Effect of overheating on the strength of single crystal superalloy DD6: Mechanism, simulation and prediction

IF 5.5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2025-09-19 DOI:10.1016/j.matchar.2025.115577

Dongxing Pan , Xiaogang Wang , Ruoyao Cui , Chao Jiang , Xiaoming Shan , Dong Mi , Zhicheng Liu

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引用次数: 0

Abstract

Aero-engines may face the risk of One-Engine-Inoperative (OEI) during service, which typically leads to overheating lasting tens of seconds. This very short overheating process may have a significant impact on the mechanical properties of the material used in safety-critical components of aero-engines, such as turbine blades. This paper aims to understand the effect of overheating on the yield strength of nickel-based single crystal superalloy DD6 through a comprehensive investigation. A first surprising experimental finding is that the overheating under some typical OEI conditions may increase rather than decrease the yield strength of the DD6 superalloy. And the highest increase can reach 20 % to 30 %. The underlying micromechanical mechanisms supporting this counterintuitive finding are revealed in this work. It shows that the overheating enables directional coarsening of the primary γ' precipitates and simultaneous precipitation of the finer secondary γ' precipitates, which thereby imposes a complex impact on hindering dislocation behavior. In particular, the secondary γ' precipitation plays an important role in this deformation mechanism. This is supported by molecular dynamics simulation conducted at the atomic scale. Finally, a yield strength prediction model that enables taking into account the overheating effect is proposed. The experimental verification shows that the proposed model enables predicting the yield strength of DD6 alloy after experiencing a given OEI, with an acceptable error level of less than 5 %.

查看原文本刊更多论文

过热对单晶高温合金DD6强度的影响：机理、模拟与预测

航空发动机在使用过程中可能面临单引擎不工作（OEI）的风险，这通常会导致持续数十秒的过热。这种极短的过热过程可能会对航空发动机安全关键部件（如涡轮叶片）中使用的材料的机械性能产生重大影响。本文旨在通过全面研究，了解过热对镍基单晶高温合金DD6屈服强度的影响。第一个令人惊讶的实验发现是，在某些典型OEI条件下的过热可能会增加而不是降低DD6高温合金的屈服强度。最高增幅可达20% ~ 30%。这项工作揭示了支持这一反直觉发现的潜在微力学机制。结果表明，过热使初生γ′相定向粗化，同时析出较细的次生γ′相，从而对阻碍位错行为产生复杂的影响。其中γ′次生析出在该变形机制中起着重要作用。这得到了在原子尺度上进行的分子动力学模拟的支持。最后，提出了一种考虑过热效应的屈服强度预测模型。实验验证表明，该模型能够预测给定OEI条件下DD6合金的屈服强度，可接受误差小于5%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.