Case Carburizing of Low Carbon Steel with Different Temperatures and Time

الملخص

The heat treatment and carburization has been acknowledged by some means of improving the various properties of metals and alloys. In the present investigation the mechanical and microstructure of mild steels carburized at different temperature range of 850, 900 and 950 Co at different times of 1,2,3 and 4 hours have been studied before water quenching,the chemical composition and the microstructures of these samples were characterized by spectrometry and optical microscopy. The microhardness of the surface of each sample was measured and preliminary tensile testing was conducted. The results showed the formation of a significant hardened case due to the formation of martensite, while the core retained its original ferrite-carbide microstructure and was softer and tougher. Tempering was carried out at 200CO, 400CO and 600CO in order to stress relieve the quenched samples and to increase the toughness of the steel case with an acceptable reduction in hardness