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Iranian Journal of Materials Forming، جلد ۶، شماره ۱، صفحات ۴۴-۵۵
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عنوان انگلیسی Flow Stress Modeling In A γ/γ/ Cobalt Base Superalloy by Using Hyperbolic Sine Equation and ANN Method
چکیده انگلیسی مقاله The new class of wrought γ-γ/ Co-base superalloys based on Co-Al-W system which have high volume fraction of γ/ precipitates and good mechanical properties was developed by conventional hot working routes. The aim of the present study was prediction of flow stress and hot deformation modeling of a novel γ-γ/ Co-base superalloy. The hot compression tests were carried out over a wide range of temperature (950°C-1200°C) and strain rates (0.001s-1-1s-1). The flow stress analysis, constitutive approach and microstructure characterization were revealed that dynamic recrystallization (DRX) was occurred at high temperature regime (1100°C-1200°C) but not at low temperature one (950°C-1050°C) due to presence of γ/ precipitates. The hot deformation characteristic was studied by hyperbolic sine equation on each abovementioned regimes and ANN approach on overall conditions. The constitutive method indicates good potential for the prediction of flow stress at any separated regimes but the ANN model represented much more appropriate performance. Outstanding predictability of ANN model regardless of γ/ phase participation during thermomechanical processing over all deformation conditions can be considered as another remark of proposed approach.
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نویسندگان مقاله Gholam reza Ebrahimi |
Sabzevar, Iran

Saed Ali Akbari Sani |
Department of Materials Science and Engineering, Iran University of Sience and Technology, Tehran, Iran

Hossein Arabi |
School of Materials and Metallurgical Engineering, Iran University of Science and Technology (IUST), Narmak, Tehran, Iran.

Shahram Kheirandish |
School of Materials and Metallurgical Engineering, Iran University of Science and Technology (IUST), Narmak, Tehran, Iran

نشانی اینترنتی http://ijmf.shirazu.ac.ir/article_5200_1629823c26fc9f22a0312fbd54bfa778.pdf
فایل مقاله اشکال در دسترسی به فایل - ./files/site1/rds_journals/453/article-453-1557036.pdf
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