Measurement method of retained austenite content in high nickel alloy steel

A technology of retained austenite and measurement method, applied in the field of measurement of retained austenite content in high-nickel alloy steel, can solve problems such as uneconomical measurement equipment and measurement costs, and achieve saving measurement costs, high speed, and improved measurement. The effect of efficiency

Active Publication Date: 2019-01-01
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The current method of measuring the retained austenite content in iron and steel materials generally uses X-ray analysis technology, but this measurement technology is often uneconomical in terms of measurement equipment and measurement costs

Method used

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  • Measurement method of retained austenite content in high nickel alloy steel
  • Measurement method of retained austenite content in high nickel alloy steel
  • Measurement method of retained austenite content in high nickel alloy steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 1) Select 3 high-nickel alloy steel standard samples, and the residual austenite content R in the 3 high-nickel alloy steel standard samples a are not the same;

[0016] 2) Using X-ray analysis technology and using a tensile testing machine to measure the residual austenite content R in each high-nickel alloy steel standard sample in step 1) a and tensile strength Rm, three groups of retained austenite content R a And the data of tensile strength Rm, as shown in table 1;

[0017] Table 1

[0018]

[0019] 3) The data in Table 1 in step 2) is plotted on the coordinate axis, and the retained austenite content R a is the axis of abscissa, the tensile strength Rm is the axis of ordinate, according to the square of the correlation coefficient of the straight line fitting=0.990, the points in the coordinate axis are fitted to form a fitted straight line, and the fitted straight line equation Rm=-25.64R a +1427;

[0020] 4) Carry out the tensile test on the high-nickel...

Embodiment 2

[0022] 1) Select 4 high-nickel alloy steel standard samples, and the residual austenite content R in the 4 high-nickel alloy steel standard samples a are not the same;

[0023] 2) Using X-ray analysis technology and using a tensile testing machine to measure the residual austenite content R in each high-nickel alloy steel standard sample in step 1) a and tensile strength Rm, four groups of retained austenite content R a And the data of tensile strength Rm, as shown in table 2;

[0024] Table 2

[0025]

[0026] 3) The data in Table 2 in step 2) is plotted in the coordinate axis, and the retained austenite content R a is the axis of abscissa, the tensile strength Rm is the axis of ordinate, according to the square of the correlation coefficient of the straight line fitting=0.998, the points in the coordinate axis are fitted to form a fitted straight line, and the fitted straight line equation Rm=-24.85R is obtained a +1416;

[0027] 4) Carry out the tensile test on the ...

Embodiment 3

[0029] 1) Select 5 high-nickel alloy steel standard samples, and the residual austenite content R in the 5 high-nickel alloy steel standard samples a are not the same;

[0030] 2) Using X-ray analysis technology and using a tensile testing machine to measure the residual austenite content R in each high-nickel alloy steel standard sample in step 1) a and tensile strength Rm, 5 groups of retained austenite content R a And the data of tensile strength Rm, as shown in table 3;

[0031] table 3

[0032]

[0033] 3) The data in Table 1 in step 2) is plotted on the coordinate axis, and the retained austenite content R a is the axis of abscissa, the tensile strength Rm is the axis of ordinate, according to the square of the correlation coefficient of the straight line fitting=0.991, the points in the coordinate axis are fitted to form a fitted straight line, and the fitted straight line equation Rm=-25.48R a +1427;

[0034] 4) Carry out the tensile test on the high-nickel all...

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Abstract

The invention discloses a method for measuring the content of residual austenite in high-nickel alloy steel. The method comprises the following steps: selecting N high-nickel alloy steel standard samples; measuring the content of the residual austenite and the tensile strength of each high-nickel alloy steel standard sample by adopting an X-ray analysis technology and utilizing a tensile testing machine; drawing points about data of the content of the residual austenite and the tensile strength of N groups in a coordinate axis, fitting the points in the coordinate axis according to coefficients related to linear fitting, forming a fitting straight line, and obtaining a fitting straight line equation Rm=ARa+B; carrying out a tensile test on a high-nickel alloy steel test sample on the tensile testing machine, measuring the tensile strength, substituting the tensile strength in the fitting straight line equation Rm=ARa+B, and obtaining the content of the residual austenite. Aiming at the high-nickel alloy steel, the content of the residual austenite in the high-nickel alloy steel can be measured while the tensile strength of the high-nickel alloy steel is measured by adopting the tensile testing machine, two results can be obtained through one operation, and the measuring cost is reduced; the speed is fast, and the measuring efficiency is increased.

Description

technical field [0001] The invention belongs to the field of iron and steel material analysis, in particular to a method for measuring residual austenite content in high-nickel alloy steel. Background technique [0002] The current methods for measuring the retained austenite content in iron and steel materials generally use X-ray analysis technology, but this measurement technology is often uneconomical in terms of measurement equipment and measurement costs. [0003] Chinese invention patent application (publication number 102735703A, publication date 2012.10.17) discloses a method for quantitatively evaluating retained austenite in steel using EBSD, and introduces a method for quantitatively evaluating retained austenite in steel using EBSD. Scan the surface of the stress-removed sample to obtain the backscattered diffraction signal, find out the retained austenite and outline all the retained austenite grains, and then give the content of various forms of retained austen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08G01N3/06
CPCG01N3/06G01N3/08
Inventor 周顺兵姚中海周千学刘冬王志奋
Owner 武汉钢铁有限公司
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