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A kind of determination method of austenitization during heat treatment of metal materials

A heat treatment process, metal material technology, applied in electrical digital data processing, design optimization/simulation, instruments, etc., can solve problems such as the inability to obtain experimental data on thermal properties of materials at high temperature, and limitations of experimental conditions.

Active Publication Date: 2021-09-14
CENT IRON & STEEL RES INST +1
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  • Abstract
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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

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  • A kind of determination method of austenitization during heat treatment of metal materials
  • A kind of determination method of austenitization during heat treatment of metal materials
  • A kind of determination method of austenitization during heat treatment of metal materials

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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 as Figure 6 shown) is...

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 C Si mn Ni Cr Mo Cu Fe upper limit 0.18 0.15 0.10 2.50 1.40 0.35 0.25 Rest lower limit 0.13 0.38 0.40 3.50 1.80 0.60 0.25 Rest

[0107] First, model the austenitization process of the 300mm*120mm two-dimensional slab in the finite element general software, input the thermophysical paramete...

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Abstract

The invention relates to a method for measuring austenitization in the heat treatment process of metal materials, which belongs to the technical field of multi-field coupling numerical simulation, and is used to solve the problem that the existing numerical simulation cannot obtain the experimental data of the thermal physical properties of the material at the high temperature stage and does not consider changing the material composition The technical problem of the influence of phase change and thermal physical parameter difference on the calculation results of multi-field coupling. The method comprises the following steps: S1. Establishing a method for obtaining the phase transition and thermophysical parameters of the material for the composition and temperature of the metal material; S2. Establishing a finite element model for thermomechanical coupling calculation or heat transfer calculation of the temperature field-stress field; S3 . Calculating the temperature field or thermal stress of the metal material; S4. Obtaining the distribution of the temperature field and thermal stress of the metal material over time; S5. Obtaining the austenitization measurement results during the heat treatment of the metal material. This method takes into account the influence of composition on thermophysical parameters and phase transformation stress, and can accurately calculate the influence of phase transformation on temperature field and residual stress, which can be used to optimize 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 Patents(China)
IPC IPC(8): G06F30/23G06F119/14G06F119/08
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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