定向凝固镍基高温合金4706DS的蠕变疲劳机理研究的中期报告

定向凝固镍基高温合金4706DS的蠕变疲劳机理研究的中期报告摘要：随着航空航天、能源、石油等领域的不断发展，高温合金等材料的应用得到不断拓展，但由于长期高温作用下的蠕变和疲劳等问题，导致材料性能的不断

4706DS 定向凝固镍基高温合金的蠕变疲劳机理研 究的中期报告 摘要： 随着航空航天、能源、石油等领域的不断发展，高温合金等材料的 应用得到不断拓展，但由于长期高温作用下的蠕变和疲劳等问题，导致 4706DS 材料性能的不断下降。本文以定向凝固镍基高温合金为研究对 象，通过相关实验研究和分析，深入探讨了其蠕变疲劳机理。研究结果 4706DS 显示，材料的蠕变疲劳寿命受到多种因素的影响，如高温下的加 工变形、材料的微观组织结构以及表面损伤等。我们发现，在高温下引 入微观组织变化和外部表面损伤会导致其疲劳寿命的显著降低。同时， 蠕变和疲劳在材料中相互作用，存在一定的复合效应。综合研究表明， 4706DS 通过优化材料的微观组织结构和表面处理方式，可以有效提高材 料的蠕变疲劳寿命。 关键词：定向凝固镍基高温合金；蠕变疲劳；微观组织结构；表面 损伤；复合效应 Abstract: With the continuous development of aerospace, energy, and petroleum industries, the application of high-temperature alloys and other materials has been continuously expanded. However, due to the problems of creep and fatigue under long-term high temperature, the performance of materials continues to decline. In this paper, the creep fatigue mechanism of directional solidification nickel-based high-temperature alloy 4706DS was deeply explored through experimental research and analysis. The results showed that the creep fatigue life of 4706DS material was affected by various factors, such as processing deformation at high temperature, microstructure and surface damage of materials. We found that introducing microstructure changes and surface damage at high temperatures would significantly reduce its fatigue life. At the same time, creep and fatigue interacted with each other in the material, and there was acertain composite effect. The comprehensive study showed that by optimizing the microstructure and