Method and system for characterization of martensitic transformation strength increment in phase transformation-induced plasticity steel

A technology of transformation-induced plasticity and martensitic transformation, applied in the field of mechanical properties to solve the problem of quantitative characterization

Active Publication Date: 2020-05-22
济宁市龙浩钢管制造有限公司
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Problems solved by technology

[0004] Based on this, it is necessary to provide a method and system for the characterization of the strength increment of the martensitic transformation of the phase transformation induced plasticity steel to solve the problem of quantitative characterization of the strength increment induced by the TRIP effect

Method used

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  • Method and system for characterization of martensitic transformation strength increment in phase transformation-induced plasticity steel
  • Method and system for characterization of martensitic transformation strength increment in phase transformation-induced plasticity steel
  • Method and system for characterization of martensitic transformation strength increment in phase transformation-induced plasticity steel

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Embodiment 2

[0073] ① Explore M d value. m d The value is the critical deformation temperature of the martensite transformation of the transformation-induced plasticity steel in the process of uniaxial stretching. When the deformation temperature is lower than this temperature value, the material will experience different degrees of TRIP effect (the stress caused by the martensitic transformation The value rises twice); when the deformation temperature is higher than this temperature value, the TRIP effect of the material disappears, and no phase change occurs at this time. This critical value (generally not higher than 100°C) can be obtained by carrying out a series of high-temperature tensile tests with different deformation temperatures (in this embodiment, the strain rate is all 0.001s -1 ) to obtain the high-temperature tensile engineering stress-strain curve of phase transformation-induced plasticity steel, such as figure 2 shown. Depend on figure 2 It can be seen that the cri...

Embodiment 3

[0088] This example provides a characterization system for the strength increment of the martensitic phase transformation of the phase transformation-induced plasticity steel, Figure 9 It is a schematic structural diagram of the characterization system for the strength increment of the martensitic transformation of the transformation-induced plasticity steel in Example 3 of the present invention.

[0089] see Figure 9 , the phase transformation-induced plasticity steel martensitic transformation strength increment characterization system of this embodiment includes:

[0090] The first curve determination module 901 is used to determine the first tensile engineering stress-strain curve; the first tensile engineering stress-strain curve is the relationship between the tensile deformation and the stress of the phase transformation induced plastic steel at the first preset temperature Relational curve; the first preset temperature is room temperature.

[0091] The second curve...

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Abstract

The invention discloses a method and a system for characterizing the strength increment of the martensitic phase transformation of the phase transformation-induced plasticity steel. The method comprises: stretching the phase change induced plastic steel with different deformation amounts at room temperature to obtain a martensite content-tensile deformation curve; performing different deformations on the phase change induced plastic steel at a second preset temperature amount of pre-deformation; the second preset temperature is a temperature value greater than or equal to the critical deformation temperature; at room temperature, the phase transformation induced plasticity steel after each pre-deformation is subjected to secondary stretching to obtain the secondary tensile engineering stress-strain curve; determine the subsequent yield stress corresponding to each secondary tensile engineering stress-strain curve; determine the strength increment caused by the martensitic transformation; the strength increment caused by the martensitic transformation and the martensite content-tensile deformation curve , to establish a strength increment prediction model to realize the quantitative characterization of the strength increment caused by martensitic transformation. The invention solves the quantitative characterization problem of the strength increment caused by the plastic effect induced by the phase change.

Description

technical field [0001] The invention relates to the technical field of mechanical properties, in particular to a method and system for characterization of martensitic phase transformation strength increment of phase transformation-induced plasticity steel. Background technique [0002] With the development of science and technology and the progress of society, traditional austenitic steel can no longer meet people's demand for high strength and high plasticity of structural parts. Therefore, Transformation Induce Plasticity (TRIP) steel came into being. In TRIP steel, the residual austenite in the steel plate induces martensite nucleation under the action of plastic deformation through the transformation-induced plasticity (TRIP) effect. The TRIP effect occurs when the material is plastically deformed, and it is a macroscopic appearance of the transformation from metastable austenite to martensite. This phase transformation accompanied by local plastic strain, on the one ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08G06F30/20G06Q10/04
CPCG01N3/08G06Q10/04G01N2203/0017G01N2203/0075G01N2203/0641G01N2203/0676G06F2113/22G06F2111/10G06F30/20
Inventor 陈雷郝硕彭程贾祺祥梅瑞雪
Owner 济宁市龙浩钢管制造有限公司
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