论文部分内容阅读
测定了定向凝固钴基高温合金DZ40M900℃低周疲劳性能并观察了疲劳断口．结果表明：DZ40M合金具有较高的抗高温低周疲劳性能；疲劳裂纹起源于试样表面优先氧化的碳化物，基体中骨架状分布的碳化物阻滞裂纹扩展；氧化不仅促进疲劳裂纹的形成，而且加速了裂纹扩展DZ40M合金的高温疲劳破坏是机械疲劳与环境氧化双重作用所致.
The low cycle fatigue behavior of DZ40M900 ℃ for directional solidification cobalt-based superalloy was measured and fatigue fracture was observed. The results show that the DZ40M alloy has higher high temperature and low cycle fatigue resistance. The fatigue crack originates from carbide preferentially oxidized on the surface of the sample, and the carbides in the framework distribute in the matrix retard the crack growth. Oxidation not only promotes the formation of fatigue crack, But also accelerates the crack growth DZ40M high temperature fatigue failure is the dual role of mechanical fatigue and environmental oxidation.