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GB/T 21838.1-2019Metallic materials -- Instrumented indentation test for hardness and materials parameters -- Part 1: Test method (English PDF)

金属材料硬度和材料参数的仪器化压入试验第1部分：试验方法

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Issued by

State Administration for Market Regulation, China National Standardization Administration

Level / Type

National · Recommended

Issue date

August 30, 2019

Implementation date

July 1, 2020

Scope

GB/T 21838.1-2019 is the English-translated version of 金属材料硬度和材料参数的仪器化压入试验第1部分：试验方法.

GB/T 21838.1-2019 is the Chinese standard "Metallic materials -- Instrumented indentation test for hardness and materials parameters -- Part 1: Test method".

Its scope clause reads: This part of GB/T 21838 specifies the following three ranges of metal materials instrumented indentation test method for the determination of hardness and other materials Number method. --- Macro range.

2N <= F <= 30kN; ---Microscopic range. F < 2N, h> 0.2 µm; ---Nano range. h <= 0.2 µm. For the nanometer range, the mechanical deformation is heavily dependent on the actual shape of the tip of the indenter, and the function of the contact area of the indenter used in the testing machine will be severely affected.

The calculation of the material parameters. Therefore, in order to make the reproducibility of the material parameters measured by different instruments within an acceptable range, a careful calibrator is required, and indenter shape.

The macroscopic and microscopic ranges are distinguished by the magnitude of the test force relative to the depth of penetration. Note that the upper limit of the microscopic range is expressed by the test force (2N), and the lower limit is expressed by the penetration depth (0.2 µm).

See Appendix A for the determination of hardness and other material parameters. Carbide indenters are usually used in the macro range because the head is easily damaged when the contact pressure is high.

For detecting hardness values and elastic modulus For higher samples, the standard block can be used to detect the permanent deformation that can be generated by the indenter, and the permanent deformation of the indenter should be considered.

Impact. This section can also be applied to thin metallic and non-metallic coverings as well as non-metallic materials. In this case, it is advisable to refer to the relevant standards. (See 6.3 and ISO 14577-4). Its clauses include symbols and instructions.

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Document preview — GB/T 21838.1-2019

National Standard of the People's Republic of China

ICS: 77.040.10
Classification: H 22
Replacing: GB/T 21838.1-2008

Issued by: State Administration for Market Regulation, China National Standardization Administration

Foreword
Introduction
1 Scope
2 Normative references
3 symbols and descriptions
4 Test principle
5 testing machine
6 sample
7 Test procedure
8 Uncertainty of test results
9 Test report
Appendix A (Normative Appendix) Determination of material parameters based on test force-indentation depth data
Appendix B (informative) The control method used to press the test process
Appendix C (Normative) Test Machine Flexibility and Head Area Function
Appendix D (informative) Notes on diamond indenters
Appendix E (Normative Appendix) Effect of surface roughness of test specimens on the accuracy of test results
Appendix F (informative) Conversion of hardness HIT and Vickers hardness HV
Appendix G (Normative Appendix) Determination of Drift Rate and Creep Rate
Appendix H (informative) Assessment of the uncertainty of hardness and material parameter values
Appendix I (Normative Appendix) Correction Calculation of Radial Displacement

1 Scope

This part of GB/T 21838 specifies the following three ranges of metal materials instrumented indentation test method for the determination of hardness and other materials

Number method.

--- Macro range. 2N <= F <= 30kN;

---Microscopic range. F < 2N, h> 0.2 µm;

---Nano range. h <= 0.2 µm.

For the nanometer range, the mechanical deformation is heavily dependent on the actual shape of the tip of the indenter, and the function of the contact area of the indenter used in the testing machine will be severely affected.

And indenter shape.

The macroscopic and microscopic ranges are distinguished by the magnitude of the test force relative to the depth of penetration.

Note that the upper limit of the microscopic range is expressed by the test force (2N), and the lower limit is expressed by the penetration depth (0.2 µm).

See Appendix A for the determination of hardness and other material parameters.

Carbide indenters are usually used in the macro range because the head is easily damaged when the contact pressure is high. For detecting hardness values and elastic modulus

For higher samples, the standard block can be used to detect the permanent deformation that can be generated by the indenter, and the permanent deformation of the indenter should be considered.

Impact.

This section can also be applied to thin metallic and non-metallic coverings as well as non-metallic materials. In this case, it is advisable to refer to the relevant standards.

(See 6.3 and ISO 14577-4).

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.

Pieces. For undated references, the latest edition (including all amendments) applies to this document.

ISO 14577-2.2015. Indentation test for hardness and material parameters of metallic materials - Part 2. Examination and testing of test machines

Calibration (Metalicmaterials-Instrumentedindentationtestforhardnessandmaterialsparameters-Part

2. Verification andcalibrationoftestingmachines)

ISO /IEC Guide 98-3.2008 (GUM.1995) Measurement uncertainty - Part 3. Guide to measurement uncertainty

[Uncertaintyofmeasurement-Part 3. Guidetotheexpressionofuncertaintyin measurement (GUM..1995)]

3 symbols and instructions

The symbols used in this section and the corresponding descriptions are shown in Table 1, Figure 1 and Figure 2.

GB/T 24174 | GB/T 22565.1 | GB/T 24173 | GB/T 21838.5 | GB/T 21838.3 | GB/T 21838.2 | […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 64 pages — is available in the English PDF.

Referenced standards

Normative references

ISO 14577

Cited by

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