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Method for quickly determining metal material strain hardening index

A strain hardening index and strain hardening technology, applied in the direction of applying stable tension/pressure to test the strength of materials, etc., can solve the problems of error-prone and heavy workload, and achieve the effect of easy operation and high efficiency

Inactive Publication Date: 2012-06-20
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is also a method of gradual approximation using recursion, but the workload is heavy, error-prone, and usually requires computer assistance

Method used

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  • Method for quickly determining metal material strain hardening index
  • Method for quickly determining metal material strain hardening index

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The strain hardening exponent of a medium-carbon low-alloy steel obtained by normalizing is determined, and its microstructure is ferrite+pearlite.

[0035] A method for quickly determining the strain hardening exponent of a metal material, comprising the steps of:

[0036] First, draw the tensile curve σ-ε according to the tensile test data;

[0037] Second, determine the "starting point of strain hardening" on the tensile curve drawn in the previous step

[0038] Because the material has an obvious yield point, the point at which the stress begins to rise monotonously after the material yields is taken as the "starting point of strain hardening", and the corresponding strain of this starting point is 0.0055;

[0039] Third, determine the "end point of strain hardening" on the tensile curve drawn in the first step

[0040] The stress reaches the maximum value σ max The corresponding point is "the end point of strain hardening", and the strain corresponding to the en...

Embodiment 2

[0051] The strain hardening index of a medium-carbon low-alloy steel obtained by first quenching and then tempering is determined, and its structure is ferrite + upper bainite + tempered sorbite.

[0052] A method for quickly determining the strain hardening exponent of a metallic material comprises the following steps:

[0053] First, draw the tensile curve σ-ε according to the tensile test data;

[0054] Second, determine the "starting point of strain hardening" on the tensile curve drawn in the previous step

[0055] Because the material has an obvious yield point, the point at which the stress begins to rise monotonously after the material yields is taken as the "starting point of strain hardening", and the strain corresponding to the starting point is 0.01026;

[0056] Third, determine the "end point of strain hardening" on the tensile curve drawn in the second step

[0057] The stress reaches the maximum value σ max The corresponding point is "the end point of strain ...

Embodiment 3

[0068] The strain hardening exponent of a quenched and then tempered medium carbon low alloy steel is determined, and its microstructure is complete martensite.

[0069] A method for quickly determining the strain hardening exponent of a metal material, comprising the steps of:

[0070] First, draw the tensile curve σ-ε according to the tensile test data;

[0071] Second, determine the "starting point of strain hardening" on the tensile curve drawn in the previous step

[0072] Because the material has an obvious yield point, the point at which the stress begins to rise monotonously after the material yields is taken as the "starting point of strain hardening", and the corresponding strain of the starting point is 0.01202;

[0073] Third, determine the "end point of strain hardening" on the tensile curve drawn in the second step

[0074] The stress reaches the maximum value σ max The corresponding point is "the end point of strain hardening", and the strain corresponding to...

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Abstract

The invention relates to a method for quickly determining a metal material strain hardening index. The method comprises the following steps of: first, according to the tension test data, drawing a tension curve sigma-epsilon; second, determining a starting point for generating strain hardening effect; third, determining an end point for generating strain hardening effect; fourth, determining two key points: namely (epsilon1, sigma1) and (epsilon2, sigma2) on the tension curve; and fifth, according to a formula, calculating the strain hardening index. The method provided by the invention has the characteristics of easy operation, high efficiency and no influence of human factors.

Description

technical field [0001] The invention relates to a method for determining the index of a metal material, in particular to a method for quickly determining the strain hardening index of a metal material, which is mainly used in various iron and steel materials. Background technique [0002] The strain hardening exponent value can be used as a parameter to measure the strain hardening ability of the plastic deformation stage when the material is stretched, reflecting the strain hardening of the material when it continues to deform after the material begins to yield. Its size not only determines the stamping performance of the material, but also determines the strength of the machine parts to withstand accidental overload, because a larger strain hardening index value can prevent some weak parts of the machine from continuing to plastically deform, thereby ensuring the machine parts Safe service. The hardening index is not only of great value in engineering, but also has a quan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08
Inventor 许天旱
Owner XI'AN PETROLEUM UNIVERSITY
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