研究了几种不同结构的铝化物涂层的涂层-合金系统在900℃时的高周疲劳性能。结果表明:粗大等轴晶单相的NiAl(β)层对疲劳寿命有不利的影响。当NiAl(β)中含有粗大富难熔金属颗粒时,疲劳寿命降低,组织细密的NiAl(β)层中弥散分布大量极细小的γ′、准σ相等第二相质点,则提高涂层-合金系统的疲劳性能。
The high-cycle fatigue performance of different microstructures of aluminide coating-superalloy system has been studied at 900℃. The single phase coating of coarse equiaxial grain NiAl (β) has unfavourabie effect on fatigue life of the coating-superalloy. The fatigue life may shorten if the coating of NiAl (β) was an enrichment of coarse refractory metal grains. While an improvement can be made by dispersing numerous secondary phase particles such as extreme fine γ', quasi-σ phase and others.
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