多组元交互作用对第四代单晶高温合金组织稳定性和蠕变行为的影响规律

项目名称： 多组元交互作用对第四代单晶高温合金组织稳定性和蠕变行为的影响规律

项目编号： No.51271015

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 一般工业技术

项目作者： 冯强

作者单位： 北京科技大学

项目金额： 80万元

中文摘要： 自主研发含Re和Ru的第四代单晶高温合金已成为我国高推重比航空发动机的战略需求；而Re和Ru价格昂贵，是制约其应用的主要因素之一。目前，国际学术界在复杂多组元的单晶高温合金中针对Co与Ru对组织稳定性的影响机理和Mo与Cr交互作用对蠕变性能的影响规律尚不明确。对上述科学问题的解决有助于认识它们对Re和Ru的替代作用。 在已结题的基金项目（50671015）和前期研究工作基础上，本项目设计八种低Re的实验合金，从合金元素分配比和错配度的定量分析入手，系统研究合金元素、成分分配比、错配度、组织稳定性（TCP相析出和γ'相筏排化）、加载下的位错组态及组织演变与蠕变性能之间的关系，阐明Ru、Co、Mo和Cr等四种元素的独立和交互作用对镍基单晶高温合金组织稳定性和蠕变性能的影响规律，并确定主次影响因素。本项目的实施将为低成本、低密度、高性能的新一代单晶高温合金成分设计与性能优化提供科学的依据。

中文关键词： 高温合金；组织稳定性；蠕变；单晶；钌

英文摘要： To meet domestic demands of advanced aircraft engines with high thrust-weight ratio, it is necessary to develop the fourth generation Ni-based single crystal superalloys containing Re and Ru, independently. But the expensive cost of Re and Ru restricts their application in aerospace industry. Meanwhile, the mechanisms based on the influence of Co and Ru on microstructural stability and the interaction effect of Mo and Cr on creep behavior are still controversy, due to the complex effects of multiple alloying elements in single crystal superalloys. Clarifying the mechanisms associated with these alloying elements is beneficial to understand whether they can substitute for Re and Ru. In the current study, eight experimental alloys containing low content of Re were designed with various levels of Co, Ru, Mo and Cr additions based on our previous studies. According to general principles of physical metallurgy, the quantitative analyses of elemental partitioning ratios and lattice misfits will be carried out by using advance techniques of materials characterization. The relationship among alloying elements, elemental partitioning ratios, lattice misfits, microstructural stability associated with the precipitation of TCP phases and the rafting behavior of γ' phase, dislocation configurations under creep deformation an

英文关键词： Superalloy；Microstructural stability；Creep；Single crystal；Ru