Improvement of the fatigue strength of SUS304 austenite stainless steel using ultrasonic nanocrystal surface modification

Yasuoka, Masahito; Wang, Pangpang; Zhang, Kaiyue; Qiu, Zhiyong; Kusaka, Kazuya; Pyoun, Young-Sik; Murakami, Ri Ichi

doi:10.1016/j.surfcoat.2012.12.033

Cited by 100 publications

(50 citation statements)

References 15 publications

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“…Therefore, the slow fall in the microhardness at these depths is only due to the plastic deformation layer. The amount of plastic deformation in this layer gradually decreases from large to small along the depth [16,27]. When the depth is greater than 110 lm, the microhardness is similar to that of the substrate, because there is no plastic deformation.…”

Section: Resultsmentioning

confidence: 97%

Novel method to fabricate Ti–Al intermetallic compound coatings on Ti–6Al–4V alloy by combined ultrasonic impact treatment and electrospark deposition

Liu

Wang

Deng

et al. 2015

Journal of Alloys and Compounds

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Section: Resultsmentioning

confidence: 97%

Novel method to fabricate Ti–Al intermetallic compound coatings on Ti–6Al–4V alloy by combined ultrasonic impact treatment and electrospark deposition

Liu

Wang

Deng

et al. 2015

Journal of Alloys and Compounds

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“…By means of UNSM, the intensity of characteristic peak α (101) is strengthened. The ultrasonic surface impact does not induce the phase change, as it is observed in stainless steel [23]. Taking the full width at half maximum (FWHM), the average grain size of the SPD layer can be calculated by the equation given by Scherrer and Wilson [24].…”

Section: Observation Of the Severe Plastic Deformation Layermentioning

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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“…최근 이 기술을 여러 분야 와 부품에 적용한 연구들이 활발히 수행되고 있으며 피로강도, 표 면거칠기, 경도 등 기계적 물성치 향상을 보여주고 있다 [1][2][3][4][5][6][7][8] . 이러 한 향상들은 정적 힘, 웨이브가이드의 진동 거리 및 주파수 등의 실험 조건들에 따라 달라지므로 체계적인 연구를 위해 UNSM을 위한 장치 개발이 필요하다.…”

Section: 서 론unclassified

“…이 장치는 Fig. 1과 같이 정적 힘을 가하는 공압장치, 초음파 발진장치, 초음파를 방출하는 진동자, 진 동자를 지그재그로 이송하는 스테이지, 시편 거치대 등으로 구성되 어 있다 [3] . 특히, 초음파 발진장치와 진동자는 UNSM 장치의 핵심 개발 장치로서 매우 중요하다.…”

Section: 서 론unclassified

Development of 20-kHz Ultrasonic Equipment for UNSM

Shin¹,

Kim²,

Lim³

2015

Journal of the Korean Society of Manufacturing Technology Engin

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ARTICLE INFO ABSTRACTArticle history:Ultrasonic nanocrystal surface modification (UNSM) is an example of a nanoscale-surface modification that has become noticeable because of its effects on the mechanical improvement of metallic materials. UNSM equipment needs to be both utilized and improved. The equipment is based on an ultrasonic waveguide whose role is to strike surfaces of metallic materials to achieve nanoscale deformation. In this paper, we introduce the development of one kind of UNSM equipment. Using piezoelectric elements, we repeatedly design and fabricate a 20-kHz ultrasonic waveguide. With respect to the composition of the equipment, the waveguide is automatically transferred by two axial stages automatically. In addition, a static force is constantly applied by pneumatic devices. We perform an experiment to verify the feasibility of the equipment.

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Improvement of the fatigue strength of SUS304 austenite stainless steel using ultrasonic nanocrystal surface modification

Cited by 100 publications

References 15 publications

Novel method to fabricate Ti–Al intermetallic compound coatings on Ti–6Al–4V alloy by combined ultrasonic impact treatment and electrospark deposition

Novel method to fabricate Ti–Al intermetallic compound coatings on Ti–6Al–4V alloy by combined ultrasonic impact treatment and electrospark deposition

Fatigue Fracture Characteristics of Ti6Al4V Subjected to Ultrasonic Nanocrystal Surface Modification

Development of 20-kHz Ultrasonic Equipment for UNSM

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