Scientific journal
Scientific Review. Technical science
ISSN 2500-0799
ПИ №ФС77-57440

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TEMPERING RESISTANCE OF HARDENED CONSTRUCTIONAL LOW CARBON STEELS AFTER COLD RADIAL FORGING

Balakhnin A.N. 1
1 State National Research Politechnical University of Perm. Perm
Thermal stability of low carbon steels grades 10H3G3MF and 10H3G3MFT cold deformed by radial forging method was investigated. Initial structure of steels before cold plastic deformation (CPD) by radial forging (RF) method was lath martensite. Degree of plastic deformation (ε) was 60 %. For the purpose of study tempering resistance we realized heat treatment by following conditions: stoving to the temperature 400–600 oC; curing time – 30, 60, 120, 360 minutes; water cooling. Degree of tempering and recrystallization development was estimated by steel hardness evolution. It was shown that difference between value of hardness at core and edge of cold forged steel rods are survived after all heat treatments. Judging by the plot of hardness evolution and transmission electron microscopy analysis findings, processes of tempering and recrystallization in steel 10H3G3MF were realized after 1 hour at temperature 400–600 oC and in steel 10H3G3MFT – after 2 hours. High level of tempering resistance of investigating steels and decelerating of tempering and recrystallization processes by Ti alloyage were experimentally shown.