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Constitutive Model Parameter Identification Based on Optimization Method and Formability Analysis for Ti6Al4V Alloy.

Xuewen Chen1, Bo Zhang1, Yuqing Du1

  • 1School of Materials Science and Engineering, Henan University of Science and Technology, 263 Kaiyuan Avenue, Luoyang 471023, China.

Materials (Basel, Switzerland)
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PubMed
Summary
This summary is machine-generated.

This study optimizes the high-temperature constitutive model for Ti6Al4V titanium alloy using genetic algorithms and response surface methodology. The research establishes optimal hot working domains for enhanced formability and material processing.

Keywords:
Ti6Al4V alloyformabilityhigh-temperature constitutive modelhot processing mapresponse surface methodreverse optimization

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Area of Science:

  • Materials Science
  • Mechanical Engineering

Background:

  • Titanium alloy (Ti6Al4V) is crucial in aerospace and medical fields due to its high strength-to-weight ratio.
  • Accurate constitutive models are essential for simulating plastic forming and optimizing hot forging processes.

Purpose of the Study:

  • To develop and validate a high-temperature constitutive model for Ti6Al4V alloy.
  • To establish the hot working diagram and identify optimal forming conditions for Ti6Al4V alloy.

Main Methods:

  • High-temperature compression tests (800-1000 °C, 0.01-5 s⁻¹) using a Gleeble-1500D machine.
  • Inverse optimization using response surface methodology and genetic algorithms (GA) to identify constitutive model parameters.
  • Development of a dynamic material model to create the hot processing map.

Main Results:

  • An optimized Hansel-Spittel constitutive model with high accuracy (R=0.999, AARE=0.048) was developed.
  • Optimal hot working domains for Ti6Al4V alloy were identified as 840-920 °C/0.01-0.049 s⁻¹ and 940-980 °C/0.11-1.65 s⁻¹.
  • Microstructural analysis confirmed optimal conditions, showing fine, equiaxed grains and a significant β phase at 850 °C/0.01 s⁻¹.

Conclusions:

  • The developed constitutive model accurately predicts the flow stress behavior of Ti6Al4V alloy at elevated temperatures.
  • The established hot working map provides crucial guidance for optimizing the hot forming processes of Ti6Al4V alloy.
  • The study successfully determined optimal processing parameters for Ti6Al4V alloy, enhancing its formability and application potential.