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A Multiphysics Model for Predicting Microstructure Changes and Microhardness of Machined AerMet100 Steel
Wenqian Zhang1, Xupeng Chen1, Chongwen Yang2
1Hubei Key Laboratory of Modern Manufacturing Quality Engineering, School of Mechanical Engineering, Hubei University of Technology, Wuhan 430068, China.
Materials (Basel, Switzerland)
|July 9, 2022
Summary
This study models microstructure and microhardness changes in machined ultra-high-strength steel. The developed multiphysics model accurately predicts surface integrity, crucial for material performance.
Area of Science:
- Materials Science
- Mechanical Engineering
- Metallurgy
Background:
- Surface integrity is vital for the performance of ultra-high-strength steels, influencing corrosion resistance and fatigue life.
- Machining processes significantly alter the surface microstructure and properties of advanced steels like AerMet100.
- Understanding these alterations is key to optimizing manufacturing and ensuring component reliability.
Purpose of the Study:
- To develop a multiphysics model for predicting microstructure evolution and microhardness in machined AerMet100 steel.
- To investigate the effects of stress, strain, and temperature on phase transformation and dislocation density during machining.
- To establish correlations between machining parameters and resulting surface characteristics.
Main Methods:
- A finite-element model of orthogonal cutting was constructed to simulate stress, strain, and temperature fields.
- Analytical models for phase transformation and dislocation density evolution were developed based on simulated multiphysics fields.
- Experimental validation was performed by comparing predicted cutting forces, white-layer thickness, and microhardness with measured data.
Main Results:
- The multiphysics model accurately predicted cutting forces, white-layer thickness, and microhardness variations.
- The model successfully incorporated the influence of stress and plastic strain on phase transformation temperatures.
- A clear correlation was established between machining parameters and the final machined-surface characteristics.
Conclusions:
- The developed multiphysics model provides a reliable tool for predicting the surface integrity of machined ultra-high-strength steels.
- The findings enhance understanding of microstructural changes during machining, particularly the formation of the white layer.
- The model enables optimization of machining processes to achieve desired surface properties for improved material performance.
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