High cycle fatigue properties of Ti-48Al-2Cr-2Nb alloy additively manufactured via twin-wire directed energy deposition-arc

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Materials Characterization Pub Date : 2024-11-05 DOI:10.1016/j.matchar.2024.114526

Wenlu Zhou , Chen Shen , Lin Wang , Ting Zhang , Ying Li , Jianwen Xin , Yuelong Zhang , Fang Li , Yuhan Ding , Kanglong Wu , Danqi Zhang , Xueming Hua

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Abstract

Recently, additive manufacturing for titanium aluminide has received sustained attention. Considering the extensive applications on low pressure turbine blades in aerospace field, dynamic mechanical properties of titanium aluminide, especially the fatigue properties, are of great importance. In present work, fatigue test at ambient temperature was conducted for the first time on twin-wire directed energy deposition-arc (TW-DED-arc) fabricated Ti-48Al-2Cr-2Nb alloy with equiaxed lamellar colonies. More detailed researches on fatigue fracture characteristics and deformation modes are also investigated. The experiment results indicate that TW-DED-arc fabricated Ti-48Al-2Cr-2Nb alloy exhibits flat S–N behavior with a good resistance to fatigue. Fatigue life fluctuates widely at same stress level, but such fluctuations gradually weaken as stress decreases. Furthermore, γ/α₂ interface and lamellar colony boundary as well as special microstructures of as-fabricated Ti-48Al-2Cr-2Nb alloy are weak areas during fatigue process, which easily become crack nucleation sites. As stress level decreases, deformation mode of as-fabricated Ti-48Al-2Cr-2Nb alloy translates from twinning and dislocation slip to predominantly dislocation slip. In general, these findings provide an important reference for engineering applications of titanium aluminide.

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通过双丝定向能沉积-电弧添加制造的 Ti-48Al-2Cr-2Nb 合金的高循环疲劳特性

最近，铝钛合金的增材制造技术受到了持续关注。考虑到低压涡轮叶片在航空航天领域的广泛应用，铝钛合金的动态机械性能，尤其是疲劳性能，显得尤为重要。在本研究中，首次对双丝定向能沉积电弧（TW-DED-arc）制造的具有等轴片状菌落的 Ti-48Al-2Cr-2Nb 合金进行了环境温度下的疲劳测试。此外，还对疲劳断裂特性和变形模式进行了更详细的研究。实验结果表明，TW-DED-电弧制造的 Ti-48Al-2Cr-2Nb 合金表现出平坦的 S-N 行为，具有良好的抗疲劳性。在相同应力水平下，疲劳寿命波动较大，但随着应力的减小，这种波动逐渐减弱。此外，Ti-48-Al-2Cr-2Nb 合金的 γ/α2 界面和片状集落边界以及特殊的微观结构是疲劳过程中的薄弱区域，容易成为裂纹成核点。随着应力水平的降低，成品 Ti-48Al-2Cr-2Nb 合金的变形模式从孪生和位错滑移转变为以位错滑移为主。总之，这些发现为铝化钛的工程应用提供了重要参考。

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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.