Fe-Cr-Ni-Al ferritic alloys
    102.
    发明授权
    Fe-Cr-Ni-Al ferritic alloys 失效
    FE-CR-NI-AL FERRITIC ALLOYS

    公开(公告)号:US5089223A

    公开(公告)日:1992-02-18

    申请号:US604231

    申请日:1990-10-29

    CPC classification number: C22C38/40 C23C8/10

    Abstract: Fe-Cr-Ni-Al ferritic alloy capable of forming hot oxidation/corrosion resistive aluminum oxide scale in the surface thereof by exposure to oxidation environments at elevated temperatures. Due to the ferritic structure, the aluminum oxide scale is formed uniformly and densely to improve scale adherence, or prevent scale flaking. The mechanical properties of the ferritic alloy is considerably improved by incorporation of controlled amounts of Cr, Ni, and Al relative to each other, which are added to precipitate minute Ni-Al intermetallic compounds in the alloy matrix while retaining the ferritic structure. Such minute Ni-Al intermetallic compounds are thought to be responsible for improved mechanical properties, including high temperature strength, tensile strength, hardness and the like. Whereby, the alloy combine excellent hot oxidation/corrosion resistance and improved mechanical properties.

    Abstract translation: Fe-Cr-Ni-Al铁素体合金,其能够通过在高温下暴露于氧化环境而在其表面形成热氧化/耐腐蚀氧化铝氧化皮。 由于铁素体结构,氧化铝鳞片均匀密集地形成,以提高鳞片粘附性,或防止鳞片剥落。 铁素体合金的力学性能通过加入相对于彼此的控制量的Cr,Ni和Al而相当大的改善,加入以在保留铁素体结构的同时在合金基体中沉淀出微小的Ni-Al金属间化合物。 据认为这种微小的Ni-Al金属间化合物负责提高机械性能,包括高温强度,拉伸强度,硬度等。 因此,合金结合了优异的热氧化/耐腐蚀性和改善的机械性能。

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