Method for predicting structure evolution of austenite dynamic recrystallization in thermal deformation of plate-strip steel

A technology of recrystallized structure and hot deformation, applied in the field of steel rolling, to achieve the effect of speeding up the development cycle and saving the experimental cost

Inactive Publication Date: 2009-12-02
NORTHEASTERN UNIV
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Problems solved by technology

[0003] Aiming at the deficiencies in the current analysis methods for structural changes in the hot rolling process of strip steel, the present invention provides a method for predicting the evolution of austenite dynamic recrystallization structure in hot deformation of strip steel

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  • Method for predicting structure evolution of austenite dynamic recrystallization in thermal deformation of plate-strip steel

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Embodiment Construction

[0047] like figure 1 As shown, the specific calculation and analysis steps of the method for predicting the evolution of austenite dynamic recrystallization structure in hot deformation of plate and strip steel of the present invention are as follows:

[0048] 1. Start;

[0049] 2. Establish a two-dimensional cell space;

[0050] 3. Generate the initial grain of the parent phase;

[0051] 4. Given the initial state and initial dislocation density of the cell;

[0052] 5. Input the strain amount ε, strain increment Δε, strain rate, and deformation temperature, calculate the total step S=ε / Δε, and initially set I=1;

[0053] 6. Calculate the change of dislocation density with the increase of deformation in the first calculation step;

[0054] 7. For each cell, judge the nucleation condition according to the dislocation density;

[0055] 8. For each cell, judge the grain growth according to the grain growth rule;

[0056] 9. Calculate the change of dislocation density with ...

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Abstract

The invention relates to a method for predicting structure evolution of austenite dynamic recrystallization in thermal deformation of plate-strip steel, which belongs to the technical field of steel rolling. The method achieves the predictions of the transformed fraction, the grain size, the grain morphology and the flow stress of dynamic recrystallization by establishing a dynamic recrystallization physical metallurgical model and a dynamic recrystallization cellular automation model. The method achieves the reproduction of the structure evolution of a metal forming process by a computer, not only can save the experimental cost, but also can accelerate the development cycle of a new type of steel. The developed method for predicting the structure evolution of the austenite dynamic recrystallization in the thermal deformation of the plate-strip steel achieves the quantitative, precise and visual descriptions of the grain morphology, the volume fraction and the grain size of the recrystallization process, and can obtain important parameters of the flow stress and the like, thus the method is significant in further analyzing the evolution law of microstructures.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and in particular relates to a method for analyzing structural changes in the hot rolling process of strip steel. Background technique [0002] There are complex structural changes in the hot rolling process of strip steel, including dynamic recrystallization and dynamic recovery of austenite during rolling deformation, and static recrystallization, static recovery, and metadynamic recovery in the interval between rolling passes. processes such as recrystallization and grain growth. The recrystallization behavior of austenite plays an important role in controlled rolling, and is an important factor affecting the flow stress, and also has an important influence on the austenite transformation behavior in the subsequent cooling process. At present, the analysis of the microstructure change law in the hot rolling process of plate and strip steel mainly relies on experimental means, which cons...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D11/00C21D8/02
Inventor 支颖刘相华喻海良
Owner NORTHEASTERN UNIV
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