The potential for suppressing rail defect growth through tailoring rail thermo-mechanical properties

I., David and N., Fletcher and H. Sanusi, Shahmir (2016) The potential for suppressing rail defect growth through tailoring rail thermo-mechanical properties. Wear, 366-36. pp. 401-406. ISSN 0043-1648

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Abstract

Thermal damage of rails can occur through brake lock-up, or traction control system failure to prevent wheel spin. In most cases the damage produced is shallow and takes the form of a “white etching layer”, usually thought to have a martensitic structure, formed as the steel is heated above its eutectoid tem-perature and then rapidly cooled as the wheel moves away. In many cases such layers are benign, but there is evidence of crack initiation at their interface with the sub-surface layers of the rail in “stud” defects. The metallurgical transformation during the formation of white etching layers leads to a volume change for the steel, leaving not only a transformed microstructure, but also locked-in stress. The influence of this additional locked-in stress on development of an initiated crack is studied in this paper, and the work extended to consider how alternative materials which react differently to the thermal input may offer a means to suppress crack development through locking in beneficial rather than problematic stresses.

Item Type:	Article
Uncontrolled Keywords:	Railway; Rail–wheel; Contact; Crack; Thermal
Subjects:	T Technology > TF Railroad engineering and operation
Divisions:	Faculty of Engineering Technology > Department of Mechnical Engineering Technology
Depositing User:	Mrs. Siti Noraida Miskan
Date Deposited:	21 Nov 2021 07:57
Last Modified:	21 Nov 2021 07:57
URI:	http://eprints.uthm.edu.my/id/eprint/3704

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