Surface microstructures and properties of oxide-reinforced FeCrAl matrix composite coatings prepared by laser cladding on a ferritic-martensitic steel

Microstructure, Mechanical Properties, and Lead–Bismuth Eutectic Corrosion Behaviors of FeCrAlY-Al2O3 Nanoceramic Composite Coatings

“…Figure 8 demonstrates that the hardness, modulus of elasticity, and wear resistance of the FeCrAlY nanoceramic composite coatings are superior to those of the F/M steel substrate. The values of hardness and modulus of elasticity of the samples show a turning point at a depth of about 200 µm, which separates the fully remelted zone from the heataffected zone [47]. In the fully remelted zone, the substantial increase in coating hardness is mainly due to the precipitation solid solution strengthening of Cr and Al during the remelting process, as well as the second-phase strengthening by the addition of nano-Al 2 O 3 and precipitation phases generate during the remelting process [50][51][52].…”

“…As shown in Figure 8c, the elastic modulus is determined by the bond strength; in other words, it is affected by factors such as chemical composition and crystal structure. The enhancement of the elastic modulus in the heat-affected zone mainly originates from the reduction in the average atomic spacing due to the misalignment of the large-sized atoms [47,60], implying that the free volume becomes less while the atoms in the heataffected zone are more tightly packed. To summarize, the hardness and modulus of elasticity values of the Fe9Cr12Al0.5Y coatings are approximately the same as those of the Fe12Cr5Al0.5Y coatings.…”

“…Incorporating suitable nanoceramic particles (<10 wt%) can further enhance coating mechanical properties, such as hardness, wear resistance, and compressive strength [43][44][45][46]. Recently, oxide-reinforced FeCrAl matrix composite coatings have been proven to achieve good mechanical properties by adding nano-Al 2 O 3 [47]. Overall, FeCrAlY nanoceramic composite coatings show great potential in LBE environments.…”