论文部分内容阅读
本文研究了含Mg、Zr与不含Mg、Zr两种GH33A合金的高温疲劳和静、动态蠕变行为。结果表明,微量元素Mg、Zr对提高疲劳性能不显著,也不能改善疲劳缺口敏感性。缺口疲劳性能取决于缺口的几何参数Kt与λ,材料的光滑疲劳极限和平均晶粒尺寸微量元素Mg、Zr的良好作用主要表现在静态蠕变条件下,充分发展和延长了蠕变第Ⅱ和第Ⅲ阶段,增加蠕变断裂延伸率,并大大提高断裂寿命。这种良好作用在恒载且迭加有疲劳交变应力的动态蠕变条件下仍然保持。
In this paper, high temperature fatigue and static and dynamic creep behaviors of GH33A alloys containing Mg, Zr and without Mg, Zr were studied. The results show that the trace elements Mg and Zr have no significant effect on improving the fatigue performance and can not improve the fatigue gap sensitivity. Gap fatigue performance depends on the geometric parameters of the notch Kt and λ, the material’s smooth fatigue limit and the average grain size The good effect of the trace elements Mg, Zr is mainly manifested in the static creep conditions, fully develop and extend the creep Ⅱ and The third stage, increase the creep rupture elongation, and greatly improve the fracture life. This good effect is still maintained under dynamic creep conditions with constant load and fatigue fatigue stress.