Standard Test Methods for Estimating the Depth of Decarburization of Steel Specimens

Importancia y uso:

5.1 These test methods are used to detect surface losses in carbon content due to heating at elevated temperatures, as in hot working or heat treatment.

5.2 Results of such tests may be used to qualify material for shipment according to agreed upon guidelines between purchaser and manufacturer, for guidance as to machining allowances, or to assess the influence of processing upon decarburization tendency.

5.3 Screening tests are simple, fast, low-cost tests designed to separate non-decarburized samples from those with appreciable decarburization. Based on the results of such tests, the other procedures may be utilized as applicable.

5.4 Microscopical tests require a metallographically polished cross section to permit reasonably accurate determination of the depth and nature of the decarburization present. Several methods may be employed for estimation of the depth of decarburization. The statistical accuracy of each varies with the amount of effort expended.

5.5 Microindentation hardness methods are employed on polished cross sections and are most suitable for hardened specimens with reasonably uniform microstructures. This procedure can be used to define the depth to a specific minimum hardness or the depth to a uniform hardness.

5.6 Chemical analytical methods are limited to specimens with simple, uniform shapes and are based on analysis of incremental turnings or after milling at fixed increments.

5.7 Microscopical tests are generally satisfactory for determining the suitability of material for intended use, specification acceptance, manufacturing control, development, or research.

Subcomité:

E04.14

Referida por:

E0003-11R17, A0534-17R22, F2282-23, A0228_A0228M-18R24E01, A0485-17R22, B0874-96R23, A0756-17R22, E0003-11R17, A0866-18, B0848_B0848M-21, A0295_A0295M-14R20, A1125_A1125M-24, E0003-11R17, E0003-11R17

Volúmen:

03.01

Número ICS:

77.080.20 (Steels)

Palabras clave:

carbon content; complete decarburization; decarburization; ferrite; microindentation hardness; partial decarburization; steels; total decarburization;