Effect of cyclic oxidation on the tensile behavior of a Fe-Cr-Si coated Nb-base alloy
0103 physical sciences
02 engineering and technology
0210 nano-technology
01 natural sciences
DOI:
10.1016/j.corsci.2017.11.023
Publication Date:
2017-11-24T09:47:50Z
AUTHORS (3)
ABSTRACT
Abstract The room temperature tensile properties of Fe-Cr-Si coated C103 alloy are evaluated after cyclic oxidation at 1100–1300 °C for 30–180 min. The strength increased marginally (by 10–20 MPa) after oxidation at 1100 °C, whereas the ductility decreased by ∼50%. Oxidation at 1300 °C for 180 min caused a greater increase in strength (by 10–15%) and deterioration in ductility to 9%. Localized embrittlement of the substrate sub-surface regions in the vicinity of cracks formed in the coating, HfO 2 precipitation at grain boundaries, and intergranular cleavage caused lowering of ductility during cyclic oxidation. Nevertheless, the coating prevented catastrophic oxidation and is indispensable for hypersonic applications.
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