The effect of head hardening process on the residual stress of rails

Autor:	Muhammet Emre Turan, Yavuz Sun, Ibrahim Tozlu, Hayrettin Ahlatci, Fazil Husem, Sait Ozcelik
Rok vydání:	2016
Předmět:	020303 mechanical engineering & transports Materials science 0203 mechanical engineering Railhead Residual stress Mechanical Engineering Metallurgy Hardening (metallurgy) 020302 automobile design & engineering 02 engineering and technology Strain hardening exponent
Zdroj:	Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit. 232:589-595
ISSN:	2041-3017 0954-4097
Popis:	In this study, the head hardening process was employed, by using a mixture of air and water under laboratory conditions, to improve the residual stress behavior of R260 grade rails . For this purpose, three types of specimens were selected. One group of rails was heated up to the austenite stage and then cooled for 20 s; the next group was heated up to the austenite stage and then cooled for 40 s and the third group was not exposed to any heat treatment. The hardness results showed that the specimens cooled for 40 s had excessive hardness; the specimens cooled for 20 s exhibited similar properties as that of R350HT rail standards, which are especially preferred in the lower radius of curvature bends in railways, but not that of R260. According to the analysis of residual stress, all samples had compressive residual stress, but the specimens cooled for 20 s had the highest stress value.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a458bfae7105fd85011a52906806f994 https://doi.org/10.1177/0954409716679450 Zobrazit plný text záznamu