通过工艺定制边界工程提高双相钛合金耐高温疲劳性能

IF 6.8 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2025-07-26 DOI:10.1016/j.ijfatigue.2025.109195

Yang Wang , Xian-zhe Ran , Hai Wang , Xu Cheng , Shao-yong Zhi , Dong Liu , Hua-ming Wang

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引用次数: 0

摘要

研制用于航空航天推进系统的高温钛合金，需要在高温载荷条件下具有良好的热稳定性和抗疲劳性能。对比研究了激光定向能沉积增材制造（AM）和常规锻造工艺制备Ti-6Al-4Zr-4Mo-2Sn-1W-0.2Si双相钛合金的显微组织特征和疲劳性能。结果表明：锻造钛合金晶粒细小，晶粒由大尺寸近球形初生α相和硬βt相组成，为非均匀双相组织；相比之下，AMed钛合金的柱状晶粒内部呈均匀的篮织结构，含有少量不稳定的高角边界（HABs）和高比例的低角边界（LABs）。虽然两种合金的室温抗拉强度相似（~ 1100 MPa），但AMed钛合金的高温力学性能优于锻造合金（882比811 MPa），在550℃时的强度保持比锻造合金高8%。随着总应变幅值的增大（Δεt），试样的疲劳寿命趋于降低，这与（0 0 0 1）[1 1 2¯0]基底滑移体系织构强度和活度下降有关。在Δεt = 0.6%的条件下，合金的高温疲劳寿命是锻造合金的6 ~ 7倍。疲劳试样的断口分析表明，表面滑移开裂伴随氧化物形成是主要的疲劳裂纹起裂机制，其次是裂纹扩展路径上的条纹。与锻造合金相比，AMed钛合金具有较高的疲劳性能，主要是由于其具有较高的热稳定性和优化的组织设计（较少的HABs和较高的lab比率），可以抵抗疲劳开裂。这些发现为航空航天应用中同时需要高温强度和抗疲劳性能的下一代钛合金的制造提供了指导。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Enhancing high-temperature fatigue resistance in duplex titanium alloys via process-tailored boundary engineering

查看原文本刊更多论文

Enhancing high-temperature fatigue resistance in duplex titanium alloys via process-tailored boundary engineering

The development of high-temperature titanium alloys for aerospace propulsion systems requires good thermostability and fatigue resistance under high temperature loading conditions. This study comparatively investigated the microstructural characteristics and fatigue performance of Ti-6Al-4Zr-4Mo-2Sn-1W-0.2Si duplex titanium alloys fabricated respectively via laser-directed energy deposition additive manufacturing (AM) and conventional forging technologies. The results revealed that the forged titanium alloy contained fine grains with a heterogeneously duplex structure consisting of large-size near-spherical primary α and hard β_t phases. By contrast, the AMed titanium alloy contained columnar grains with an interior homogenous basketweave structure containing a few unstable high angle boundaries (HABs) and a high ratio of low angle boundaries (LABs). Although the room-temperature tensile strengths of two types of alloys were similar (∼1100 MPa), the AMed titanium alloy suggested superior high temperature mechanical properties with 8 % higher strength retention at 550 °C than the forged alloy (882 vs. 811 MPa). With an increase of total strain amplitude (Δε_t), the fatigue life of the specimen was prone to decreasing, associated with the declined texture intensity and activity of basal slip system of (0 0 0 1) [1 1

\bar{2}

0]. Under the same Δε_t value of 0.6 %, the high temperature fatigue lives of the AMed alloys were 6–7 times longer than the forged counterparts. Fractographic analysis of the fatigue specimens revealed that surface slip cracking accompanied by oxide formation served as the predominant fatigue crack initiation mechanism, followed by striation patterns observed in crack propagation paths. Compared to the forged alloy, the higher fatigue properties of the AMed titanium alloy were mainly attributed to a higher thermostability and optimum microstructure design (fewer HABs and high ratio of LABs) resisting fatigue cracking. These findings offer a guide for the fabrication of next-generation titanium alloys requiring simultaneous high-temperature strength and fatigue resistance in aerospace applications.

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来源期刊

International Journal of Fatigue 工程技术-材料科学：综合

CiteScore

10.70

自引率

21.70%

发文量

619

审稿时长

58 days

期刊介绍： Typical subjects discussed in International Journal of Fatigue address: Novel fatigue testing and characterization methods (new kinds of fatigue tests, critical evaluation of existing methods, in situ measurement of fatigue degradation, non-contact field measurements) Multiaxial fatigue and complex loading effects of materials and structures, exploring state-of-the-art concepts in degradation under cyclic loading Fatigue in the very high cycle regime, including failure mode transitions from surface to subsurface, effects of surface treatment, processing, and loading conditions Modeling (including degradation processes and related driving forces, multiscale/multi-resolution methods, computational hierarchical and concurrent methods for coupled component and material responses, novel methods for notch root analysis, fracture mechanics, damage mechanics, crack growth kinetics, life prediction and durability, and prediction of stochastic fatigue behavior reflecting microstructure and service conditions) Models for early stages of fatigue crack formation and growth that explicitly consider microstructure and relevant materials science aspects Understanding the influence or manufacturing and processing route on fatigue degradation, and embedding this understanding in more predictive schemes for mitigation and design against fatigue Prognosis and damage state awareness (including sensors, monitoring, methodology, interactive control, accelerated methods, data interpretation) Applications of technologies associated with fatigue and their implications for structural integrity and reliability. This includes issues related to design, operation and maintenance, i.e., life cycle engineering Smart materials and structures that can sense and mitigate fatigue degradation Fatigue of devices and structures at small scales, including effects of process route and surfaces/interfaces.