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Method for predicting martensite structure evolution in high-strength plastic product steel quenching

A high-strength plastic product, martensitic transformation technology, applied in the field of steel rolling, can solve the problems of low efficiency, material and financial resources, etc.

Active Publication Date: 2014-08-20
NORTHEASTERN UNIV
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Problems solved by technology

[0005] At present, the analysis of the microstructure transformation law in the quenching of high-strength plastic product steel mainly relies on experimental means, which consumes material and financial resources, and the efficiency is low; A new method is proposed; the combination of physical metallurgy principles and cellular automata theory is used to predict the evolution of martensite in the quenching of high-strength plastic product steel, which can realize the microstructure of martensite and retained austenite , Quantitative, precise and visual description of the volume fraction, providing guidance for further analysis of the evolution of the microstructure; but there is no

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  • Method for predicting martensite structure evolution in high-strength plastic product steel quenching
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  • Method for predicting martensite structure evolution in high-strength plastic product steel quenching

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Embodiment 1

[0065] The process flow of the method for predicting the evolution of martensitic structure in the quenching of high-strength plastic product steel in the present invention is as follows figure 1 As shown, the steps are:

[0066] 1. Start;

[0067] 2. Establish a two-dimensional cell space;

[0068] 3. Generate the initial grain of the parent phase;

[0069] 4. Given the initial state of the cell;

[0070] The model assigns each cell 4 state variables:

[0071] (a) Carbon content variable, the initial carbon content of the cell is the mole fraction of the carbon content in the high-strength plastic product steel;

[0072] (b) Orientation variable. Randomly take a number between 1 and 180 as the orientation value for the newly generated martensite cell, and point out the martensite bundle it belongs to. Those with the same orientation value belong to the same martensite bundle. The martensite bundles correspond to different colors;

[0073] (c) Phase transformation flag v...

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Abstract

The invention discloses a method for predicting martensite structure evolution in high-strength plastic product steel quenching. The method comprises the following steps: (1) establishing a two-dimensional cellular space; (2) generating parent phase initial structure grains; (3) giving an initial state of cells; (4) inputting a total temperature drop omega, a temperature drop increment delta omega and a cooling rate; (5) calculating martensite phase transformation thermodynamics, and determining a martensite phase transformation starting temperature; (6) judging the martensite nucleation condition of each cell; (7) judging the martensite phase growth of each cell according to the growth rule; (8) calculating a martensite transformation fraction and a residual austenite fraction; and (9) outputting a dynamic evolution diagram of structure morphologies of martensite, residual austenite and the like in the phase transformation process, and outputting a martensite transformation volume fraction curve. By adopting the method, prediction of the martensite structure evolution in the high-strength plastic product steel quenching can be realized, prediction of the structure morphologies and volume fractions of the martensite and the residual austenite can be realized, the experimental cost is saved, and the period of new steel development is shortened.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and in particular relates to a method for predicting the evolution of martensite structure in quenching of high-strength plastic-laminated steel. Background technique [0002] With the increasing requirements of the automotive industry for both lightweight and high safety, many scholars have devoted themselves to the research and development of the third generation of advanced high-strength automotive steel in recent years. The third-generation advanced high-strength automotive steel takes into account the microstructure characteristics of the first-generation and second-generation high-strength automotive steels, and makes full use of grain refinement, solid solution strengthening, precipitation strengthening and dislocation strengthening to improve Its strength, and through strain-induced plasticity, twin-induced plasticity and other means to improve plasticity. [0003] High-strength pl...

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Application Information

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IPC IPC(8): C21D1/18G06F19/00
Inventor 支颖刘伟杰刘相华
Owner NORTHEASTERN UNIV
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