A comparative study on the dry sliding wear behaviour of nitrocarburised, gas nitrided, fluidised-bed nitrided, and plasma nitrided plastic mould steel

A comparative investigation of the corrosion and tribocorrosion behaviour of nitrocarburized, gas nitrided, fluidized-bed nitrided, and plasma nitrided plastic mould steel

“…1 . On the other hand, it was observed from the hardness profiles that was given elsewhere [22] that PN presented the largest case depth which is known as more effective and uniform as compared to the other nitriding methods [2,26].…”

“…Nitriding process was performed at 560°C during 8 h for NC, GN, and FBN, while it was performed at 520°C during 8 h for PN. More details on the processing methodology were given elsewhere [22].…”

“…No methodological studies were performed in order to quantify the volume fraction of porosity; however, it was measured on the cross-sectional SEM images that GN and FBN resulted in deeper porous layers as compared to NC and PN, having values of 4.72 ± 0.27, 3.92 ± 0.26, 1.70 ± 0.05, and 1.63 ± 0.25 μm, respectively. XRD analysis of the untreated and treated surfaces were given in the previous study [22] where the untreated surface presented only α-Fe phase and treated samples presented ε-Fe 2-3 N and γ′-Fe 4 N that is in accordance with the literature where these compounds have been reported as the main constituents of the compound layer after nitriding processes [26,[29][30][31][32][33]. Besides, NC and FBN samples presented 3 and 4% of Fe 2 O 3 phase, respectively, that may be due to the residual air in the furnace during the process [22,26,34].…”

“…Besides, NC and FBN samples presented 3 and 4% of Fe 2 O 3 phase, respectively, that may be due to the residual air in the furnace during the process [22,26,34]. The phase percentages in the treated samples were calculated based on the XRD spectra given in the previous study [22] by following Eq. (1), and the results are given in Table 1.…”

“…It is well-known that nitriding improves wear and corrosion behaviour of steel surfaces [19][20][21][22][23]. A large number of studies are available in the literature focusing on either wear or corrosion behaviour of nitrided surfaces.…”