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Creep resistant high temperature martensitic steel
Creep resistant high temperature martensitic steel
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机译:耐蠕变高温马氏体钢
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摘要
The disclosure provides a creep resistant alloy having an overall composition comprised of iron, chromium, molybdenum, carbon, manganese, silicon, nickel, vanadium, niobium, nitrogen, tungsten, cobalt, tantalum, boron, copper, and potentially additional elements. In an embodiment, the creep resistant alloy has a molybdenum equivalent Mo(eq) from 1.475 to 1.700 wt. % and a quantity (C+N) from 0.145 to 0.205. The overall composition ameliorates sources of microstructural instability such as coarsening of M23C6carbides and MX precipitates, and mitigates or eliminates Laves and Z-phase formation. A creep resistant martensitic steel may be fabricated by preparing a melt comprised of the overall composition followed by at least austenizing and tempering. The creep resistant alloy exhibits improved high-temperature creep strength in the temperature environment of around 650° C.
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机译:本公开提供了一种抗蠕变合金,其具有由铁,铬,钼,碳,锰,硅,镍,钒,铌,氮,钨,钴,钽,硼,铜和可能的其他元素组成的整体组成。在一个实施例中,抗蠕变合金具有1.475至1.700wt。%的钼当量Mo(eq)。 %和0.145至0.205的量(C + N)。整体组成改善了微观结构不稳定性的来源,例如M 23 Sub> C 6 Sub>碳化物和MX沉淀的粗化,并减轻或消除了Laves和Z相的形成。耐蠕变马氏体钢可以通过制备由整体组成组成的熔体,然后至少进行奥氏体化和回火来制造。抗蠕变合金在约650°C的温度环境下表现出改善的高温蠕变强度。
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