ISO 4545-1:2017
Metallic materials — Knoop hardness test — Part 1: Test method
ISO 4545-1:2017 specifies the Knoop hardness test method for metallic materials for test forces from 0,009 807 N to 19,613 N.
The Knoop hardness test is specified in this document for lengths of indentation diagonals ≥0,020 mm. Using this method to determine Knoop hardness from smaller indentations is outside the scope of this document as results would suffer from large uncertainties due to the limitations of optical measurement and imperfections in tip geometry. ISO 14577-1 allows the determination of hardness from smaller indentations.
A periodic verification method is specified for routine checking of the testing machine in service by the user.
Special considerations for Knoop testing of metallic coatings can be found in ISO 4516.
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Symbols and designations
5.1 Symbols and designations used in this document
5.2 Designation of hardness number
6 Testing machine
6.1 Testing machine
6.2 Indenter
6.3 Diagonal measuring system
7 Test piece
7.1 Test Surface
7.2 Preparation
7.3 Thickness
7.4 Support of unstable test pieces
8 Procedure
8.1 Test temperature
8.2 Test force
8.3 Periodic verification
8.4 Test piece support
8.5 Focus on test surface
8.6 Test force application
8.7 Prevention of the effect of shock or vibration
8.8 Minimum distance between adjacent indentations
8.9 Measurement of diagonal length
8.10 Calculation of hardness value
9 Uncertainty of the results
10 Test report
Annex A (normative) Procedure for periodic checking of the testing machine, diagonal measuring system and the indenter by the user
Annex B (informative) Uncertainty of the measured hardness values
Annex C (informative) Knoop hardness measurement traceability
Annex D (informative) CCM — Working group on hardness
Annex E (informative) Adjustment of Köhler illumination systems
Bibliography
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Symbols and designations
5.1 Symbols and designations used in this document
5.2 Designation of hardness number
6 Testing machine
6.1 Testing machine
6.2 Indenter
6.3 Diagonal measuring system
7 Test piece
7.1 Test Surface
7.2 Preparation
7.3 Thickness
7.4 Support of unstable test pieces
8 Procedure
8.1 Test temperature
8.2 Test force
8.3 Periodic verification
8.4 Test piece support
8.5 Focus on test surface
8.6 Test force application
8.7 Prevention of the effect of shock or vibration
8.8 Minimum distance between adjacent indentations
8.9 Measurement of diagonal length
8.10 Calculation of hardness value
9 Uncertainty of the results
10 Test report
Annex A (normative) Procedure for periodic checking of the testing machine, diagonal measuring system and the indenter by the user
Annex B (informative) Uncertainty of the measured hardness values
Annex C (informative) Knoop hardness measurement traceability
Annex D (informative) CCM — Working group on hardness
Annex E (informative) Adjustment of Köhler illumination systems
Bibliography