Time And Temperature Effects On Fracture Properties Of Carburized Low Carbon Steel

Muhd Nurulhafizan, Mahat (2008) Time And Temperature Effects On Fracture Properties Of Carburized Low Carbon Steel. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Carburizing which have been widely used as one of surface treatment to a material can improve the mechanical properties of materials such as surface hardness and wear resistance. The carburization method that is used in this study was pack carburizing using Wilcarbo powder. The method was very effective in introducing carbon but the method was exceedingly slow. Material that was used in the study was Low Carbon Steel (AISI 1020).16 specimens were prepared according to the standard ASTM E399. Certain machining process need to be done in order to prepare the specimen to the required dimension such as cutting, facing and grinding. The carburizing was conducted with variation of time and temperature to study the effect to the fracture properties of the material used which is low carbon steel. 5 pieces of specimen was prepared as a reference to do the comparison between results of carburized and uncarburized specimen while the other specimen was carburized before proceeding to fracture toughness test by using three-point bending test. Specimen with higher carburizing temperature resulting in lower value of KIC . The average fracture toughness value obtained for uncarburized specimen is 125.088±17.981 MPa/√m and for the carburized specimen is 126.607±14.929 MPa/√m. Highest fracture toughness value was obtained at 850°C carburizing for 3 hours and the lowest fracture toughness value was obtained at 900°C carburizing for 6 hours. However, the differences is so small and can be assumed that both temperature and time has no significant effects on the fracture properties of the carburize specimen.

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