Quenching- Tempering Effects On Fracture Properties In Carburized Low Carbon Steel

Mohd Adzwan, Addly (2008) Quenching- Tempering Effects On Fracture Properties In Carburized Low Carbon Steel. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Quenching and tempering process are two common processes that are used in the industrial. Quenching is the process where the steel is rapidly cooled after carburizing by using quenching medium such as oil while tempering is the process where the steel is heated at certain temperature between 400oC to 600oC. In this research, 20 specimens of low carbon steel specimens with dimension of 100mm x 19mm x 10mm are used for heat treatment process such as carburizing, quenching, tempering and normalizing. Then the specimens were fracture by using fracture toughness test as per ASTM E399. The effect of this heat treatment process on the fracture properties were analyzed by doing statistical analysis which is hypothesis test. As for data comparison, 4 set of specimens were treated with different heat treatment process. The results from this research showed that the fracture toughness become higher when the specimen undergo quenching and tempering process. This is due to the change of microstructure in the material which it increases the ductility and strength of the specimen therefore making it tougher and durable. Furthermore, the carburizing process diffused more carbon on the specimens which resulted in a higher wear resistance and hardness surface. As a conclusion, this research gives important information and helps the industry to increase the production of steel with higher strength and longer life span.

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