TRIBOLOGICAL PROPERTIES OF RAIL STEEL IN STRAIGHT MODERATELY LOADED SECTIONS OF RAILWAY TRACKS

摘要

The paper describes the examination results of tribological properties of three types of steels used and suggested for rails manufacturing. The tests concentrated on loads, sliding and rolling speeds similar to those occurring in real conditions i.e. rolling track operation. Average loaded conditions were assumed and applied at straight railway track sections. Slight track declivity and high/low speeds of locomotive were considered. “Amsler” stand was used for laboratory tests. Three types of steels i.e. two pearlitic steels: WHT – without heat treatment, HT – with heat treatment (with the microstructure of fine pearlite) as well as one bainitic steel suggested for rail production have been tested. The measurements of wear, hardness, friction coefficient as well as structural changes at surface layers of the tested rollers have been performed during the test.