Influences of depositing materials, processing parameters and heating conditions on material characteristics of laser-cladded hypereutectoid rails

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dc.contributor.authorLai, Qen_AU
dc.contributor.authorAbrahams, Ren_AU
dc.contributor.authorYan, Wen_AU
dc.contributor.authorQiu, Cen_AU
dc.contributor.authorMutton, PJen_AU
dc.contributor.authorParadowska, AMen_AU
dc.contributor.authorSoodi, Men_AU
dc.contributor.authorWu, Xen_AU
dc.date.accessioned2021-02-11T02:57:14Zen_AU
dc.date.available2021-02-11T02:57:14Zen_AU
dc.date.issued2019-01-01en_AU
dc.date.statistics2021-02-09en_AU
dc.description.abstractThe effects of different cladding materials, processing parameters and heating regimes on the underlying microstructural features and mechanical properties of laser-cladded premium rails were investigated by using a hypereutectoid rail grade as a substrate, which is extensively used in heavy-haul rail systems. Cladding materials of 410L, 420SS, Stellite 6 and Stellite 21 with single and double depositions were considered for the comparative study of different cladding materials and processing parameters. To ensure the constant thickness of the claddings for comparison purposes, transverse speed and powder feed rate were modified concurrently in the ranges of 1000–1200 mm/min and 3–4 RPM, respectively. Two heating conditions, i.e. preheating only (HTA) and a combination (HTB) of preheating and post weld heat treatment (PWHT) were applied after the preferable parameters for each cladding material were obtained. The most suitable cladding material for rail-wheel contact was established by assessing all crucial aspects, i.e. surface defects, hardness, microstructural and mechanical properties. Process parameters for each considered cladding material were determined to achieve no surface defects. For cladding layers, application of HTA was not able to significantly modify the microstructures of the deposits, whereas HTB was observed to cause severe cracks in Co-base alloys, i.e. Stellite 6 and Stellite 21. In the heat affected zones (HAZs), irrespective of the cladding materials, the formation of untempered martensite was not avoided by the application of preheating at 350 °C. Consequentially, cracking in the HAZ was observed. An uncracked and desirable microstructure in the HAZs was established using HTB, regardless of the depositing materials. The addition of a second layer did not change the thickness of the HAZs but refined the HAZ’s microstructures. Shear punch testing (SPT) and Vickers hardness testing were utilized to characterize mechanical properties for the considered cladding materials and good correlations with the obtained microstructural morphologies were shown. © 2018 Elsevier B.V.en_AU
dc.identifier.citationLai, Q., Abrahams, R., Yan, W., Qiu, C., Mutton, P., Paradowska, A., Soodi, M., & Wu, X. (2019). Influences of depositing materials, processing parameters and heating conditions on material characteristics of laser-cladded hypereutectoid rails. Journal of Materials Processing Technology, 263, 1-20. doi:10.1016/j.jmatprotec.2018.07.035en_AU
dc.identifier.issn0924-0136en_AU
dc.identifier.journaltitleJournal of Materials Processing Technologyen_AU
dc.identifier.pagination1-20en_AU
dc.identifier.urihttps://doi.org/10.1016/j.jmatprotec.2018.07.035en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/10371en_AU
dc.identifier.volume263en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectCladdingen_AU
dc.subjectLasersen_AU
dc.subjectMicrostructureen_AU
dc.subjectMechanical propertiesen_AU
dc.subjectAlloysen_AU
dc.subjectHardnessen_AU
dc.titleInfluences of depositing materials, processing parameters and heating conditions on material characteristics of laser-cladded hypereutectoid railsen_AU
dc.typeJournal Articleen_AU
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