레일의 내마모성에 대한 타당성 연구

초록

Rails are continuously exposed to severe environments due to increases in trainservice frequency, passing tonnage, and speed. Wear is one of the most commontypes of damage observed on rails. The surface of railsis heat treated to securesafety at critical sites, such as curved tracks or turnouts. Ultrasonic nanocrystalsurface modification (UNSM), a new approach for rails, was examined tostrengthen the rail surface. The effect of UNSM on the wear resistance of railspecimens was compared with that of heat treatment. Wear resistance wasimproved after UNSM treatment due to increased hardness and surfacecompressive residual stress.

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