پیش‌بینی رفتار شارش داغ فولاد میکروآلیاژی با استفاده از مدل جانسون-کوک اصلاح‌شده

نوع مقاله : علمی و پژوهشی

نویسندگان

1 گروه مهندسی مکانیک، واحد الیگودرز دانشگاه آزاد اسلامی، الیگودرز، ایران.

2 دانشکده مهندسی مکانیک، دانشگاه صنعتی اراک، اراک، ایران.

چکیده

مدل‌های رفتاری به‌عنوان ابزاری قدرتمند برای پیش‌بینی رفتار پیچیدۀ ماده در شرایط پیچیده تغییر شکل استفاده می‌شوند. این معادلات می‌توانند رفتار شارشی مواد را با دقت مناسب در شرایط تغییر شکل مدل‌سازی و کنترل کنند. در این تحقیق یک مدل اصلاح‌شده از مدل رفتاری جانسون-کوک که در آن پارامترهای تغییر شکل دما، نرخ کرنش و کرنش در نظر گرفته ‌شده است برای پیش‌بینی رفتار فولاد میکروآلیاژی L80 که دارای کاربرد گسترده در لوله‌های فولادی است، توسعه داده ‌شده است. برای توسعۀ این مدل از داده‌های آزمون‌های فشار داغ تک‌محوره در دماهای 1373-1173 کلوین و نرخ‌های کرنش 1-001/0 بر ثانیه استفاده ‌شده است. نتایج تحلیل ریزساختاری، رفتار شارشی ماده را به‌درستی توصیف می‌کند. بررسی نتایج نشان می‌دهد که مدل توسعه داده‌شده با درنظرگرفتن اثرات نرم‌شوندگی حاصل از دما و سخت‌شوندگی ناشی از کرنش و نرخ کرنش، پیش‌بینی مناسبی از رفتار کار داغ فولاد میکروآلیاژی ارائه کرده است و می‌توان از این مدل در شبیه‌سازی فرایندهای تولید این فولاد در دما بالا استفاده کرد.

کلیدواژه‌ها


عنوان مقاله [English]

Predication of Hot Flow Behavior of Micro-Alloy Steel Using Modified Johnson-Cook Model

نویسندگان [English]

  • Hamid Ahmadi 1
  • Hamidreza Rezaei Ashtiani 2
  • Mohamad Heidari 1
1 Department of Mechanical Engineering, Aligudarz Branch, Islamic Azad University, Aligudarz, Iran.
2 School of Mechanical Engineering, Arak University of Technology, Arak, Iran.
چکیده [English]

Constitutive models can be used as a powerful tool to predict the complex behavior of materials under different deformation conditions. These equations can model and control the flow behavior of materials with appropriate accuracy by considering the parameters affecting the behavior of the material. In this study, a modified Johnson-Cook model has been developed to predict the hot working behavior of L80 micro alloy steel at various deformation parameters such as temperature, strain rate, and strain. In order to develop this model, experimental data related to hot compression tests at a temperature range of 1173-1373 K and strain rates of 0.001-1 s-1 have been used. The results of the microstructure correctly describe the flow behavior of the material. The results show that the developed model, taking into account the softening effects of temperature as well as strain and strain rate hardening, provides a good prediction of the hot working behavior of micro-alloy steel and this developed model can be used to simulate the production processes of this steel at high temperatures.

کلیدواژه‌ها [English]

  • Constitutive equation
  • Modified Johnson-Cook model
  • Hot Deformation
  • Flow stress
  • Microstructure
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