The engineering function of many PM parts may require an exterior portion of the part to have a hardened layer. Where case hardening produces a distinct transition in the microstructure, metallographic estimation of the observed case depth may be used to check the depth to which the surface has been hardened.

1. Scope

1.1 A metallographic method is described for estimating the observed case depth of ferrous powder metallurgy (PM) parts. This method may be used for all types of hardened cases where there is a discernible difference between the microstructure of the hardened surface and that of the interior of the part.

1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

B243 Terminology of Powder Metallurgy

E407 Practice for Microetching Metals and Alloys

Keywords

case depth; observed case depth; PM; powder metallurgy; Ferrous metals/alloys; Metallographic analysis/inspection; Observed case depth; Powder metallurgy (P/M) materials;

ICS Code

ICS Number Code 77.160 (Powder metallurgy)

Citing ASTM Standards

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