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Method for determining maximum strain hardening exponent according to strength of steel-iron material

A hardening index, maximum strain technique used to test material strength and other directions using a stable tension/compression applied

Inactive Publication Date: 2012-08-08
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no method to determine the maximum hardening exponent according to the strength of steel materials

Method used

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  • Method for determining maximum strain hardening exponent according to strength of steel-iron material
  • Method for determining maximum strain hardening exponent according to strength of steel-iron material
  • Method for determining maximum strain hardening exponent according to strength of steel-iron material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] For a medium-carbon low-alloy steel obtained by normalizing, the structure is ferrite + pearlite, including the following steps:

[0084] First, the formula between the yield strength and tensile strength of the steel material and the maximum strain hardening exponent is firstly deduced. The specific operation is:

[0085] The hardened strength of a material can be determined by the Hollomon relation:

[0086] (1)

[0087] In the formula:

[0088] S ——true stress / MPa;

[0089] K ——intensification coefficient / MPa;

[0090] e ——True strain;

[0091] n - strain hardening exponent;

[0092] because n The generalized mechanical definition of the value refers to the sensitivity of deformation stress to strain at any instant in tensile deformation, n The geometric meaning of the value is the slope of the strain hardening curve on the stress-strain logarithmic coordinate plane;

[0093] (2)

[0094] For the data collected by the computer during the tensi...

Embodiment 2

[0162] For a medium-carbon low-alloy steel obtained by quenching and then tempering, the structure is ferrite + upper bainite + tempered sorbite, including the following steps:

[0163] First, the formula between the yield strength and tensile strength of the steel material and the maximum strain hardening exponent is firstly deduced. The specific operation is:

[0164] The hardened strength of a material can be determined by the Hollomon relation:

[0165] (1)

[0166] In the formula:

[0167] S ——true stress / MPa;

[0168] K ——intensification coefficient / MPa;

[0169] e ——True strain;

[0170] n - strain hardening exponent;

[0171] because n The generalized mechanical definition of the value refers to the sensitivity of deformation stress to strain at any instant in tensile deformation, n The geometric meaning of the value is the slope of the strain hardening curve on the stress-strain logarithmic coordinate plane;

[0172] (2)

[0173] For the data c...

Embodiment 3

[0241] For a medium-carbon low-alloy steel that is first quenched and then tempered, the structure is complete martensite, including the following steps:

[0242] First, the formula between the yield strength and tensile strength of the steel material and the maximum strain hardening exponent is firstly deduced. The specific operation is:

[0243] The hardened strength of a material can be determined by the Hollomon relation:

[0244] (1)

[0245] In the formula:

[0246] S ——true stress / MPa;

[0247] K ——intensification coefficient / MPa;

[0248] e ——True strain;

[0249] n - strain hardening exponent.

[0250] because n The generalized mechanical definition of the value refers to the sensitivity of deformation stress to strain at any instant in tensile deformation, n The geometric meaning of the value is the slope of the strain hardening curve on the stress-strain logarithmic coordinate plane;

[0251] (2)

[0252] For the data collected by the compute...

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Abstract

The invention discloses a method for determining the maximum strain hardening exponent according to the strength of a steel-iron material. The method comprises the following steps of: I, deducing a formula among the yield strength, tensile strength and maximum strain hardening exponent of the steel-iron material; II, determining the yield strength and tensile strength of the steel-iron material to be detected; and III, calculating the maximum strain hardening exponent of the steel-iron material according to the formula deduced in the step I. The method has the characteristic of quick, convenient and accurate acquisition of the maximum strain hardening exponent according to the strength of the steel-iron material.

Description

technical field [0001] The invention relates to a method for determining the hardening index of a steel material, in particular to a method for determining the maximum strain hardening index according to the strength of the steel material. Background technique [0002] Casing drilling technology, as a new economical drilling method, has changed the traditional operation method. Therefore, the performance requirements of the material are not only different from the performance requirements of the casing used in the past cementing, but also different from the performance of the drill pipe used in the past. Require. In addition to bearing static loads, materials are required to have high yield strength and tensile strength while bearing dynamic loads, and must have a high enough resistance to strain fatigue, especially for environments with variable geological structures, such as rocks and clay layers etc. Therefore, it is required that the material has a high enough strain ha...

Claims

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Application Information

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IPC IPC(8): G01N3/08
Inventor 许天旱
Owner XI'AN PETROLEUM UNIVERSITY
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