交变温场对高温腐蚀的影响

The Influence of Thermal Expansion to High Thmperarure Errosion in Alternative Thermal Field

金属在受高低温交变影响时，由热膨胀系数的差异在金属内部引起了晶格畸变，并产生了微上的空间——高温空洞。在热胀冷缩的不断的作用下，高温空洞连成一片，穿透金属基体表面，构成高温隧洞。高温隧洞的不断堆积就形成不可逆转的疏松，导致耐温金属抗高温摩擦性能的降低，最终造成构件失效。本文主要讨论以Ｆｅ、Ｃｒ。

When the heat-resisting steel is iuflueuced by the alternation ot high temperature and low temperature,because of the difference ot thermal expansion coefficient,disfigurement ot lattice is caused loithin the metal resulting in ting spaces high-temperature holes。llnder The constant action ot expansion when heated and contraction when cooled,the penetrating the surface ot the metal,formcing high-temperature tunnel。The continued accumulation ot high-temperature tunnels resulted in the unreversible porosity。This lowers the ability ot The material's anti-heat friction,finally makes The prodact lose eeffectiveness。This arti-cle primarily discusses The alloy whose macin cornponents are Fe,C and Cr。