研究了Nb在Fe-Ni-Cr-W-Mo-Ti合金中的中高温强化作用。当Nb含量低于1.22wt-％时,合金的650℃拉伸强度、塑性、持久寿命和疲劳极限随Nb含量升高而提高。Nb促使MC相均匀分布,细化晶粒,增加γ′相的数量和提高其稳定性。当Nb含量为1.22wt-％时,小颗粒Laves相在晶界上弥散析出,有利于合金的综合性能;只有当Nb含量过高时,Laves相在晶界过量析出,才使合金性能恶化。
Because Nb accelerates the uniform distribution of MC phase and the grain refinement, as well as, increases the amount and stability of γ'-phase, the tensile strength, ductility, stress rupture life and fatigue limit of an Fe-30Ni-13Cr-1.2W-1.5Mo-2.5Ti-0.4Al superalloy at 650℃ may be improved with increase of Nb content up to 1.22wt-%. The precipitation of small Laves phase dispersed along grain boundaries may be favourable to combined properties of the superalloy containing 1.22 wt-% Nb. And it will be worsened only that the precipitation of Laves phase is too more and Nb content is overmuch.
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