Abstract
• A new insight of Y enhancing oxidation resistance of high-Mo stainless steel was proposed. • Y restrains the segregation and diffusion of Mo at GB, hindering MoO 3 volatilization. • Y promotes the segregation and diffusion of Cr at GB, accelerating Cr-rich oxide formation. A new insight into the mechanism of Y enhancing high-temperature oxidation resistance of high-Mo stainless steel was proposed from the influence of Y on the segregation and diffusion of Mo and Cr at grain boundary (GB). The results demonstrated that Y restrained the segregation and diffusion of Mo at GB and then hindered MoO 3 volatilization, remarkably reducing its damage to the oxide layer. Meanwhile, Y promoted the segregation and diffusion of Cr at GB and then accelerated the formation of Cr-rich oxides, thus improving the compactness and protectiveness of the oxide layer. Under the combined improvement of the two aspects, Y significantly enhanced the oxidation resistance of high-Mo stainless steel.
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