Abstract
This paper presents the results of martensite tempering resistance in 4% Mn steel. The material was quenched and tempered at 350 °C for 15, 30, and 60 min. The analysis of the quenching and tempering was carried out using dilatometric and microstructural approaches. The phase composition was assessed using X-ray diffraction. The Ms temperature and tempering progress were simulated using JMatPro software. The dilatometric analysis revealed a small decrease in the relative change in length (RCL) during tempering. This decrease was connected to the precipitation kinetics of cementite within the martensite laths. The microstructure investigation using a scanning electron microscope showed a very small amount of carbides, even for the longest tempering time. This showed the high tempering resistance of the martensite in medium-Mn steels. The hardness results showed an insignificant decrease in the hardness depending on the tempering time, which confirmed the high tempering resistance of martensite.
Highlights
Medium manganese steel is a grade of steel that uses Mn as an important alloying element for the stabilization of retained austenite at room temperature
The first step of the experiment was the quenching of the medium manganese steel
The martensite in the analyzed 4% Mn steel had a high resistance to the tempering steel was performed
Summary
Medium manganese steel is a grade of steel that uses Mn as an important alloying element for the stabilization of retained austenite at room temperature. The formation of the ferrite leads to the diffusion of carbon and manganese (for sufficiently long times) into the austenite This element increases its thermal stability, which favors higher amounts of the γ phase at room temperature. Another possible heat treatment is austempering for the bainite formation after austenitization [4,5]. Very complex microstructures can be obtained in this way, leading to better mechanical properties All of these treatments use the rejection phenomenon of carbon and manganese from the alpha phases
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