Nosov Magnitogorsk State Technical University (Magnitogorsk, Russia):

A. G. Korchunov, Dr. Eng., Prof., Vice-Rector on International Affairs
G. S. Gun, Dr. Eng., Prof., Advisor of the Rector
K. G. Pivovarova, Cand. Eng., Associate Prof., Chair of Materials Processing Technologies, e-mail: kgpivovarova@gmail.com

Magnitogorsk Hardware and Metallurgical Plant “MMK-Metiz” (Magnitogorsk, Russia):

O. P. Shiryaev, Director

The method of differential scanning calorimetry (DSC) has been used for examination of structural transformations (forming and decomposition of austenite) in hot-rolled highcarbon steel 80. All three stages of forming of homogeneous austenite can be observed distinctly on the DSC heating curve for this steel. It was established that austenite transformation during continuous cooling (with rates 10 and 50 °/min) occurs in correspondence with the type of carbide-ferrite mixture, with extraction of α-phase of one morphological structure. The critical points at steel 80 heating are determined. Influence of cooling rate on shift of the Ас₁ and Ас₃ points is shown. Necessity of usage of high temperatures in austenitization furnace to provide wire rod temperature at the furnace exit in the range 930–980 °С is confirmed.

The study was financially supported by Ministry of Education and Science of the Russian Federation within the scope of accomplishment of multiple-purpose project on creation of modern high-tech production with the participation of higher education institution (Contracts No. 02.G25.31.0178 dated 01.12.2015; No. МК204895 dated 27.07.2015).

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