The martensite microstructure,amount of retained austenite and its carbon concentration inthe 40CrNiMo steel quenched at various conditions have been investigated by using trans-mission Mossbauer spectroscopy at room temperature.It was shown that high-temperaturequenching and thermomechanical quenching has little influence on amount of retainedaustenite,thus the toughening effect of quenching was attributed to bulk lath martensite andits refining.
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