Fatigue properties of a S45C steel subjected to ultrasonic nanocrystal surface modification

Cao, Xiaojian; Pyoun, Young-Sik; Murakami, Ri-ichi

doi:10.1016/j.apsusc.2010.04.007

Cited by 145 publications

(61 citation statements)

References 21 publications

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“…The principle of UNSM is introduced in reference [8]. An ultrasonic vibratory energy at a frequency of 20 kHz is used, and tens of thousands of strikes per second are applied to the material surface as constant pressure [17]. These strikes cause SPD to the surface layer and induce a certain depth of nanocrystal structure.…”

Section: Methodsmentioning

confidence: 99%

“…The generation of dislocations, twinning, and development of grain boundaries with high angle misorientation are considered as the mainly reasons. The above techniques have been shown to improve the tensile strength [4], hardness [8,14], residual stress [4,8,14], wear resistance [8,13,14], and especially fatigue properties [8,[15][16][17] of materials.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Ultrasonic Surface Impact on the Fatigue Behavior of Ti-6Al-4V Subject to Simulated Body Fluid

Cao

Wang

et al. 2017

Metals

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Abstract:The effect of ultrasonic nanocrystal surface modification (UNSM) on the fatigue behavior of Ti6Al4V (TC4) in simulated body fluid (SBF) was investigated. UNSM with the condition of a static load of 25 N, vibration amplitude of 30 µm and 36,000 strikes per unit produced about 35 µm surface severe plastic deformation (SPD) layers on the TC4 specimens. One group was treated with a hybrid surface treatment (UNSM + TiN film). UNSM technique improves the micro hardness and the compressive residual stress. The surface roughness is increased slightly, but it can be remarkably improved by the TiN film. The fatigue strength of TC4 is improved by about 7.9% after UNSM. Though the current density of corrosion is increased and the pitting corrosion is accelerated, UNSM still improved the fatigue strength of TC4 after pre-soaking in SBF by 10.8%. Interior cracks initiate at the deformed carbide and oxide inclusions due to the ultrasonic impacts of UNSM. Corrosion products are always observed at the edge of fracture surface to both interior cracks and surface cracks. Coating a TiN film on the UNSMed surface helps to improve the whole properties of TC4 further.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Ultrasonic Surface Impact on the Fatigue Behavior of Ti-6Al-4V Subject to Simulated Body Fluid

Cao

Wang

et al. 2017

Metals

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“…Because the occurrence of all of these faults is closely connected to metal surface properties, surface enhancement is often performed to improve the surface properties of metal products. Increasing surface roughness, strength [1,2], abrasion resistance, corrosion resistance [3][4][5], residual stress [6][7][8][9][10][11][12], and fatigue properties [8,9,13] are all types of surface enhancement that can be achieved using various technological means. Compared to other methods for improving the longevity of metal materials, surface treatment is a promisingly low-cost and particularly effective process that enhances the overall quality of metal materials.…”

Section: Introductionmentioning

confidence: 99%

“…One method of S 2 PD, UNSM [8,[24][25][26][27][28], has been used to enhance surface properties by producing gradient changes in the grain refinement of a material's surface. In terms of equipment, UNSM requires an ultrasonic generator, an air compressor, a control card, and a guide unit (Fig.…”

Section: Introductionmentioning

confidence: 99%

An investigation of ultrasonic nanocrystal surface modification machining process by numerical simulation

Zhang

et al. 2015

Advances in Engineering Software

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“…The crack initiation mechanism of axial symmetric tension-compression fatigue is different from that of rotating bending fatigue. All of the cracks initiate from the surface of S45C specimens after UNSM, which are subjected to rotating bending fatigue [30]. A nano-structured layer is achieved on the surface of the surface self-nanocrystallized (SSN) specimen.…”

Section: Fatigue Fracture Characteristicsmentioning

confidence: 99%

Fatigue Fracture Characteristics of Ti6Al4V Subjected to Ultrasonic Nanocrystal Surface Modification

Cao

et al. 2018

Metals

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Abstract:The influence of ultrasonic nanocrystal surface modification (UNSM) on the fatigue fracture characteristics of Ti6Al4V was investigated. Two groups of specimens were separated due to different heat treatment conditions. Group one was stress-relief annealed at 650 • C, and group two was then treated with solid solution-aging. UNSM with the conditions of a static load of 25 N, vibration amplitude of 30 µm, and 36,000 strikes per unit produced about 40 µm surface severe plastic deformation (SPD) layers on both groups of specimens. UNSM improved the microhardness and the compressive residual stress. UNSM also helped achieve a neat surface, almost without changing the surface roughness. The fatigue strengths of these two groups were improved by 7% and 11.7%, respectively. After UNSM, fatigue cracks mainly initiated from the surface of the specimen before the fatigue life of 10 6 cycles, while they appeared at the internal compress deformed α-phase at the zone between the SPD layer and the core after the fatigue life of 106 cycles. The cracks usually extended along the deformation overflow bands and the process traces on the surface. Through the change of micro-dimples in the fatigue final rupture region, nanocrystals were achieved in the SPD layer. The crystal slip and the surface remodeling together influenced the energy field of crack evolution.

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Fatigue properties of a S45C steel subjected to ultrasonic nanocrystal surface modification

Cited by 145 publications

References 21 publications

Effect of Ultrasonic Surface Impact on the Fatigue Behavior of Ti-6Al-4V Subject to Simulated Body Fluid

Effect of Ultrasonic Surface Impact on the Fatigue Behavior of Ti-6Al-4V Subject to Simulated Body Fluid

An investigation of ultrasonic nanocrystal surface modification machining process by numerical simulation

Fatigue Fracture Characteristics of Ti6Al4V Subjected to Ultrasonic Nanocrystal Surface Modification

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