增材制造和热等静压处理近无缺陷钛合金在不同温度下的高周疲劳性能

IF 6.8 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2025-09-30 DOI:10.1016/j.ijfatigue.2025.109311

X.Y. Teng , J.C. Pang , X.H. Peng , H. Zhang , S.X. Li , Z.F. Zhang

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引用次数: 0

摘要

钛合金的疲劳性能往往受到加工工艺缺陷的影响，特别是增材制造（AM）。采用增材制造和热等静压（HIP）工艺制备了一种近乎无缺陷的Ti-6.5Al-3.5Mo-1.5Zr-0.3Si （TC11）合金，研究了在无缺陷条件下测试温度对增材制造TC11合金拉伸和疲劳性能的影响。采用多尺度表征方法揭示其微观损伤机理。结果表明：随着测试温度的升高，AM TC11合金的抗拉强度逐渐降低，而当温度高于550℃时，加工硬化行为消失；500℃时的疲劳强度略高于400℃时的疲劳强度，这主要是由于温度和循环载荷引起的组织的动态演化过程。热挤压后，疲劳裂纹主要发生在表面的粗先验β增益边界（pbgb）处，而不是合金内部的气孔等缺陷处。基于金属材料抗拉强度和疲劳强度的一般关系，比较和讨论了几种钛合金在不同温度下力学性能的变化关系。

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High-cycle fatigue properties of near-defect-free titanium alloy treated by additive manufacturing and hot-isostatic pressing at different temperatures

The fatigue properties of titanium alloys are often compromised by defects in processing technology, especially for additive manufacturing (AM). A near-defect-free Ti-6.5Al-3.5Mo-1.5Zr-0.3Si (TC11) alloy was fabricated by AM and hot isostatic pressing (HIP) process to investigate the effects of testing temperatures on tensile and fatigue properties of the AM TC11 alloy under defect-free conditions. Multi-scale characterization methods were used to reveal its damage mechanism in the microstructure. The results show that the tensile strength of the AM TC11 alloy decreases gradually with increasing testing temperature, while the work-hardening behavior is lost when the temperature is above 550 ℃. The fatigue strength at 500 ℃ is slightly higher than that at 400 ℃, mainly due to the dynamic evolution process of the microstructure caused by temperature and cyclic loading. Fatigue cracks were found to initiate at the coarse prior β gains boundaries (PBGBs) on the surface rather than the defects such as pores in the alloy after HIP. The variation relations of the mechanical properties of several titanium alloys at different temperatures were compared and discussed based on the general relation between tensile strength and fatigue strength of metallic materials.

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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.