Browse Standards ARP1820
Historical ISSUED 1984-10-01

CHORD METHOD OF EVALUATING SURFACE MICROSTRUCTURAL CHARACTERISTICS ARP1820

This practice provides a method of evaluating microhardness and microstructure very close to the surface. It is useful for process control in heat treatment of steel parts to detect nitriding and carburization as well as decarburization and excessive intergranular oxidation. It also may be valuable for other evaluations, e.g., plated coatings and other materials.
ARP1820C
2021-05-19
Latest
Revised
ARP1820B
2012-04-05
Historical
Reaffirmed
ARP1820A
2002-12-20
Historical
Reaffirmed
ARP1820
1984-10-01
Historical
Issued

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