شبیه‌سازی مکانیکی-حرارتی و ریزساختاری فرآیند جوشکاری اصطکاکی دورانی آلیاژ اینکونل718 با استفاده از روش اجزای محدود

نوع مقاله : مقاله پژوهشی

نویسندگان

ISFAHAN UNIVERSITY OF TECHNOLOGY

چکیده

جوشکاری اصطکاکی دورانی یکی از روش‌های مهم اتصال قطعات مختلف جهت استفاده در صنایع پیشرفته به شمار می‌رود. با توجه به مشکلات اندازه‌گیری متغیرها در حین آزمون عملی و به منظور کاهش هزینه‌ها، استفاده از روش‌های شبیه‌سازی عددی یک امکان بسیار موثر در تحقیقات علمی به شمار می‌رود. در این مقاله روش شبیه‌سازی عددی اجزای محدود برای شبیه‌سازی پیوسته مکانیکی-حرارتی و سپس معادلات مشخصه برای شبیه‌سازی ریزساختاری اتصال دو لوله مشابه از جنس آلیاژ اینکونل 718 به روش جوشکاری اصطکاکی دورانی مورد استفاده قرار گرفت. ابتدا با انجام شبیه‌سازی عددی مکانیکی-حرارتی پارامترهای مهم مؤثر بر تحولات متالورژیکی مثل توزیع دما، تنش و کرنش بدست آمد و سپس تحولات ریزساختاری مانند کسر حجمی تبلور مجدد و اندازه دانه ساختار نهایی محاسبه و به منظور صحت‌سنجی با نتایج آزمون عملی مقایسه شد. در شبیه‌سازی ریزساختاری با بهره‌گیری از الگوی جانسون-آورامی و زیرروال‌نویسی این الگو به زبان فرترن، خروجی‌‌های حاصل از حل مکانیکی-حرارتی به متغیرهای متالورژیکی تبدیل شدند. با استفاده از این الگو ضخامت ناحیه متأثر از تبلور مجدد برای مرکز و دیواره ضخامت لوله به ترتیب 480 و850 میکرومتر در شبیه‌سازی محاسبه شد. این مقادیر در آزمون عملی به ترتیب 500 و800 میکرومتر گزارش شدند. همچنین تغییرات اندازه دانه از مرکز لوله و مجاور فصل مشترک جوش تا دیواره لوله درشبیه‌سازی از 07/2 تا 15/2 میکرومتر پیش‌بینی شد که این روند در آزمون عملی از 9/1 تا 2/2 میکرومتر گزارش شده بود. نهایتاً در این مقاله تلاش شد تا با رسم منحنی‌های مختلف ارتباط بین متغیرهای مکانیکی-حرارتی و ریزساختاری بررسی و نتایج قابل انتظاری از توزیع متغیرهای ریزساختاری با تغییر متغیرهای مکانیکی-حرارتی حاصل گردد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Thermomechanical and microstructural simulation of rotary friction welding process of Inconel718 alloy using the finite element method

نویسندگان [English]

  • Aboozar Taherizadeh
  • hossein. mani
  • Mohammad Silani
ISFAHAN UNIVERSITY OF TECHNOLOGY
چکیده [English]

Rotary friction welding is one of the most important techniques for joining different parts in advanced industries. 
Measuring the history of thermomechanical and microstructural parameters can be challenging and costly. To address these challenges, the finite element method was used to simulate thermomechanical and microstructural aspects of the welding of identical superalloy Inconel718 tubes. Therefore, in this research, thermomechanical and microstructural simulations were developed to calculate essential mechanical and metallurgical parameters such as temperature, strain, strain rate, volume fraction of dynamic recrystallization, and grain size distribution. Some of these parameters were then used to be verified with experimental test results. In the microstructural simulation, the Johnson-Avrami model was applied to convert thermomechanical parameters to metallurgical factors by using a FORTRAN subroutine. By employing the dynamic recrystallization kinetics model, the thickness of the recrystallization zone in the wall thickness was calculated to be 480 and 850 micrometers at the center and edge of the tube wall, respectively. These values were reported in the experimental measurements as 500 and 800 micrometers, respectively. Additionally, the grain size change from the center to the edge of the wall thickness, close to the weld interface, were predicted from 2.07 to 2.15 micrometers by simulations, which was comparable with the experimental measurements of 1.9 to 2.2 micrometers. Also, different types of curves were represented to investigate the correlation between thermomechanical and microstructural parameters. Predictable results were concluded from microstructure evolutions with changes by thermomechanical results.

کلیدواژه‌ها [English]

  • Rotary friction welding
  • Finite element method
  • Inconel718
  • Microstructural simulation
  • Johnson-Avrami model
  • subroutine

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