Optimising two-stage vacuum heat treatment for a high-strength micro-alloyed steel in railway spring clip application: impact on microstructure and mechanical performance

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dc.contributor.authorLu, Yao
dc.contributor.authorWang, Jun
dc.contributor.authorPan, Di
dc.contributor.authorHan, Jian
dc.contributor.authorZhu, Lisong
dc.contributor.authorDiao, Chenglei
dc.contributor.authorHan, Jingtao
dc.contributor.authorJiang, Zhengyi
dc.date.accessioned2023-07-12T14:01:55Z
dc.date.available2023-07-12T14:01:55Z
dc.date.issued2023-07-10
dc.description.abstractThe heat treatment process is a vital step for manufacturing high-speed railway spring fasteners. In this study, orthogonal experiments were carried out to obtain reliable optimised heat treatment parameters through a streamlined number of experiments. Results revealed that a better comprehensive mechanical performance could be obtained under the following combination of heat treatment parameters: quenching temperature of 850 °C, holding time of 35 min, medium of 12% polyalkylene glycol (PAG) aqueous solution, tempering temperature of 460 °C, and holding time of 60 min. As one of the most important testing criteria, fatigue performance would be improved with increasing strength. Additionally, a high ratio of martensite to ferrite is proven to improve the fatigue limit more significantly. After this heat treatment process, the metallographic microstructure and mechanical properties satisfy the technical requirements for the high-speed railway practical operation. These findings provide a valuable reference for the practical forming process of spring fasteners.en_UK
dc.identifier.citationLu Y, Wang J, Pan D, et al., (2023) Optimising two-stage vacuum heat treatment for a high-strength micro-alloyed steel in railway spring clip application: impact on microstructure and mechanical performance, Materials, Volume 16, Issue 14, July 2023, Article Number 4921en_UK
dc.identifier.issn1996-1944
dc.identifier.urihttps://doi.org/10.3390/ma16144921
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/19971
dc.language.isoenen_UK
dc.publisherMDPIen_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectSi-Cr spring steelen_UK
dc.subjectheat treatment optimisationen_UK
dc.subjectmicrostructureen_UK
dc.subjectmechanical propertyen_UK
dc.subjectfatigue performanceen_UK
dc.titleOptimising two-stage vacuum heat treatment for a high-strength micro-alloyed steel in railway spring clip application: impact on microstructure and mechanical performanceen_UK
dc.typeArticleen_UK

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