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Constitutive Modelling Analysis and Hot Deformation Process of AISI 8822H Steel
Khaled Elanany1, Wojciech Borek2, Saad Ebied3
1Silesian University of Technology, 2A Akademicka Str., 44-100 Gliwice, Poland.
Materials (Basel, Switzerland)
|December 17, 2024
Summary
The Trimble model accurately predicts hot deformation in AISI 8822H steel, outperforming other models. This finding aids in optimizing the manufacturing processes for this alloy.
Area of Science:
- Materials Science
- Mechanical Engineering
- Metallurgy
Background:
- Understanding hot deformation behavior is crucial for optimizing manufacturing processes of alloys like AISI 8822H steel.
- Thermomechanical conditions significantly influence material properties and performance.
Purpose of the Study:
- To investigate the hot deformation characteristics of AISI 8822H steel under varying temperatures and strain rates.
- To evaluate the predictive accuracy of different constitutive models for the flow stress of AISI 8822H steel.
- To identify the most suitable model for representing the material's behavior during thermomechanical processing.
Main Methods:
- Utilized the Gleeble 3800 thermomechanical simulator to conduct hot compression tests on AISI 8822H steel.
- Explored temperature ranges from 1173 K to 1323 K and strain rates from 0.01 s⁻¹ to 10 s⁻¹.
- Compared the predictive capabilities of Arrhenius-type, Johnson-Cook, modified Johnson-Cook, and Trimble constitutive models against experimental flow stress data.
Main Results:
- The Trimble model demonstrated the highest accuracy in predicting flow stress, achieving a correlation factor (R) of 0.99 and an average absolute relative error of 1.7%.
- The Johnson-Cook model exhibited the lowest accuracy, with R = 0.92 and an average absolute relative error of 32.2%, attributed to its inability to fully capture softening mechanisms.
- All tested models showed variations in predicting the material's response across the investigated thermomechanical conditions.
Conclusions:
- The Trimble constitutive model is the most effective for accurately characterizing the hot deformation behavior of AISI 8822H steel within the studied parameters.
- The findings provide valuable insights for enhancing the manufacturing process control and material design for AISI 8822H steel.
- Accurate constitutive models are essential for reliable simulation and optimization of metal forming processes.
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