A Method of Optimizing Alloy Extrusion Process

A technology of alloys and processes, applied in design optimization/simulation, instruments, calculations, etc., can solve problems such as failure to utilize equipment, waste of resources, failure, etc.

Active Publication Date: 2021-01-29
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as mentioned above, there are many parameters that affect extrusion, and there are mutual influences. It is impossible to achieve the desired effect through a limited number of experiments, and it will lead to the failure of many experiments; waste; therefore, there are problems such as the pursuit of smooth extrusion and having to choose a safer extrusion process, resulting in poor performance of the extruded product and so on

Method used

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  • A Method of Optimizing Alloy Extrusion Process
  • A Method of Optimizing Alloy Extrusion Process
  • A Method of Optimizing Alloy Extrusion Process

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0075] Taking nickel-based superalloy as an example, follow the steps below

[0076] Step 1 Establish the constitutive equation of the alloy to be extruded (nickel-based superalloy)

[0077] Select 5 values ​​between 1040-1160°C; these five values ​​are 1040°C, 1070°C, 1100°C, 1130°C, 1160°C;

[0078] At a strain rate of 0.0001-100s -1 Select 5 point values ​​between; 5 point values ​​are 0.001s -1 、0.01s -1 , 0.1s -1 、1s -1 、10s -1 ;

[0079] Under the restriction of selected temperature and strain rate, carry out extrusion experiment; Collect stress-strain data, and construct hyperbolic sine type Arrhenius equation according to the stress-strain data collected; The expression of described hyperbolic sine type Arrhenius equation The formula is:

[0080]

[0081] In formula (1.1),

[0082] is the strain rate, and its unit is s -1 ;

[0083] T is the average temperature of the extruded billet, and its unit is K;

[0084] R is the molar gas constant, with a valu...

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Abstract

The invention relates to a method for optimizing an alloy extrusion process, in particular to an optimization method for a powder metallurgy alloy hot extrusion process, and belongs to the field of plastic processing. The present invention first establishes the constitutive equation of the alloy to be extruded, and then imports it into the solid mechanics finite element software according to the constitutive equation, carries out the simulation of the extrusion test through the test design method and analyzes the results, and finally uses statistical analysis and Through optimization analysis, the influence of each factor on the extrusion process can be obtained, and the optimization of each parameter of the extrusion process can be realized. After obtaining the highly reliable constitutive equation through reasonable and limited experiments, the present invention introduces the constitutive equation into the simulation analysis of solid mechanics finite element analysis software and the statistical optimization results of statistical analysis software, and establishes an optimized alloy extrusion process The method has obtained reasonable and practical optimization parameters, and has been verified by practice.

Description

technical field [0001] The invention relates to a method for optimizing an alloy extrusion process, in particular to an optimization method for a powder metallurgy alloy hot extrusion process, and belongs to the field of plastic processing. Background technique [0002] Powdered nickel-based superalloy has the advantages of uniform structure, no macro-segregation, high degree of alloying, high yield strength, good oxidation resistance and fatigue performance, so it is one of the commonly used materials for thermal structural components. Refining the grains by extrusion not only provides the organization basis for the subsequent isothermal forging and superplastic forging, but also an effective means to improve the mechanical properties of the alloy. [0003] The hot extrusion process parameters of powdered nickel-based superalloy mainly involve extrusion ratio, extrusion rate, extrusion temperature, friction factor, working belt length, mold temperature, and mold cone angle,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/23G06F119/18G06F119/14
CPCG06F30/20G06F2119/18
Inventor 不公告发明人
Owner CENT SOUTH UNIV
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