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Ashwani Kumar,Bhagyaraj Jayabalan,Chetan Singh,Jayant Jain,Subrata Mukherjee,Krishanu Biswas,Sudhanshu S. Singh 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.4
In the current study, lanthana (La2O3) based oxide dispersion strengthened (ODS) ferritic steels (Fe–xCr–1Ti–1W–0.5L2O3,x = 14, 18, 22, and 26, in wt%) have been fabricated by mechanical alloying and spark plasma sintering. The role of chromium(Cr) content and maximum sintering temperature (1050 and 1100 °C) on the density, microstructure and mechanical propertiesof the ODS steels have been studied. TEM analysis of the alloy revealed the presence of nano-sized (2–8 nm) complexoxide particles, i.e., La–Ti–Cr–O. Mechanical properties were estimated in terms of micro-hardness, nano-hardness, Young’smodulus and compressive strength. The highest micro-hardness (988 ± 11.3 HV) and compressive strength (2322 ± 49 MPa)were exhibited by the alloy having 26 wt% Cr, sintered at 1100 °C. The contribution of dispersion strengthening towards thestrength was calculated to be the highest (~ 72%). Overall, increasing the Cr content improved both the room temperaturecompressive strength as well as the compressive fracture strain.