Method estimating hot-working performance of metal material

A metal material and thermal processing technology, applied in the direction of applying stable tension/pressure to test the strength of materials, can solve problems such as narrow application range and difficulty in engineering application

Inactive Publication Date: 2016-06-08
CENT SOUTH UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for evaluating the thermal processing performance of metal materials, which solves the disadvantages of narrow application range and difficulty in engineering application of existing evaluation methods, and has important technical guiding significance for rationally formulating the thermal processing technology of metal materials

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  • Method estimating hot-working performance of metal material
  • Method estimating hot-working performance of metal material

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Embodiment Construction

[0028] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] The present invention is a method for evaluating the thermal processing performance of metal materials. Below, taking the evaluation of the thermal processing performance of GH4169 alloy (typical metal material) as an example, the specific implementation details of the evaluation method involved in the present invention are introduced in detail. The method includes:

[0030] Step 1: Conduct high-temperature compression experiments on GH4169 alloy, the deformation temperatures are 920°C, 950°C, 980°C, 1010°C and 1040°C, and the strain rates are 0.001s -1 、0.01s -1 , 0.1s -1 and 1s -1 , should be 1.2.

[0031] Step 2: Establish an improved hyperbolic sine constitutive model describing the high-temperature flow stress of GH4169 alloy, and implement it through programming;

[0032] Based on the true stress-true strain data measured by ...

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Abstract

The invention discloses a method estimating hot-working performance of a metal material. The method comprises the following steps: (1), subjecting the metal material to high-temperature compression testing under designed thermal deformation conditions so as to obtain tree-true strain data; (2), establishing a modified hyperbolic sine constitutive model for describing high-temperature flow stress of a metal material, through programming; (3), establishing a hot-working dissipation efficiency estimation model and an instability judging module of the metal material, through programming; (4), using a high temperature flow stress prediction model established in steps (2) and (3), hot-working dissipation efficiency estimation model and instability judging model to predict flow stress of the metal material, hot-working dissipation rate and instability coefficient under any condition so that hot-working performance of the metal material is comprehensively estimated under any deformation condition. The method enables the hot-working performance of the metal material to be accurately and quickly estimated, and significant technical guidance is provided for reasonable arrangement of the-working process of the metal material is reasonably formulated.

Description

Technical field: [0001] The invention belongs to the technical field of metal material processing engineering, in particular to a method for evaluating the thermal processing performance of metal materials. Background technique: [0002] During high-temperature deformation, the hot workability of metal materials is strongly affected by thermal deformation parameters (deformation temperature, strain rate, and strain, etc.); at the same time, high-temperature deformation leads to complex microstructure evolution (work hardening, dynamic recovery, etc.) of metal materials. , dynamic recrystallization and phase transformation and other evolution mechanisms) will also affect the thermal processing properties of metal materials. Based on the dynamic material model, Prasad et al. proposed a method to evaluate the thermal processing performance of metal materials under the ideal thermal deformation state of constant temperature and constant strain rate. In recent years, many resear...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/18
CPCG01N3/18
Inventor 蔺永诚温东旭
Owner CENT SOUTH UNIV
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