Standard Test Method for X-Ray Determination of Retained Austenite in Steel with Near Random Crystallographic Orientation

Importancia y uso:

2.1 Significance—Retained austenite with a near random crystallographic orientation is found in the microstructure of heat-treated low-alloy, high-strength steels that have medium (0.40 weight %) or higher carbon contents. Although the presence of retained austenite may not be evident in the microstructure, and may not affect the bulk mechanical properties such as hardness of the steel, the transformation of retained austenite to martensite during service can affect the performance of the steel.

2.2 Use—The measurement of retained austenite can be included in low-alloy steel development programs to determine its effect on mechanical properties. Retained austenite can be measured on a companion specimen or test section that is included in a heat-treated lot of steel as part of a quality control practice. The measurement of retained austenite in steels from service can be included in studies of material performance.

Subcomité:

E04.11

Volúmen:

03.01

Número ICS:

77.040.99 (Other methods of testing of metals), 77.080.20 (Steels)

Palabras clave:

austenite; crystallographic orientation; ferrite; martensite; retained austenite; X-ray diffraction ;