A Study on the Ultrasonic Nano Crystal Surface Modification(UNSM) Technology and It's Application

Pyoun, Young-Sik; Park, Jeong-Hyeon; Cho, In-Ho; Kim, Chang Sik; Suh, Chang‐Min

doi:10.3795/ksme-a.2009.33.3.190

Cited by 9 publications

(2 citation statements)

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“…(3,4) 이 UNSM 기술을 적용하여 얻어진 기계적 물성 치 향상과 기대효과는 깊고 큰 압축잔류응력의 형 성, 표면의 미소 팀플형성, 표면경도 증가, 결정의 나노화 등의 특성으로 고사이클피로(HCF)와 기가 사이클피로(Very High cycle fatigue, VHCF), SCC(stress corrosion cracking) 등의 분야에서 피로강 도의 증가가 매우 크고, 마찰계수 감소로 마모특 성 향상 및 내마모성이 매우 좋아졌다. (3,4,6,7) 본 연구에서는 (2) 파단면상의 SEM 사진 Fig. 4(a)는 직경 6 mm 의 미처리재(624.2 MPa, N f =1×10 5 )의 파단면을 ×100 배율로 확대 관찰한 사진이다.…”

Section: <학술논문>unclassified

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Variation of Fatigue Properties in Nanoskinned Ti-6Al-4V - Rotating Bending and Axial Loading Tension-Compression Cycle -

Suh¹,

Pyoun²,

Suh³

2012

Transactions of the Korean Society of Mechanical Engineers A

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Nanoskins were fabricated on a Ti-6Al-4V material by carrying out various surface treatments, i.e., deep rolling, laser shot peening, and ultrasonic nanocrystal surface modification (UNSM). These surface treatments are newly developed techniques and are becoming more popular for industrial applications. Fatigue tests were carried out using material test system (MTS); these tests included the axial loading tension-compression fatigue test (R = −1, RT, 5 Hz, sinusoidal wave) and rotating bending fatigue test (R = −1, RT, 3200 rpm). The analysis of the crack initiation pattern in the UNSM-treated material indicated that the crack was interior originating in the axial loading tension-compression cycle, and was surface originating in the bending fatigue test. UNSM treatment significantly improved the fatigue strength for the regime of above 10 6 cycles that S-N curve of rotating bending stress clearly show the performance of a 5 mm titanium specimen after UNSM treatment is similar to that of an untreated 6 mm titanium specimen.

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Section: <학술논문>unclassified

“…3(a) A photo-mosaic of optical microscope; multifatigue cracks coalesced each other Fig. 1(b (3,4,6,7) 3.4.2 피로파단상의 특징 Fig. 6 은 응력조건(700 MPa, N f =1.13×10 5 )하의 피 로파단 된 경우로 어안균열(fish eye crack)이 2 개 생긴 경우를 나타내고 있다.…”

Section: <학술논문>unclassified