When Cr and Mn are oxidized at 550~800℃, Cr2O3 oxide layer and a small amount of Mn3O4 are formed on the substrate surface. Mo and Si diffusion rate is slow and gather at the interface between Cr2O3 oxide layer and substrate. The stainless steel oxidizes 100 at 800℃ After h, the Cr2O3 layer is locally destroyed and the oxidation resistance is weakened. The SiO2 and NiMoO4 generated by the reaction of oxygen through the crack and Si and Mo at the interface play an active role in the oxidation resistance of the alloy.
At 600~800 ℃, the tensile strength of 316L stainless steel decreases with the increase of temperature, and the elongation increases with the increase of temperature. At 600 and 800 ℃, the tensile strength is 355.1 and 155.4 MPa, and the elongation is 11.9% and 33.9%, respectively.
With the increase of oxidation temperature from 600 ℃ to 800 ℃, Mo and Si elements at the tensile fracture interface of 316L stainless steel decrease, and the increase of temperature promotes Mo and Si elements to converge to Cr0, the interface between the oxide layer and the substrate, which is easy to contact with oxygen and consume oxidation. The consumption of Mo and Si elements reduces the tensile strength of 316L stainless steel and improves the ductility and toughness.
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