توزیع تنش‌های پسماند در نمونه‌‌های سوپر آلیاژ اینکونل 625 حاصل شده از فرآیند ذوب گزینشی با لیزر به روش المان محدود

نوع مقاله : مقاله علمی

نویسندگان
گروه ساخت و تولید، دانشکده مهندسی مکانیک، دانشگاه صنعتی اصفهان، اصفهان، ایران
چکیده
روش‌های ساخت افزودنی در سال‌های اخیر به دلیل قابلیت‌های زیادشان از جمله مصرف بهینه مواد و کاربردشان در ساخت ساختارهای پیچیده، محبوبیت بسیارخوبی پیدا کرده‌اند. یکی از مهم‌ترین روش‌ها در این فرآیندها، فرآیند ذوب گزینشی با لیزر است. در تحقیقات پیشین، اندازه‌گیری توزیع تنش‌های پسماند در نمونه‌های اینکونل 625 تحت فرآیند ذوب گزینشی با لیزر مورد تحقیق قرار نگرفته است. لذا در این تحقیق، فرآیند ذوب گزینشی با لیزر به وسیله روش شبیه‌سازی به روش المان محدود، بر روی نمونه اینکونل 625 انجام گرفته و سپس توزیع تنش‌های پسماند در نمونه حاصل شده از فرآیند در سه جهت اصلی مورد بررسی قرار گرفته است. همچنین نحوه تشکیل حوضچه مذاب، ابعاد آن و توزیع دما نیز مورد تحقیق قرار گرفته است. نتایج حاصل نشان داد که تنش‌های پسماند کششی در مرکز لایه و تنش‌های پسماند فشاری بیش‌تر در لبه‌های نمونه به‌‌وجود آمده‌اند. همچنین ماکزیمم تنش‌های پسماند در جهت طولی و مینیمم آن‌ها در جهت ضخامت لایه به‌‌وجود آمده‌اند. نتایج مربوط به تاثیر پارامترهای فرآیند بر توزیع تنش‌های پسماند نشان داد که با افزایش توان لیزر، تنش‌های پسماند کششی و فشاری در هر دو جهت محوری و محیطی افزایش می‌یابد ولی کاهش سرعت اسکن، اطلاعات دقیقی از میزان افزایش یا کاهش این تنش‌ها به ما نمی‌دهد. به منظور اعتبارسنجی نیز نتایج حاصل از روش المان محدود با نتایج حاصل از دیگر محققان مقایسه گردید. اختلاف حاصل شده %13/97 بود. در نتیجه توافق خوبی میان آن‌ها برقرار شد.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Residual stress distribution in Inconel 625 superalloy samples obtained from the selective laser melting (SLM) process using the finite element method

نویسندگان English

Amir Aghababaei
Mohsen Badrossamay
Department of Manufacturing and Production, Faculty of Mechanical Engineering, Isfahan university of technology, Isfahan, Iran
چکیده English

Additive manufacturing methods have become very popular in recent years due to their many capabilities, including the optimal use of materials and their use in constructing complex structures. One of the most important methods in these processes is the selective laser melting (SLM) process. In previous research, measuring the residual stress distribution of Inconel 625 samples under the SLM process has not been investigated. Therefore, in this research, the SLM process was carried out on the Inconel 625 sample using the finite element simulation method, and then the residual stress distribution in the sample obtained from the process was investigated in three main directions. Also, the formation of the molten pool, its dimensions, and temperature distribution were investigated. The results showed that tensile residual stresses were formed in the center of the layer and compressive residual stresses were more present at the edges of the sample. Also, the maximum of the residual stresses were formed in the axial direction and their minimum appeared in the layer thickness direction. The results related to the effect of process parameters on the residual stress distribution showed that with increasing laser power, tensile and compressive residual stresses increase in both axial and hoop directions, but decreasing the scanning speed does not give us accurate information about the increase or decrease of these stresses. For validation, the results of the finite element method were compared with the results of other researchers. The obtained difference was 13.97%. Therefore a good agreement existed between them. 

کلیدواژه‌ها English

Additive manufacturing
Selective laser melting
Inconel 625
Residual stress
Finite element simulation
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  • تاریخ دریافت 05 خرداد 1402
  • تاریخ بازنگری 27 مهر 1402
  • تاریخ پذیرش 16 تیر 1402
  • تاریخ اولین انتشار 16 تیر 1402
  • تاریخ انتشار 01 تیر 1402