Creep Behavior and Fracture Mechanisms of the Dissimilar Inertia Friction Welded Joints of Deformed and Powder Metallurgy Ni-Based Superalloys

IF 3.1 2区材料科学 Q2 ENGINEERING, MECHANICAL Fatigue & Fracture of Engineering Materials & Structures Pub Date : 2024-10-27 DOI:10.1111/ffe.14494

Zixin Zhang, Qiang Zhao, Xiaoguang Li, Rui Zhan, Chunbo Zhang, Feng Qin, Hang Liang, Lei Cui, Yongchang Liu

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Abstract

In this research, the microstructure and precipitate characteristics of the dissimilar inertia friction welded (IFW) joints of deformed and powder metallurgy (PM) nickel-based superalloys were studied using optical, scanning electron, and transmission electron microscopy. In addition, several creep tests were conducted. The high-temperature mechanical properties of the IFW joints were systematically analyzed. Under the creep testing condition of 680°C, the specimens exhibited creep fracture at the thermomechanically affected zone (TMAZ) of the PM superalloys. Further, the failure lifetime is enhanced with a reduction in the applied creep loading. Owing to the IFW process, various γ′ precipitates and carbide distributions were observed in the various zones of a dissimilar IFW joint. Undissolved powder particle boundary (PPB) defects in the TMAZ of the PM superalloy initiated creep cracks under creep loading. Based on the experimental results and theoretical analysis, the creep fracture mechanisms of the dissimilar IFW joints were revealed. Thus, the findings of this study provide guidance for controlling the microstructures and properties of dissimilar deformed/PM nickel-based superalloy IFW joints.

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变形及粉末冶金镍基高温合金不同惯性摩擦焊接接头的蠕变行为及断裂机理

采用光学显微镜、扫描电子显微镜和透射电子显微镜研究了变形镍基高温合金和粉末冶金镍基高温合金不同惯性摩擦焊接（IFW）接头的显微组织和析出物特征。此外，还进行了一些蠕变试验。系统地分析了IFW接头的高温力学性能。在680℃蠕变试验条件下，试样在PM高温合金的热力学影响区（TMAZ）出现蠕变断裂。此外，随着施加蠕变载荷的减少，失效寿命也会延长。由于IFW过程，在不同IFW接头的不同区域观察到不同的γ′析出物和碳化物分布。蠕变载荷作用下，PM高温合金TMAZ中未溶解粉末颗粒边界（PPB）缺陷引发蠕变裂纹。基于实验结果和理论分析，揭示了不同类型IFW接头的蠕变断裂机理。因此，本研究结果为控制不同变形/PM镍基高温合金IFW接头的组织和性能提供了指导。

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来源期刊

Fatigue & Fracture of Engineering Materials & Structures 工程技术-材料科学：综合

CiteScore

6.30

自引率

18.90%

发文量

256

审稿时长

4 months

期刊介绍： Fatigue & Fracture of Engineering Materials & Structures (FFEMS) encompasses the broad topic of structural integrity which is founded on the mechanics of fatigue and fracture, and is concerned with the reliability and effectiveness of various materials and structural components of any scale or geometry. The editors publish original contributions that will stimulate the intellectual innovation that generates elegant, effective and economic engineering designs. The journal is interdisciplinary and includes papers from scientists and engineers in the fields of materials science, mechanics, physics, chemistry, etc.

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