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Method for optimizing alloy extrusion process

An alloy and process technology, applied in the field of optimization of alloy extrusion process and hot extrusion process, can solve problems such as failure to use equipment, poor performance of extrusion products, waste of resources, etc.

Active Publication Date: 2017-09-01
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Method for optimizing alloy extrusion process
  • Method for optimizing alloy extrusion process
  • Method for optimizing alloy extrusion process

Examples

Experimental program
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Effect test

Embodiment 1

[0076] Taking nickel-based superalloy as an example, follow the steps below

[0077] Step 1 Establish the constitutive equation of the alloy to be extruded (nickel-based superalloy)

[0078] Select 5 values ​​between 1040-1160°C; these five values ​​are 1040°C, 1070°C, 1100°C, 1130°C, 1160°C;

[0079] 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 ;

[0080] 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:

[0081]

[0082] In formula (1.1),

[0083] is the strain rate, and its unit is s -1 ;

[0084] T is the average temperature of the extruded billet, and its unit is K;

[0085] 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, specifically to an optimization method for a hot extrusion process of powder metallurgical alloy, and belongs to the plastic processing field. According to the method, a constitutive equation of a to-be-extruded alloy is established firstly; next, according to the constitutive equation, the constitutive equation is imported to solid mechanical finite element software; simulation of an extrusion test and analysis of the result are performed through a test design method; and finally, by virtue of statistical analysis and optimization analysis, the influence value of each factor on the extrusion process is obtained, so as to realize optimization of each parameter of the extrusion process. By virtue of reasonable and finite tests, the constitutive equation with extremely high credibility can be obtained; then the constitutive equation is introduced into the statistical and optimization result of the statistical analysis and optimization analysis of the solid mechanical finite element software, and the method for optimizing the alloy extrusion process is established; and the reasonable and practical optimization parameters are obtained, and the method is proved by practices and verification.

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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IPC IPC(8): G06F17/50
CPCG06F30/20G06F2119/18
Inventor 不公告发明人
Owner CENT SOUTH UNIV
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