DefinePK

Abstract

Heat treatment is one of the ways to fix the mechanical properties of a material. The principle of heat treatment on steel is the austenite phase’s transformation into another form. Quenching process and partitioning are heat treatment processes to increase the amount of retained austenite in room temperature to obtain steel as a result from strong, hard yet tough heat treatment. In this experimental study, there will be quenching process and partitioning on steel JIS S45C. The heat treatment process for quenching and partitioning are conducted on steel JIS S45C with heating process until austenitization temperature which is 900°C with 4 hours of holding time. The process continued with immersing the specimen into a salt bath at quenching temperature which is 230°C for 10 seconds. After quenching, the specimen immersed into the salt bath at partitioning temperature varied which are 350°C, 375°C, 400°C and 425°C with immersion time also varied for 10 seconds, 100 seconds and 1000 seconds. The cooling media at partitioning temperature is water. After heat treatment; the specimen will be tested to discover the changes that happen to the mechanical properties and micro structure. Those tests are tensile test, metallography test and hardness test. In this experimental study, the result shows that there is an increase in strength, hardness and toughness in the micro structure of steel JIS S45C which is followed by the ductility reduction on the steel.