Dilatometric and Microstructural Study of Martensite Tempering in 4% Mn Steel

Materials

Adam Grajcar¹  Mateusz Morawiec¹  Carlos Garcia-Mateo²  JoseAntonio Jimenez² 

[1] Department of Engineering Materials and Biomaterials, Silesian University of Technology, 44-100 Gliwice, Poland;Department of Physical Metallurgy, National Center for Metallurgical Research, 28040 Madrid, Spain;

关键词: quenching;    tempering;    medium-Mn steel;    martensitic transformation;    dilatometry;    cementite precipitation;   

DOI  :  10.3390/ma13194442

来源: DOAJ

【 摘 要 】

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 M_s 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.

【 授权许可】

Unknown