Wear Enhancement of Wheel-Rail Interaction by Ultrasonic NanocrystallineSurface Modification Technique

Collection with item attached
2017
Item details URL
http://open-repository.kisti.re.kr/cube/handle/open_repository/486982.do
DOI
10.3390/ma10020188
Title
Wear Enhancement of Wheel-Rail Interaction by Ultrasonic NanocrystallineSurface Modification Technique
Description
This study was financially supported through the R&D program of theKorea Railroad Research Institute. This study was also partiallyexperimentally supported by the Atomic Energy R&D Project through theMinistry of Science, ICT and Future Planning (NRF-2014M2A8A2074099).
abstract
In this study, an ultrasonic nanocrystalline surface modification (UNSM) technique was applied to normal and heat-treated rails made of 60 kgK steel to enhance the wear resistance of the wheel-rail interaction. The hardness and compressive residual stress values of the untreated and UNSM-treated rails were measured by the Brinell hardness tester and X-ray diffraction technique, respectively. It was found, according to the measurement results, that the hardness was increased by about 20% and 8%, whereas the compressive residual stress was induced by about 52% and 62% for the UNSM-treated normal and heat-treated rails, respectively. The UNSM-treated normal rail showed a slightly higher hardness than the heat-treated rail. The wear resistance of rails with respect to rotating speed and rolling time was assessed using a rolling contact wear (RCW) tester under dry conditions. The RCW test results revealed that the wear of the UNSM-treated rails was enhanced in comparison with those of the untreated rails. Also, the wear amount of the rails was increased with increasing the rotation speed. The UNSM-treated normal rail exhibited the highest wear resistance with respect to the rotation speed. The wear mechanisms of the rails are also discussed based on microscopic images of the worn out surfaces.
provenance
Made available in Cube on 2018-09-28T16:22:07Z (GMT). No. of bitstreams: 0
language
English
author
Chang, Seky
Pyun, Young-Sik
Amanov, Auezhan
accessioned
2018-09-28T16:22:07Z
available
2018-09-28T16:22:07Z
issued
2017
citation
MATERIALS(10): 2
issn
1996-1944
uri
http://open-repository.kisti.re.kr/cube/handle/open_repository/486982.do
Funder
과학기술정보통신부
Funding Program
한국철도기술연구원연구운영비지원
Project ID
1711062214
Jurisdiction
Rep.of Korea
Project Name
철도 레일의 용접 - 나노 표면 개질 처리 복합장치 개발
rights
openAccess
subject
60 kgK rail material
hardness
compressive residual stress
wearresistance
UNSM 5
type
article


Files in This Item

There are no attached files.