Microstructure Evolution during Quenching and Tempering of Martensite in a Medium C Steel

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The microstructural evolution of a quenched medium-C steel during tempering was analyzed by means of Orientation Imaging Microscopy (OIM). The steel was heat treated in order to develop fully martensitic microstructures after quenching with a different prior austenite grain size (AGS). Main results can be summarized as below: A very poor effect of AGS on packet size was found in comparison to bainitic steels. A finer packet was measured at mid-thickness with respect to surface after the quenching process. This phenomenon was attributed to the effect of thermal strain path on phase transformation during quenching. The through-thickness microstructural gradient remains after tempering. High-angle boundary grains do not significantly grow after tempering; on the contrary, low-angle grain boundaries (cells) move, fully justifying the hardness evolution with tempering temperature.

Info:

Periodical:

Materials Science Forum (Volumes 715-716)

Edited by:

E.J. Palmiere and B.P. Wynne

Pages:

860-865

DOI:

10.4028/www.scientific.net/MSF.715-716.860

Citation:

A. di Schino et al., "Microstructure Evolution during Quenching and Tempering of Martensite in a Medium C Steel", Materials Science Forum, Vols. 715-716, pp. 860-865, 2012

Online since:

April 2012

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$35.00

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