Analysis of the effect of Carburizing & Tempering on Mechanical Properties of Mild Steel

Carburization is a heat treatment process which is used to increase the surface hardness of metal. The main objective of this experiment is to determine the effects of different carburization temperature and tempering process on mechanical properties of carburized mild steel. Solid carburization method is used for carburizing the mild steel. In solid carburization method coal is used as a carburizer. Carburization process is done in different temperature 8600C, 9000C 9400C for 2 hours soaking time, then water quenching process is done. In quenching process, the brittleness and hardness value suddenly increases but, this is not required for application. After this, tempering process is applied at 2000 C for 30 minutes of soaking time. Tempering process removes internal stresses and brittleness from carburized mild steel. Carburized and tempered mild steel test specimen is used for various mechanical testing (Hardness testing, tensile testing and toughness testing). Analysis the effect of carburization and tempering process in testing result. The testing result show that the value of hardness and tensile strength increases with increasing the carburization temperature but, the toughness value of mild steel decreases with increasing the carburizing temperature. The highest hardness and tensile strength value is obtained at 9400C carburization temperature. So, it shows that the carburization temperature at 9400C provide the best result for mechanical properties of carburized and tempered mild steel.