ASTM G79 PDF

ASTM G79 – Standard Practice for Evaluation of Metals Exposed to Carburization Environments (Withdrawn 2005)

1.1 This practice covers procedures for the identification and measurement of the extent of carburization in a metal sample and for the interpretation and evaluation of the effects of carburization. It applies mainly to iron- and nickel-based alloys for high temperature applications. Four methods are described. MethodA Total Mass Gain MethodB Metallographic Evaluation MethodC Carbon Diffusion Profile MethodD Change in Mechanical Properties

1.2 These methods are intended, within the interferences as noted for each, to evaluate either laboratory specimens or commercial product samples that have been exposed in either laboratory or commercially produced environments.

1.3 No attempt is made to recommend particular test exposure conditions, procedures, or specimen design as these may vary with the test objectives.

1.4 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.