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Austenitizing determination method in metal material heat treatment process

A technology of heat treatment process and metal materials, applied in the fields of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of inability to obtain the experimental data of thermal properties of materials at high temperature stage, experimental conditions, etc., and achieve scientific support for the heat treatment process. , the effect of heat treatment process

Active Publication Date: 2019-06-07
CENT IRON & STEEL RES INST +1
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Problems solved by technology

[0005] In view of the above analysis, the present invention aims to provide a method for measuring austenitization during heat treatment of metal materials, which can be combined with phase transition calculations in addition to conventional temperature field and stress field calculations to obtain phase transition information and thermophysical parameter information , and used to solve the existing numerical simulation. On the one hand, limited by the experimental conditions, it is impossible to obtain the experimental data of the thermal physical properties of the material in the high temperature stage. technical issues affecting

Method used

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  • Austenitizing determination method in metal material heat treatment process
  • Austenitizing determination method in metal material heat treatment process
  • Austenitizing determination method in metal material heat treatment process

Examples

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Embodiment 1

[0098] Taking the calculation of the flat plate welding process of the composition steel in Table 1 as an example, using the above-mentioned multi-field coupling integrated calculation method of thermodynamics and finite element, an example is carried out for the multi-field coupling calculation process of temperature field, stress field and tissue field Operational process demonstrations and instructions, such as Figure 1 to Figure 10 Shown:

[0099] Table 1 Composition content and phase transition temperature of composition steel

[0100] Element

C

Si

mn

Fe

T-A3(°C)

wt%

0.10

0.2

1.4

Rest

830.2

[0101] First, establish a three-dimensional plate butt welding model and divide the mesh, such as Figure 5 shown. It is necessary to set the density, thermal conductivity, elastic modulus, yield strength and other parameters of the material, and the material parameters heat capacity and thermal expansion coefficient (such a...

Embodiment 2

[0104] Taking the calculation of the austenitization process of a steel with a certain upper and lower limit composition in Table 2 as an example, for the above-mentioned multi-field coupling integrated calculation method of thermodynamics and finite element, when the thermal stress calculation is not considered, only the temperature field and The coupling calculation of the tissue field obtains the phase transition under the condition of thermodynamic equilibrium state, and demonstrates and explains the operation process of the example:

[0105] Table 2 Composition of steel and the upper and lower limits of its content

[0106] Element

[0107] First, model the austenitization process of the 300mm*120mm two-dimensional slab in the finite element general software, input the thermophysical parameters of the material, and the heat transfer coefficient in the heating furnace, and calculate the temperature field. In order to obtain the microstructure of the slab at a cer...

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Abstract

The invention relates to an austenitizing determination method in a metal material heat treatment process, and belongs to the technical field of multi-field coupling numerical simulation, and is usedfor solving the technical problems that existing numerical simulation cannot obtain thermophysical property experimental data of a material in a high-temperature stage and the influence of phase change and thermophysical property parameter difference on a multi-field coupling calculation result is not considered when material components are changed. The method comprises the following steps: S1, establishing a method for acquiring phase change and thermophysical parameters of a material according to components and temperature of a metal material; S2, establishing a finite element model of a thermal coupling calculation or heat transfer calculation of a temperature field-stress field; S3, calculating the temperature field or thermal stress of the metal material; S4, acquiring the distribution condition of the temperature field and the thermal stress of the metal material along with the time change; and S5, obtaining an austenitizing determination result in the heat treatment process of the metal material. According to the method, the influence of components on thermophysical parameters and phase change stress is considered, the influence of phase change on a temperature field and residual stress can be accurately calculated, and the method is used for optimizing the heat treatment process of different materials.

Description

technical field [0001] The invention relates to the technical field of multi-field coupling numerical simulation, in particular to a method for measuring austenitization during heat treatment of metal materials. Background technique [0002] In the fields of material design and engineering design, calculation, simulation and other technologies have been widely used, such as first-principles calculation, thermodynamic calculation, phase field model, general finite element and other methods. With the promotion of material genetic engineering projects, the three major elements of high-throughput computing, high-throughput experiments and databases have become important methods and means for material design, reducing material research and development costs and increasing the speed of material research and development. High-throughput job design and calculation methods based on first-principles calculations have been successfully applied in the fields of composition-structure-per...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 杨丽苏航柴锋罗小兵杨才福侯雅青
Owner CENT IRON & STEEL RES INST
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