표면 강화처리 레일의 마모 및 피로 특성

• Published in: 한국생산제조학회지 Vol. 25; no. 5; pp. 380 - 385
• Main Authors: 장세기(Seky Chang), 편영식(Young-Sik Pyun)
• Format: Journal Article
• Language: Korean
• Published: 한국생산제조학회 2016
• Subjects: 기계공학; Rolling contact fatigue; Normal rail; UNSM; Heat treated rail; Wear
• ISSN: 2508-5093; 2508-5107
• DOI: 10.7735/ksmte.2016.25.5.380

Railway tracks are repeatedly overstressed and damaged owing to increase in passing tonnage and numerous contact cycles between wheels of train and rails. In order to ensure safe train operation, heat-treated rails are used in addition to regular inspection and maintenance of these rails. Normal rails were treated using ultrasonic nanocrystal surface modification (UNSM) to strengthen the surface of rails. A few changes in surface properties were detected with respect to hardness and compressive residual stress after UNSM treatment. Wear and rolling contact fatigue tests were performed using rails whose surfaces were hardened by UNSM and heat-treated rails. The amount of wear and fatigue life cycles were measured to estimate the effect of UNSM on the rail material. The material of the surfacehardened rail showed improved wear and rolling contact fatigue properties.