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本文研究了晶粒大小和Mg对GH169合金持久与缺口周期持久性能的影响。结果表明,微量Mg及晶粒细化会有效地改善该合金的缺口持久敏感性。存在缺口持久敏感性或低塑性的GH169台金,在蠕变疲劳交互作用下将会严重导致材料的弱化而引起过早的断裂,用Mg微合金化和晶粒细化,即使存在一定数量小晶的混晶组织也会显著提高合金的缺口周期持久寿命。
In this paper, the effects of grain size and Mg on the ductility and the ductility of GH169 alloy were studied. The results show that the trace Mg and grain refinement will effectively improve the long-lasting sensitivity of the alloy. GH169, which has a long-lasting indefinite sensitivity or a low plasticity, will cause severe premature rupture of material under creep-fatigue interaction, with microalloying of Mg and grain refinement, even with a small number of small Crystal mixed crystal structure will also significantly improve the alloy’s notch life cycle.