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The application of Inconel-718 ranges from structural components to engine parts such as turbine blades and compressor discs. Inconel-718 is an age-hardenable alloy. We are presenting a comparative tribological study on as-cast and heat-treated Inconel-718 superalloy. The wear behavior of both as-cast and aged Inconel-718 alloy was investigated using a linear reciprocating tribometer at Formula: see textC, Formula: see textC, and Formula: see textC against Si 3 N 4 ball. The heat treatment of Inconel-718 alloy resulted in the improvement of the hardness of the alloy. All the tribological tests were conducted under a constant 20 N normal load. The observed coefficient of friction was found to be decreasing with the increase in temperature. The wear tracks were characterized by a three-dimensional optical profilometer and scanning electron microscopy (SEM). The observed wear volume loss (mm 3 ) of the aged alloy was less than that of the as-cast Inconel-718 alloy. SEM of the worn sample reveals that the main operating wear mechanism at Formula: see textC is delamination whereas at elevated temperatures of Formula: see textC and Formula: see textC, the main operating wear mechanism is abrasion, adhesion, oxidation and spalling. SEM of the counter-surface was also conducted in order to understand the adhesion on its surface and it was found that the adhered oxide contained mainly Ni and Nb oxides.
Dubey et al. (Sun,) studied this question.