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This research is to determine retained austenite content in AISI 52100 steel specimens which were hardened and tempered, by X-ray diffractometer. Steels were austenitized in temperature range of 800°C to 900°C, then quenched in oil and tempered. Microstructure of specimens comprises martensite, spheroidized cementite and retained austenite. However, microstructure showed Ghost line when etched with nital solution. The etchant which showed cementite clearly was used to determine volume fraction of cementite. X-ray diffractometer with chromium target provides the ratio of volume fraction martensite and austenite. When volume fraction of cementite is known, the amount of retained austenite can be calculated. Austenitizing temperatures of 800, 815, 845, 860 and 900°C result in the amounts of retained austenite of 5.3, 6.3, 9.9, 13.3 and 20.1% respectively.

DETERMINING THE AMOUNT OF RETAINED IN AISI 52100 STEEL USING X-RAY DIFFRACTION