Investigation On The Effect Of Heat Treatment On Fracture Toughness Of Pressure Vessel Steel

Ismail , Bolong (2009) Investigation On The Effect Of Heat Treatment On Fracture Toughness Of Pressure Vessel Steel. Project Report. UTeM, Melaka,Malaysia. (Submitted)

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Abstract

Structural failure by fracture toughness in pressure vessel steel A516 Grade 70 of low carbon steel can have severe consequences in term of heat treatment. Fracture toughness KIC test is used to examine the toughness of each specimen after heat treatment process done. In this research, the most common type of this term is discussed and analyzed. The types of heat treatments that have been done like tempering on 400oC, quenching in water, normalizing and full annealing. The structural after heat treatment exposed to change the mechanical properties to this material. Resulting from these changes affected the fracture toughness KIC value. The methodologies were used such as Scanning Electron Machine and Axioscope Zeiss Optical Microscope to examine the microstructure by 50x magnification. Vickers Hardness and Tensile Test also were used to observe the mechanical properties of each specimen. Fracture toughness KIC value is obtained by using Instron Machine. As result, KIC graph show that tempering heat treatment make specimen tougher, hard and high strength compare to full annealing, normalizing and base metal. But, this specimen has low ductile and brittle.

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