Method for constructing high-temperature plastic flow densification constitutive models of powder sintering materials

A technology of sintered materials and constitutive models, applied in design optimization/simulation, special data processing applications, instruments, etc., to achieve good stability

Active Publication Date: 2017-02-08
江苏开来钢管有限公司
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  • Abstract
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Problems solved by technology

[0004] In view of this, the present invention provides a powder sintering powder sintered Construction method of high temperature plastic rheological densification constitutive model of materials

Method used

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  • Method for constructing high-temperature plastic flow densification constitutive models of powder sintering materials
  • Method for constructing high-temperature plastic flow densification constitutive models of powder sintering materials
  • Method for constructing high-temperature plastic flow densification constitutive models of powder sintering materials

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Effect test

Embodiment 1

[0067] Prediction of flow stress and instantaneous density and stability analysis of FC0205 powder sintered alloy steel during thermal processing. For powder sintered alloy steel samples with typical components for powder metallurgy parts, combined with thermodynamic calculations and thermal processing conditions, the range of thermal processing parameters is obtained: processing temperature 850-1000 ° C; processing strain rate 0.01-10s -1 , design the thermal simulation experiment as follows:

[0068] Initial sintering density 0.80; deformation temperature (°C): 850, 900, 950, 1000; strain rate (s -1 ): 0.01, 0.1, 1.0, 10.

[0069] The experimental results were processed according to the above constitutive model, and the material characteristic parameters of the constitutive model for high temperature plastic rheological densification of FC0205 powder sintered alloy steel were obtained (see Table 1). By substituting the material characteristic parameters in Table 1 into the...

Embodiment 2

[0073] Prediction of flow stress and instantaneous density and stability analysis of F0005 powder sintered steel during thermal processing. For the powder sintered steel sample with typical components for powder metallurgy parts, combined with thermodynamic calculations and thermal processing conditions, the range of thermal processing parameters is obtained: processing temperature 850-950°C; processing strain rate 0.01-10s -1 , design the thermal simulation experiment as follows:

[0074] Initial sintering density 0.80; deformation temperature (℃): 850,880,910,940; strain rate (s -1 ): 0.01, 0.1, 1.0, 10.

[0075] The experimental results were processed according to the above constitutive model, and the material characteristic parameters of the constitutive model for high temperature plastic rheological densification of F0005 powder sintered steel were obtained (see Table 2). By substituting the material characteristic parameters in Table 2 into the nonlinear constitutive r...

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Abstract

The invention discloses a method for constructing high-temperature plastic flow densification constitutive models of powder sintering materials. The method comprises a step of carrying out numerical fitting analysis by taking the flow stress and instant density data of a powder sintering material as basis, so as to establish a nonlinear constitutive relationship model among a high-temperature flow stress sigma, an instant density rho, a deformation temperature T and a strain rate xi of the powder sintering material. The model is suitable for the plastic processing technologies such as hot rolling, hot extrusion, hot forging and the like of powder sintering bodies with ingredients of pure iron, carbon steel and alloy steel and suitable for the mould design; and the model not only can accurately represent the high-temperature plastic flow densification behaviors of the powder sintering materials, but also can accurately predict the flow stresses and instant densities of the powder sintering materials under different hot processing conditions, has favorable stability and can be applied to the plastic processing technologies such as hot rolling, hot extrusion, hot forging and the like of powder sintering materials and the computer-assisted design of moulds.

Description

technical field [0001] The invention belongs to the field of high-temperature plastic processing engineering of powder sintered materials, in particular to a high-temperature powder sintered material suitable for hot rolling, hot extrusion, hot forging technology and mold design of pure iron, carbon steel, and alloy steel powder sintered bodies. Construction method of plastic rheological densification constitutive model. Background technique [0002] The constitutive model is a mathematical model that describes the dependence of material flow stress and strain, strain rate and deformation temperature, reflects the basic information of material deformation, and is a material processing technology (including rolling, extrusion, forging, etc.) and mold computer aided necessary basis for design. Due to the existence of pores, the high-temperature plastic deformation behavior of powder sintered materials is different from that of traditional cast-forged materials. Densification ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 郭彪敖进清
Owner 江苏开来钢管有限公司
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