Journal of Emerging Trends in Engineering and Applied Sciences: Research Areas

Article Title: Statistical Analysis Of Heat Treatment Parameter And Corrosion Behaviour Of 800H Series Ni-Fe Superalloy In HCL Solution
by Nwogbu, C. C,Nwogbu Paul U. and Arum Marcel O.

Abstract:
Ni-Fe superalloys are used in turbine engine and high temperature applications. Heat treatment is one of the major processes used in the modification of the mechanical properties. In order to save time and energy in the application of these alloys, it is important to find the appropriate heat treatment condition for these alloys. The experiment involves the investigation of the correlation between heat treatment parameter and corrosion behavior of 800H Ni-Fe superalloy in HCL solution. The sample was produced by spark plasma sintering (SPS) and was heat treated at temperatures of 800 and 10000C and time of 1 and 2 hours for each temperature. Potentiodynammic anodic polarization techniques were used to carry out the electrochemical studies in HCL medium. From the results the heat treated alloy showed better corrosion resistance than the untreated alloy. Heat treatment temperature and time have great influences on the corrosion behavior and morphology of the alloy. The sample heat treated at 8000C for 1hour gave a high protection efficiency of 84.91%. it has been established that heat treatment can be used to improve the corrosion resistance of the alloy. The appropriate heat treatment temperature and time to obtain the optimum result has been established.

Keywords: Ni-Fe alloy, Microstructure, Corrosion, Heat Treatment and HCL medium

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