High-entropy AlxCoCrFe2.7MoNi (x = 0, 0.5, 1.0, 1.5, 2.0) alloy coatings were prepared on pure iron by laser cladding. The effects of Al content on the microstructure, hardness, wear resistance and corrosion resistance of the coatings were studied. The results showed that the crystal phases of the AlxCoCrFe2.7MoNi coatings changed from Mo-rich BCC1 + FCC to (Al, Ni)-rich BCC2 + Mo-rich BCC1 when x increased from 0 to 0.5, and the phase changed to an (Al, Ni)-rich BCC2 + (Mo, Cr)-rich σ phase as x increased further. The hardness of the coatings increased as the Al content increased. The Al2.0CoCrFe2.7MoNi coating exhibit best wear resistance. Addition of Al increased the corrosion potential in a 3.5 wt.% NaCl solution, and the coating with x = 1.0 exhibited the highest corrosion resistance.
As an important energy application material, 12MnNiVR steel plate is widely used in the manufacture of crude oil storage tanks. In this paper, in order to explore the causes of unqualified 12MnNiVR steel plate, the samples of unqualified steel plate and continuous casting slab in the same furnace were analyzed by means of metallographic microscope, scanning electron microscope and energy spectrum analysis. There is serious alloy element segregation in the continuous casting slab and steel plate, and the abnormal structure enriched in the segregation zone leads to internal microcracks, which further expand in the subsequent rolling process. The segregation of large sulfide inclusions in the micro cracks and porosity of the continuous casting slab seriously. There are also high-grade looseness in the continuous casting slab, which is not fully welded in the rolling process. As a crack source, it expands and cracks in the cooling process of the steel plate heat treatment, which is also the main reason for the unqualified steel plate flaw detection.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.