| Summary: | The dynamic recrystallization (DRX) behavior of 47Zr-45Ti-5Al-3V alloy was studied by using the experiment and numerical simulation method based on DEFORM-3D software and cellular automata (CA) over a range of deformation temperatures (850 to 1050 °C) and strain rates (10<sup>−3</sup> to 10<sup>0</sup> s<sup>−1</sup>). The results reveal that the DRX behavior of 47Zr-45Ti-5Al-3V alloy strongly depends on hot-working parameters. With rising deformation temperature (<i>T</i>) and decreasing strain rate (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mover accent="true"><mi>ε</mi><mo>˙</mo></mover></semantics></math></inline-formula>), the grain size (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>d</mi><mrow><mi>D</mi><mi>R</mi><mi>X</mi></mrow></msub></mrow></semantics></math></inline-formula>) and volume fraction (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi mathvariant="normal">X</mi><mrow><mi>D</mi><mi>R</mi><mi>X</mi></mrow></msub></mrow></semantics></math></inline-formula>) of DRX dramatically boost. The kinetics models of the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>d</mi><mrow><mi>D</mi><mi>R</mi><mi>X</mi></mrow></msub></mrow></semantics></math></inline-formula> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi mathvariant="normal">X</mi><mrow><mi>D</mi><mi>R</mi><mi>X</mi></mrow></msub></mrow></semantics></math></inline-formula> of DRX grains were established. According to the developed kinetics models for DRX of 47Zr-45Ti-5Al-3V alloy, the distributions of the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>d</mi><mrow><mi>D</mi><mi>R</mi><mi>X</mi></mrow></msub></mrow></semantics></math></inline-formula> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi mathvariant="normal">X</mi><mrow><mi>D</mi><mi>R</mi><mi>X</mi></mrow></msub></mrow></semantics></math></inline-formula> for DRX grains were predicted by DEFORM-3D. DRX microstructure evolution is simulated by CA. The correlation of the kinetics model is verified by comparing the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>d</mi><mrow><mi>D</mi><mi>R</mi><mi>X</mi></mrow></msub></mrow></semantics></math></inline-formula> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi mathvariant="normal">X</mi><mrow><mi>D</mi><mi>R</mi><mi>X</mi></mrow></msub></mrow></semantics></math></inline-formula> between the experimental and finite element simulation (FEM) results. The nucleation and growth of dynamic recrystallization grains in 47Zr-45Ti-5Al-3V alloy during hot-working can be simulated accurately by CA simulation, comparing with FEM.
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