CAJ | 학술논문

单晶叶片技术是提高航空发动机及地面燃气轮机性能、寿命及可靠性的关键技术之一，但单晶材料机械、力学性能的各向异性特性制约了其发展和应用，对其工程应用及应用的理论基础提出了挑战。课题组开展了各向异性单晶叶片强度分析和寿命预测方面的一些研究工作。包括：建立并验证了弹塑性、蠕变滑移本构模型及蠕变持久寿命预测方法；进行了不同晶体取向DD3单晶在不同温度、不同速率或不同温度、不同应力水平下的拉伸试验及蠕变试验，这些实验数据及由其反映的单晶中、高温各向异性特性对单晶材料的应用具有重要意义。此外还进行了某种单晶叶片的实验研究。作为上述研究的应用，对某发动机单晶涡轮叶片进行了强度分析和寿命预测。本文这一部分介绍试验研究工作，本构模型及其应用已在本文第I部分作了介绍。
단정협편기술시제고항공발동궤급지면연기륜궤성능、수명급가고성적관건기술지일，단단정재료궤계、역학성능적각향이성특성제약료기발전화응용，대기공정응용급응용적이론기출제출료도전。과제조개전료각향이성단정협편강도분석화수명예측방면적일사연구공작。포괄：건립병험증료탄소성、연변활이본구모형급연변지구수명예측방법；진행료불동정체취향DD3단정재불동온도、불동속솔혹불동온도、불동응력수평하적랍신시험급연변시험，저사실험수거급유기반영적단정중、고온각향이성특성대단정재료적응용구유중요의의。차외환진행료모충단정협편적실험연구。작위상술연구적응용，대모발동궤단정와륜협편진행료강도분석화수명예측。본문저일부분개소시험연구공작，본구모형급기응용이재본문제I부분작료개소。
The single crystal blade is one of the key technologies forimproving the performance, durability and reliability of aero-engines and ground gas-turbine engines. However, the anisotropic mechanical properties of the single crystal material makes a great deal of difficulties on the development and the application of the single crystal blade, which is a challenge for the engineering application of the single crystal superalloy and the theoretic bases of the application. Some researches on the strength analysis and the life prediction of the anisotropic single crystal blade were carried out by the authors’ research team. They are as follows. The crystallographic constitutive models for the plastic and the creep behaviors and the method of the rupture life prediction were established and verified. The tensile or the creep experiments for DD3 single crystal alloy with different orientations under different temperatures and different tensile rates or under different temperatures and different stress levels were carried out. The experimental data and the anisotropic properties at intermediate and high temperatures revealed by the experiments are significant for the application of the single crystal alloy. In addition, the experimental research for a kind of single crystal blade was also made. As the application of the researches the strength analysis and the life prediction were carried out for the single crystal blade of a certain aeroengine. In this part, the experimental research work is describled, and the constitutive models and applications have been described in part I.