ISO 643:2012
Steels — Micrographic determination of the apparent grain size
ISO 643:2012 specifies a micrographic method of determining apparent ferritic or austenitic grain size in steels. It describes the methods of revealing grain boundaries and of estimating the mean grain size of specimens with unimodal size distribution. Although grains are three-dimensional in shape, the metallographic sectioning plane can cut through a grain at any point from a grain corner, to the maximum diameter of the grain, thus producing a range of apparent grain sizes on the two-dimensional plane, even in a sample with a perfectly consistent grain size.
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Scope
Normative references
Terms and definitions
Symbols and abbreviated terms
Principle
Selection and preparation of the specimen
Test location
Revealing ferritic grain boundaries
Revealing austenitic and prior-austenitic grain boundaries
General
“Bechet-Beaujard” method by etching with aqueous saturated p
Field of application
Preparation
Polishing and etching
Result
“Kohn” method by controlled oxidation
Field of application
Preparation
Result
“McQuaid-Ehn” method by carburization at 925 °C
Field of application
Preparation
Specimen preparation
Result
Proeutectoid ferrite method
Principle
Preparation
Polishing and etching
Bainite or gradient-quench method
Principle
Preparation
Sensitization of austenitic stainless and manganese steels
Other methods for revealing prior-austenitic grain boundarie
Characterization of grain size
Characterization by an index
Formulae
Assessment by comparison with standard grain size charts
Planimetric method
Estimation of the index
Characterization by the intercept method
Linear intercept segment method
Circular intercept segment method
Assessment of results
Test report
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Scope
Normative references
Terms and definitions
Symbols and abbreviated terms
Principle
Selection and preparation of the specimen
Test location
Revealing ferritic grain boundaries
Revealing austenitic and prior-austenitic grain boundaries
General
“Bechet-Beaujard” method by etching with aqueous saturated p
Field of application
Preparation
Polishing and etching
Result
“Kohn” method by controlled oxidation
Field of application
Preparation
Result
“McQuaid-Ehn” method by carburization at 925 °C
Field of application
Preparation
Specimen preparation
Result
Proeutectoid ferrite method
Principle
Preparation
Polishing and etching
Bainite or gradient-quench method
Principle
Preparation
Sensitization of austenitic stainless and manganese steels
Other methods for revealing prior-austenitic grain boundarie
Characterization of grain size
Characterization by an index
Formulae
Assessment by comparison with standard grain size charts
Planimetric method
Estimation of the index
Characterization by the intercept method
Linear intercept segment method
Circular intercept segment method
Assessment of results
Test report