K17G 铸造镍基合金在750—950℃长期时效后组织稳定,无有害σ相析出,力学性能降低不多.叶片取样经长期时效后虽比标准精铸试样的性能有所降低,但瞬时拉伸性能和持久强度仍保持在较高的水平上.
The K17G cast Ni-base superalloy is the one of low density,high strength and good ductility.Due to the stability of microstructure and lack of harmful a-phase after prolonged aging at 750—950℃,its mechanical properties are slightly lowered only.Although the properties of samples cut and machined from turbine blades subjected also to prolonged aging were been some reduction, in comparison with those of standard precision-cast specimens,their tensile properties and ruptuce strength were still kept at rather high level.
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