Article
Mechanics
Junnan Wu, Daoxin Liu, Yanying Guan, Hailan Shi, Shumin Cheng, Jianmeng Shi, Xueting He, Xiaoqiang Fu
Summary: The effect of shot peening forming (SPF) and shot peening strengthening (SPS) post-treatment on the surface integrity and fatigue behavior of 2024HDT alloy was investigated. The results showed that both treatments improved the fatigue resistance of the alloy, with SPF treatment changing the failure mode to plain fatigue and SPS treatment introducing a compressive residual stress field that suppressed the initiation and propagation of fatigue cracks.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Materials Science, Multidisciplinary
Xiaoming Yin, Xun Li, Yihang Liu, Daxi Geng, Deyuan Zhang
Summary: This study proposes an ultrasonic peening milling (UPM) technology that introduces ultrasonic impact to the machined surface during end milling. The results show that UPM can improve the surface quality, reduce surface defects, and create thicker stress-affecting layers, leading to a 16.1 times increase in the fatigue life of Inconel 718 compared to conventional milling.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Mechanical
Zhi Qin, Bin Li, Han Zhang, Tiako Youani Andre Wilfried, Tao Gao, Hongqian Xue
Summary: This study reviews the effect of shot peening coverage on the surface integrity and fatigue crack growth properties of an aluminum alloy. The results show that shot peening treatment improves surface roughness, increases microhardness, and induces compressive residual stresses. The coverage of shot peening has a limited effect on fatigue crack growth rate, with the lowest rate observed at 300% coverage.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Engineering, Mechanical
Xiaoming Yin, Yihang Liu, Shicai Zhao, Xun Li, Daxi Geng, Deyuan Zhang
Summary: Ultrasonic-assisted technology has been found to be effective for milling Inconel 718. This study compared tool life and wear mechanisms between high-speed Ultrasonic Peening Milling (UPM) and Conventional Milling (CM) under different wear states. The analysis showed a 32.5% increase in tool life in UPM due to lower tool wear compared to CM. More importantly, UPM significantly improved surface quality and fatigue life with an average increase of 4-17 times.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Santiago Aguado-Montero, Carlos Navarro, Jesus Vazquez, Fernando Lasagni, Sebastian Slawik, Jaime Dominguez
Summary: Additive manufacturing (AM) of metallic parts is a new manufacturing procedure that has been applied in various industries. However, AM parts often have internal defects and surface roughness, resulting in lower fatigue strength compared to materials produced by traditional processes. This study investigated different surface treatments, including shot peening, laser peening, and shot peening plus chemical assisted surface enhancement, to improve the fatigue strength of AM parts. The results showed that laser peening produced the best results, followed by shot peening plus CASE and shot peening.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Engineering, Mechanical
Bin Li, Hongqian Xue, Zhidan Sun, Zhi Qin, Han Zhang
Summary: The study showed that increasing the coverage of shot peening on a 7B75-T7751 alloy does not significantly improve residual stress levels beyond 300%, and the surface grain refinement slows down at 600% coverage. While higher coverage can enhance fatigue life, exceeding 300% leads to a significant drop in fatigue life due to micro-cracks on the surface.
SURFACE TOPOGRAPHY-METROLOGY AND PROPERTIES
(2021)
Article
Engineering, Mechanical
Yating Zhang, Kun Zhang, Zheng Hu, Tianyu Chen, Luca Susmel, Bingchen Wei
Summary: The synergetic effect of shot peening and laser shot peening on the fatigue behavior of a medium carbon steel was studied. The fatigue performance of the SP + LSP specimen was found to be improved only at lower stress levels, which is consistent with the observed short crack propagation behavior near the threshold region. The heterogeneous structures of ultra-fine grains, dislocation tangles, and high-angle grain boundaries were responsible for effectively retarding the short crack propagation.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Metallurgy & Metallurgical Engineering
Hitoshi Soyama, Chieko Kuji, Yiliang Liao
Summary: This study investigates the improvement in fatigue strength of magnesium alloy through peening methods including submerged laser peening (SLP), cavitation peening (CP), and shot peening (SP). The fatigue properties were evaluated by a plane bending fatigue test. The fatigue strengths of the SLP, CP, and SP specimens under optimum conditions were found to be 56%, 18%, and 16% higher, respectively, than the non-peened (NP) specimen, which had a fatigue strength of 97 MPa. The key factors contributing to the improvement in fatigue strength were work hardening and the introduction of compressive residual stress.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Materials Science, Multidisciplinary
Wenxue Qian, Yi Wang, Kexin Liu, Xiaowei Yin, Xuehong He, Liyang Xie
Summary: Shot peening is a surface peening technique that introduces residual compressive stresses to enhance the fatigue life of materials. However, stress relaxation and improper parameters can weaken its effectiveness. This study investigates the effects of shot peening pressure and coverage on fatigue life and the influence of re-shot peening on material fatigue life. The results highlight the significance of reasonable parameters and the positive impact of re-shot peening in restoring residual compressive stress and improving fatigue life.
Article
Materials Science, Multidisciplinary
Misato Nakamura, Koji Takahashi, Yuta Saito
Summary: The effects of shot peening and laser peening on the fatigue strength of additively manufactured aluminum alloy specimens were investigated. The results showed that both treatments significantly improved the fatigue strength and altered the surface roughness and waviness of the specimens. Fatigue cracks originated from defects and concave areas on the surface. Furthermore, the introduction of deep compressive residual stress by laser peening further increased the fatigue strength of the specimens.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Engineering, Mechanical
Piao Li, Luca Susmel, Mingze Ma
Summary: The study investigates the impact of Laser shock peening (LSP) on the fatigue life of notched metallic specimens. LSP is applied to notched specimens made of two aluminum alloys and fatigue tests are conducted. The stress field at the notch is measured using X-ray diffractometer and simulated using numerical methods. The highest compressive stress is found below the surface near the notch. A life prediction method is proposed by introducing the effective stress after LSP into the Theory of Critical Distances (TCD). The predicted results show good agreement with the experimental results.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Mechanics
Hang Li, Jiwang Zhang, Liukui Hu, Kaixin Su
Summary: Fracture mechanics and machine learning methods were used to predict the high cycle fatigue life of micro-shot peened 25CrMo4 alloy steel with artificial notches. The prediction model incorporated the effects of notch size, stress level, and surface condition. The results showed that shot-peened specimens had enhanced fatigue life due to compressive residual stress. The prediction using fracture mechanics had an error within +/- 2, while machine learning method had an error within +/- 1.5. Stress level and notch size were identified as the most critical factors affecting HCF fatigue life. The applicability and limitations of the two methods were discussed.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Materials Science, Multidisciplinary
Jiahao Zhu, Kai Liao, Jun Hu, Michal Kulka
Summary: This study investigates the effect of shot peening residual compressive stress on repairing surface cracks in the 7075-T651 aluminum alloy. Two models were developed for crack repair via shot peening and fatigue test finite element modeling. Increasing pressure and projectile size improve repair effectiveness, but higher pressure causes material damage, and larger projectiles decrease fatigue life. Crack repair effectiveness decreases with higher loading levels.
Article
Materials Science, Multidisciplinary
Liucheng Zhou, Xinlei Pan, Xiaosong Shi, Tianhan Du, Lingfeng Wang, Sihai Luo, Weifeng He, Peiming Chen
Summary: This paper investigated the effect of compound surface treatment of Laser shock peening and Shot peening on the strengthening of Ti-6A1-4V alloys. The results showed that the compound treatment had better effects on distribution of microhardness and residual stress, with surface hardness increase, compressive residual stress, and grain refinement observed.
Article
Engineering, Mechanical
Yalong Zhang, Jiakang Wang, Luji Wu, Zhen Wang, Le Liu, Vincent Ji, Shengguan Qu
Summary: The carburized treatment combined with shot peening was used to enhance the fatigue behavior of aeronautic gear steel. The study systematically analyzed the surface integrity and fatigue behavior after carburizing and combined treatment. The results showed that the combined treatment increased surface roughness, microhardness, and residual compressive stress, while reducing the average size of ultra-fine grains. The fatigue limit of the samples treated by combined treatment was increased from 720 MPa to 890 MPa compared to carburized samples. Additionally, higher shot peening jet pressure did not necessarily result in better fatigue limit. Residual compressive stress was identified as an important factor influencing fatigue crack propagation mode.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
