The alloy with the air-cooled sample as

The purpose of the study was to determine the effects of different heat treatments on microstructure, wear, hardness and toughness behavior of GX 10CrNiMoNb 18-10 austenitic stainless-steel in order to find alternative usage possibilities of the alloy. This study experimentally showed that increasing grain size was observed with decreasing cooling rates of the alloy. In addition to this, there is a gradual decrease of alloy toughness with increasing cooling rates during the quenching stage of the specimens. The highest impact toughness was exhibited by the furnace cooled specimen while the lowest was of the water-cooled sample. Moreover, the furnace cooled specimen was also found to be the most wear resistant alloy with the air-cooled sample as the second most wear resistant alloy.    Samples of sand mold cast GX 10CrNiMoNb 18-10 (316Cb, 1.4580) grade austenitic stainless steel –5 identical samples of Charpy notched-impact test appropriate dimensions and 5 identical samples of wear test appropriate dimensions–  were used to observe the effects of different heat treatments on the alloy of interest. For each alloy behavior test, one of the specimens served as the control sample in cast condition. The remaining four specimens were subjected to heat treatment; each with a different cooling condition. The chemical composition of the alloy was determined using Optical Emission Spectroscopy. The 4 samples were subjected to Charpy notched-impact test to measure the toughness of the samples.Wear tests were also done using a ball-on-disc tribometer under dry sliding conditions at room temperature. Subsequently, the samples were subjected to microanalysis with FEI Quanta 50 Scanning Electron Microscope with Energy Dispersive X-ray Analysis (SEM/EDX) equipment.From the SEM/EDX Analysis, the composition of the alloy has been identified and was able to see the formed niobium carbide and chromium carbide. The size of the grains and its relation to the different heat treatment procedures were also discussed. It showed that samples that were slowly cooled (furnace cooled and air cooled) formed coarser grain sizes while the ones quenched with water and oil yielded finer grain sizes.These cooling media also influence the geometry of the precipitates. Ferrite content was also determined using Schaeffler-Delong diagram and was found to be about 2%, and was later concluded that the ferrite ratio does not affect the heat treatment results. Among the samples, the one cooled in a furnace possessed the highest impact toughness while the as-cast sample showed the lowest. In the wear test, results show that the furnace cooled sample has the highest wear resistance, followed by the air cooled.