Nosov Magnitogorsk State Technical University, Magnitogorsk, Russia:

V. M. Kolokoltsev, Dr. Eng., Prof., Rector
K. N. Vdovin, Dr. Eng., Prof., e-mail: kn.vdovin@gmail.com
D. A. Gorlenko, Cand. Eng., Assistant of Dept. of Foundry and Materials, e-mail: gorldima@yandex.ru
A. E. Gulin, Cand. Eng., Assistant Prof., Dept. of Material Processing Technologies

The paper presents the relationship between the value of the stacking fault energy of Hadfield steel and the cooling rate of the casting. An scanning electron Х-ray spectral electron microanalysis was used to show that the rate of cooling influences the alloying of austenite with manganese, chromium and silicon. This influence is reflected by the non-monotone change of the stacking fault energy with the maximum value at cooling rates of 110–240 °С/min. At these values of the cooling rate, the value of the stacking fault energy exceeds 48 mJ/m², resulting in the qualitative change of the deformation mechanism from twinning (twinning-induced plasticity) to dislocation sliding (sliding-induced plasticity). The latter mechanism is characterized by the minimum thickness and abrasive wear resistance of the hardened layer formed on the wearing surface. The alloys cooled at the rates lower than 60 °С/min and higher than 250 °С/min have the value of the stacking fault energy lower than 40 mJ/m². In such alloys, the process of deformation twinning is more intensive, and the formed hardened layer has a higher value of abrasive wear resistance. The research group used scanning probe microscopy to investigate the influence of the stacking fault energy on the geometrical parameters of the deformation twins formed on the surface of Hadfield steel in the process of abrasive wear.

The research was financially supported by the grant of the Russian Science Foundation (project no. 15-19-10020).

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