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http://dx.doi.org/10.5574/KSOE.2011.25.6.042

Variation of Axial Tension-Compression Fatigue Characteristics by UNSM on Ti-6Al-4V  

Suh, Chang-Min (School of Mechanical Engineering, Kyungpook National University)
Cho, Sung-Am (Department of Prosthodontic, College of Dentistry, Kyungpook National University)
Pyoun, Young-Sik (School of Mechanical Engineering, Sun Moon University)
Suh, Min-Soo (School of Advanced Materials Engineering, Kookmin University)
Publication Information
Journal of Ocean Engineering and Technology / v.25, no.6, 2011 , pp. 42-48 More about this Journal
Abstract
The present study makes three original contributions to nanoskinned Ti-6Al-4V materials. The nanoskins were fabricated on Ti-6Al-4V material using various surface treatments: deep rolling (DR), laser shot peening (LSP), and ultrasonic nanocrystal surface modification (UNSM). These surface treatments are newly developed techniques and are becoming more popular in industrial fields. A fatigue strength comparison at up to 106 cycles was conducted on these nanoskinned Ti-6Al-4V materials. Fatigue tests were carried out using MTS under axial loading tension-compression fatigue (R = -1, RT, 5 Hz, sinusoidal wave). The analysis of the crack initiation patterns in the nanoskinned Ti-6Al-4V materials found an interior originating crack pattern and surface originating crack type. Microscopic observation was mainly used to investigate the fatigue fractured sites. These surface modification techniques have been widely adopted, primarily because of the robust grade of their mechanical properties. These are mainly the result of the formation of a large-scale, deep, and useful compressive residual stress, the formation of nanocrystals by the severe plastic deformation (SPD) at the subsurface layer, and the increase in surface hardness.
Keywords
Axial loading tension-compression fatigue test; S-N curve; UNSM (Ultrasonic nanocrystal surface modification) technology; Fish eye crack; Facet; Compressive residual stress;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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