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Analysis of phase transformations in the austenite range for continuous cooling of 38CrSiMo4–2–3 steel

Różniata Edyta

Inżynieria Materiałowa

2019

Vol. 40, nr 6

128--132

This article describes the kinetics of phase transformations of undercooled austenite of 38CrSiMo4–2–3 alloy steel. The tested steel is called a model alloy, whose chemical composition represents a group of steels for heat improvement. In the research part, microstructural analysis was used, dilatometric method was used and hardness was measured. For the analysis of phase transformations under continuous cooling, steel samples were austenitized at 880°C, annealed for 20 min, and then cooled at various speeds in the range of 20°C/s÷0.1°C/s. On the developed CCT diagram of 38CrSiMo4–2–3 steel, the onset of ferrite and perlite evolution was observed in the cooling range of 1°C/s and 0.1°C/s. In turn, the “nose” of bainitic transformation occurs for a cooling curve of 10°C/s. The temperature at the beginning of the martensitic transformation Ms was 350°C. The steel was characterized by rather "low" hardenability, because to obtain the martensite itself in its microstructure, the use of cooling at a rate greater than 20°C/s was required.

W artykule opisano kinetykę przemian fazowych przechłodzonego austenitu konstrukcyjnej stali stopowej 38CrSiMo4–2–3. Badana stal jest tzw. stopem modelowym, który składem chemicznym reprezentuje grupę stali do ulepszania cieplnego. Finalnie opracowano wykres CTPc dla stali 38CrSiMo4–2–3.