution treatment. After solution, the samples were cooled in three cooling media of water, air and extinguished furnace with open door. Finally, the samples were aged in three standard conditions for 48 and 72 hours. To investigate the effect of cooling rate after solution and aging time on precipitates characteristics and microstructure of samples, Field Emission Scanning Electron Microscope (FESEM), X-ray diffraction (XRD) and hardness test were used. The results showed that increasing the aging time under constant solution conditions increases the volume fraction and the size of the secondary phases. Also, reducing the cooling rate in the solution step leads to increasing the hardness of the samples in the aging stage. Finally, with increasing aging time, the maximum hardness of the sample was 794H. v.
 

کلیدواژه‌ها [English]

  • IN718 Superalloy
  • selective laser melting
  • cooling rate
  • aging
  • Microstructure
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