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Inconel 718合金中主要强化相为体心四方有序点阵γ”相、DO_(22)。型结构,化学组成为Ni_3Nb(Ti、Al);辅助强化相为有序面心立方γ’相、LI_2型结构,组成为Ni_3(Ti、Al、Nb)。由于γ“相的不稳定性致使该合金仅在650℃以下具有良好的强化效果,高于此温度,γ”迅速粗化且向稳定的δ-Ni_3Nb相转变,导致合金强度迅速下降,成为该合金在更高温度下使用的一个限制。早在70年代0ozar及Pineau进行了探求[1],他们调整了718合金成分及相应的热处理制度,获得了立方体的γ’相及其六面体上附着γ”相的复合组织,并称之为包复组织。(compact morphobgy)。时效硬化曲线表明:这种组织在高于650℃时具有良好的稳定性。
The main strengthening phases in Inconel 718 alloy are the body-centered tetragonal ordered lattice γ “phase and DO_ (22). The chemical composition is Ni_3Nb (Ti, Al); the auxiliary strengthening phase is the ordered face- LI_2 type structure with Ni_3 (Ti, Al, Nb) .Because of the instability of γ ”phase, this alloy has a good strengthening effect only below 650 ℃. Above this temperature, γ“ rapidly coarsens and The transition to a stable δ-Ni_3Nb phase led to a rapid decrease in alloy strength, which became a limitation of its use at higher temperatures. As early as the 1970s, 0ozar and Pineau were explored [1], who adjusted the composition of 718 alloy and the corresponding Heat treatment system to obtain the cubic γ ’phase and its hexahedron attached γ ”phase of the composite organization, and called the complex organization. (compact morphobgy). The age-hardening curve shows that this structure has good stability above 650 ° C.