Studies on surface integrity and fatigue performance of Ti-17 alloy induced by ultrasonic surface rolling process

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology Pub Date : 2025-05-27 DOI:10.1016/j.surfcoat.2025.132336

Liang Tan, Wenhao Tang, Manqi Wang, Yufei Zhang, Changfeng Yao

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引用次数: 0

Abstract

The surface integrity and fatigue performance of Ti-17 titanium alloy under different ultrasonic surface rolling (USR) process are investigated, the fatigue fracture morphologies are compared and analyzed. The results show that USR process enhances the surface integrity characteristics of the Ti-17 titanium alloy specimen. The surface roughness R_a values of the USR treated specimens are <0.3 μm, and the surface stress concentration coefficients are within the range of 1.009 to 1.028. USR process induces a compressive residual stress affected layer of 100 to 500 μm, a work-hardened layer of 100 to 300 μm, and a gradient microstructure. The average fatigue life of the U01# treated specimen with better surface integrity characteristics is approximately 9.7 times higher than that of U06# treated specimen. Observing the fatigue fractures, the fatigue crack initiation positions of the USR treated specimen are located on the subsurface at a distance of 200 to 500 μm from the surface. The fatigue crack initiation is linked to the stress concentration resulting from internal material defects and the uneven distribution of residual stress. The fatigue crack growth rate is relatively stable for the USR treated specimens with longer fatigue life. The crack initiation life of the USR treated specimens exceeds 90 % of their total fatigue life due to the improved surface integrity characteristics. The improvement of USR process on the rotating bending fatigue performance of Ti-17 titanium alloy is mainly reflected in the prevention of crack initiation and delay of crack propagation.

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超声表面轧制Ti-17合金表面完整性及疲劳性能研究

研究了不同超声表面轧制工艺下Ti-17钛合金的表面完整性和疲劳性能，并对其疲劳断口形貌进行了对比分析。结果表明，USR处理提高了Ti-17钛合金试样的表面完整性特征。USR处理试样的表面粗糙度Ra值为0.3 μm，表面应力集中系数在1.009 ~ 1.028之间。USR工艺形成了100 ~ 500 μm的残余压应力影响层、100 ~ 300 μm的加工硬化层和梯度组织。表面完整性较好的U01#处理试样的平均疲劳寿命约为U06#处理试样的9.7倍。观察疲劳断裂，USR处理试样的疲劳裂纹起裂位置位于距表面200 ~ 500 μm的亚表面。疲劳裂纹的萌生与材料内部缺陷引起的应力集中和残余应力分布不均匀有关。USR处理后试样的疲劳裂纹扩展速率相对稳定，疲劳寿命较长。由于表面完整性特性的改善，USR处理试样的裂纹起裂寿命超过其总疲劳寿命的90%。USR工艺对Ti-17钛合金旋转弯曲疲劳性能的改善主要体现在防止裂纹萌生和延缓裂纹扩展上。

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来源期刊

Surface & Coatings Technology 工程技术-材料科学：膜

CiteScore

10.00

自引率

11.10%

发文量

921

审稿时长

19 days

期刊介绍： Surface and Coatings Technology is an international archival journal publishing scientific papers on significant developments in surface and interface engineering to modify and improve the surface properties of materials for protection in demanding contact conditions or aggressive environments, or for enhanced functional performance. Contributions range from original scientific articles concerned with fundamental and applied aspects of research or direct applications of metallic, inorganic, organic and composite coatings, to invited reviews of current technology in specific areas. Papers submitted to this journal are expected to be in line with the following aspects in processes, and properties/performance: A. Processes: Physical and chemical vapour deposition techniques, thermal and plasma spraying, surface modification by directed energy techniques such as ion, electron and laser beams, thermo-chemical treatment, wet chemical and electrochemical processes such as plating, sol-gel coating, anodization, plasma electrolytic oxidation, etc., but excluding painting. B. Properties/performance: friction performance, wear resistance (e.g., abrasion, erosion, fretting, etc), corrosion and oxidation resistance, thermal protection, diffusion resistance, hydrophilicity/hydrophobicity, and properties relevant to smart materials behaviour and enhanced multifunctional performance for environmental, energy and medical applications, but excluding device aspects.