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CN101490289B 富镍耐磨合金及其制备方法和用途 有权

富镍耐磨合金及其制备方法和用途
摘要：
一种富镍的耐磨合金，以重量％计包含：0.5-2.5％C、0.5-2％Si、至多1％Mn、20-30％Cr、5-15％Mo、5-15％W、15-30％Fe、余量Ni。该合金还可以包含其它的合金化组分如每种至多1.5％的Ti、Al、Zr、Hf、Ta、V、Nb、Co、Cu，至多0.5％B，和至多0.5％的Mg加Y。该合金优选具有主要含共晶反应相、细金属间相和析出碳化物的显微组织。例如，该显微组织可以含有富Cr、Ni、W的金属间相和/或该显微组织可以含有均匀薄层型共晶凝固组织。该合金可用作内燃发动机如柴油发动机的气门座镶圈。对于含至多1.8％C的气门座镶圈合金，该显微组织优选不含初生枝状碳化物。对于含超过1.8％C的气门座镶圈合金，该显微组织优选含有非枝状型初生碳化物。对于含至多1.5％C的气门座镶圈，该显微组织优选包括被共晶反应产物包围的固溶相。
摘要（英）：

A nickel-rich wear resistant alloy comprises in weight% 0.5 to 2.5% C, 0.5 to 2% Si, up to 1% Mn, 20 to 30% Cr, S to 15% Mo, 5 to 15% W, 15 to 30% Fe, balance Ni. The alloy can include further alloying constituents such as up to 1.5% each of Ti, Al, Zr, Hf, Ta, V, Nb, Co, Cu, up to 0.5% B and up to 0.5% Mg plus Y. The alloy preferably has a microstructure containing predominantly eutectic reaction phases, fine intermetallic phases and precipitation carbides. For instance, the microstructure may contain Cr. Ni, W rich intermetallic phases and/or the microstructure may contain uniform lamellar type eutectic solidification structures. The alloy is useful as a valve seat insert for internal combustion engines such as diesel engines. For a valve seat insert containing up to 1.8% C the microstructure preferably is free of primary dendritic carbides. For a valve seat insert alloy containing over 1.8% C the microstructure preferably contains non-dendritic type primary carbides. For a valve seat insert containing up to 1.5% C the microstructure preferably includes solid solution phases encompassed by eutectic reaction products.

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