Effect of Ultrasonic Surface Impact on the Fatigue Properties of Ti3Zr2Sn3Mo25Nb

Cheng, Zhangjianing; Cao, Xiaojian; Xu, Xiao Le; Shen, Qiangru; Yu, Tian-chong; Jin, Jiang

doi:10.3390/ma13092107

Cited by 7 publications

(2 citation statements)

References 31 publications

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“…For the near β titanium alloy TLM, inner crack cores usually form at the junction of crystals. In the crack initiation zone, slip bands are obviously observed in the deformed α-phases or nearby the triple grain boundary junction [ 28 ]. The fatigue stress intensity factor calculated with the Murakami theory is a little higher because the size of the facet area is large with a long narrow shape of ellipse.…”

Section: Resultsmentioning

confidence: 99%

Influence of Fine Grains on the Bending Fatigue Behavior of Two Implant Titanium Alloys

Cao

Zhu

Gao³

et al. 2020

Materials

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By means of the ultrasonic surface impact (amplitude of 30 μm, strike number of 48,000 times/mm2), nanograins have been achieved in the surfaces of both Ti6Al4V(TC4) and Ti3Zr2Sn3Mo25Nb(TLM) titanium alloys, mainly because of the dislocation motion. Many mechanical properties are improved, such as hardness, residual stress, and roughness. The rotating–bending fatigue limits of TC4 and TLM subjected to ultrasonic impact are improved by 13.1% and 23.7%, separately. Because of the bending fatigue behavior, which is sensitive to the surface condition, cracks usually initiate from the surface defects under high stress amplitude. By means of an ultrasonic impact tip with the size of 8 mm, most of the inner cracks present at the zone with a depth range of 100~250 μm in the high life region. The inner crack core to TC4 usually appears as a deformed long and narrow α-phase, while the cracks in TLM specimens prefer to initiate at the triple grain boundary junctions. This zone crosses the grain refined layer and the deformed coarse grain layer. With the gradient change of elastic parameters, the model shows an increase of normal stress at this zone. Combined with the loss of plasticity and toughness, it is easy to understand these fatigue behaviors.

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Section: Resultsmentioning

confidence: 99%

Influence of Fine Grains on the Bending Fatigue Behavior of Two Implant Titanium Alloys

Cao

Zhu

Gao³

et al. 2020

Materials

Self Cite

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“…Ultrasonic impact treatment (UIT) is used to impact the surface of the metal component with high frequency, which makes the surface of the impacted components produce large compressive plastic deformation [6]. It can effectively eliminate the residual tensile stress on the surface of welded joint and weld zone, and achieve the effect of reducing the residual stress in welded parts [7,8]. After UIT, the wear and fatigue properties of tandem MIG welding can be effectively improved.…”

Section: Introductionmentioning

confidence: 99%

Effect of ultrasonic impact time on microstructure and properties of 7A52 aluminum alloy tandem MIG welded joint

Chen

Yang

2021

Int J Adv Manuf Technol

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7A52 (Al-Zn-Mg-Cu) alloy is a high-strength aluminum alloy, its welded joints are often accompanied by defects such as poor wear resistance and low fatigue strength. Herein, we try to optimize the welded joint of 7A52 aluminum alloy by using ultrasonic impact treatment (UIT). Generally, the mechanical properties such as microhardness and fatigue strength of the welded joint after UIT will be improved. 7A52 aluminum alloy tandem metal inert gas (MIG) welded joints with UIT time per unit area of 2.5 min, 5 min, 10 min, 15 min, 30 min, and 75 min were studied. Through the surface topography, microstructure observation, and mechanical properties test, the time parameters of excessive treatment, lack of treatment, and proper treatment were selected, and the effects of UIT, excessive treatment, lack of treatment, and proper treatment on fatigue strength were analyzed. Test results show that, the mechanical properties of welded joints after UIT are improved. The proper treatment time is 15min and its fatigue strength is 37.86MPa, respectively under the stress ratio of 0.1. Compared to the original welding condition with a fatigue strength of 28.61MPa, the fatigue strength of the welded joints of 7A52 aluminum alloy increased by 32.33%. The largest percentage of grain size reduction occurs when the UIT is 15 min. Moreover, excessive treatment and lack of treatment will not further re ne the grains and optimize the mechanical properties.

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Effect of Ultrasonic Impact on the Fatigue Properties of TC4 Titanium-Alloy Laser-Welded Joints

Yongzhen,

Jiahui,

Lei

et al. 2023

J. of Materi Eng and Perform

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Effect of Ultrasonic Surface Impact on the Fatigue Properties of Ti3Zr2Sn3Mo25Nb

Cited by 7 publications

References 31 publications

Influence of Fine Grains on the Bending Fatigue Behavior of Two Implant Titanium Alloys

Influence of Fine Grains on the Bending Fatigue Behavior of Two Implant Titanium Alloys

Effect of ultrasonic impact time on microstructure and properties of 7A52 aluminum alloy tandem MIG welded joint

Effect of Ultrasonic Impact on the Fatigue Properties of TC4 Titanium-Alloy Laser-Welded Joints

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