Carbide composition and stress measurement in ethylene pyrolysis tubes

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dc.contributor.authorStevens, KJen_AU
dc.contributor.authorIngham, Ben_AU
dc.contributor.authorRyan, Men_AU
dc.contributor.authorLuzin, Ven_AU
dc.contributor.authorCheong, Ken_AU
dc.date.accessioned2021-10-08T01:06:12Zen_AU
dc.date.available2021-10-08T01:06:12Zen_AU
dc.date.issued2010-02-05en_AU
dc.date.statistics2021-09-06en_AU
dc.description.abstractEthylene is important in the production of polyethylene, used in thin film packaging, piping and cable sheathing. It is produced by steam cracking of naptha, LPG or ethane at temperatures around 950°C at high flow velocities. Carburisation of ethylene pyrolysis tubes (typically of nominal composition 31%Fe, 37%Ni and 25%Cr) causes a loss in weldability, corrosion resistance and ductility, and provides a source of micro-cracking. Plant operators prefer to replace tubes at planned outages and are interested in remaining life assessments assisted by description and modelling of the progress of carburisation. The powder diffraction beamline at the Australian Synchrotron has been used to radially scan mounted and polished tube sections prepared from ex-service carburised tubes. Radial dependence of carbide phases in the tubes is being quantified using Bruker TOPAS software for whole pattern line fitting. Composition analysis and microscopy is being used to create a representative microstructure in Abaqus Finite Element Analysis (FEA) models and to interpret non-destructive eddy current measurements [1] of carburisation. The austenite diffracting planes give a peak shift response to stress that is anisotropic and is being interpreted with FEA based crystal plasticity models. Neutron diffraction at the Kowari beamline at OPAL (Open Pool Australian Lightwater reactor) was used to measure strain in unsectioned tubes at room temperature. This was compared to FEA models of the strain created by differential thermal expansion between carbide phases and austenite, assuming creep relaxation at normal tube operating temperature.en_AU
dc.identifier.citationStevens, K. J., Ingham, B., Ryan, M., Luzin, V., & Cheong, K. (2010). Carbide composition and stress measurement in ethylene pyrolysis tubes. Poster presented to the 34th Annual Condensed Matter and Materials Meeting 2010, Waiheke Island Resort, Waiheke, Auckland, New Zealand 2 - 5 February 2010. Retrieved from: https://physics.org.au/wp-content/uploads/cmm/2010/en_AU
dc.identifier.conferenceenddate5 February 2010en_AU
dc.identifier.conferencename4th Annual Condensed Matter and Materials Meeting 2010en_AU
dc.identifier.conferenceplaceAuckland, New Zealanden_AU
dc.identifier.conferencestartdate2 February 2010en_AU
dc.identifier.isbn978-0-646-53897-6en_AU
dc.identifier.urihttps://physics.org.au/wp-content/uploads/cmm/2010/en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/11895en_AU
dc.language.isoenen_AU
dc.publisherAustralian Institute of Physicsen_AU
dc.subjectCarbidesen_AU
dc.subjectEthyleneen_AU
dc.subjectTubesen_AU
dc.subjectPolyethylenesen_AU
dc.subjectCablesen_AU
dc.subjectEthaneen_AU
dc.subjectTemperature range 0400-1000 Ken_AU
dc.subjectWeldabilityen_AU
dc.subjectCorrosionen_AU
dc.subjectCrackingen_AU
dc.subjectFinite element methoden_AU
dc.titleCarbide composition and stress measurement in ethylene pyrolysis tubesen_AU
dc.typeConference Posteren_AU
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