The influence of tempering on the corrosion resistance of newly developed steels

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dc.contributor.advisorBall, Anthonyen_ZA
dc.contributor.authorJoubert, K Jen_ZA
dc.date.accessioned2016-09-20T12:25:02Z
dc.date.available2016-09-20T12:25:02Z
dc.date.issued1989en_ZA
dc.descriptionBibliography: pages 105-113.en_ZA
dc.description.abstractThis thesis deals with the effect of heat treatment on the localized corrosion resistance of the low carbon, chromium containing steels, designated 825, 102A and 122 which recently have been developed. The potentiodynamic polarization technique has been employed to determine the corrosion characteristics of the three steels. The results do not accurately reflect the effect heat treatment has on corrosion rates but scanning electron microscopy of corroded surfaces does allow a characterization. Both tempering temperature and time at temperature have a significant influence on the corrosion behaviour of chromium steels because the type, size and morphology of carbide precipitates are determined by the temperature and time of temperi ng. Localized pitting corrosion predominates for specimens tempered at temperatures below 450°C. Intergranular corrosion together with general corrosion occur after tempering at temperatures. in excess of 450°C. The resul ts of hardness tests show that secondary hardeni ng occurs after tempering between 450°C and 600°C. Secondary hardening suggests the presence of chromium carbides which deplete the surrounding matrix of chromium leaving it susceptible to active general corrosion (within the grains) and intergranular corrosion (at grain boundaries). A model showing the effect that 12% chromium, in comparison to 8% chromium, has on the corrosion resistance, is proposed. The significance of these results with regard to the application of the steels is discussed.en_ZA
dc.identifier.apacitationJoubert, K. J. (1989). <i>The influence of tempering on the corrosion resistance of newly developed steels</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Centre for Materials Engineering. Retrieved from http://hdl.handle.net/11427/21797en_ZA
dc.identifier.chicagocitationJoubert, K J. <i>"The influence of tempering on the corrosion resistance of newly developed steels."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Centre for Materials Engineering, 1989. http://hdl.handle.net/11427/21797en_ZA
dc.identifier.citationJoubert, K. 1989. The influence of tempering on the corrosion resistance of newly developed steels. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Joubert, K J AB - This thesis deals with the effect of heat treatment on the localized corrosion resistance of the low carbon, chromium containing steels, designated 825, 102A and 122 which recently have been developed. The potentiodynamic polarization technique has been employed to determine the corrosion characteristics of the three steels. The results do not accurately reflect the effect heat treatment has on corrosion rates but scanning electron microscopy of corroded surfaces does allow a characterization. Both tempering temperature and time at temperature have a significant influence on the corrosion behaviour of chromium steels because the type, size and morphology of carbide precipitates are determined by the temperature and time of temperi ng. Localized pitting corrosion predominates for specimens tempered at temperatures below 450°C. Intergranular corrosion together with general corrosion occur after tempering at temperatures. in excess of 450°C. The resul ts of hardness tests show that secondary hardeni ng occurs after tempering between 450°C and 600°C. Secondary hardening suggests the presence of chromium carbides which deplete the surrounding matrix of chromium leaving it susceptible to active general corrosion (within the grains) and intergranular corrosion (at grain boundaries). A model showing the effect that 12% chromium, in comparison to 8% chromium, has on the corrosion resistance, is proposed. The significance of these results with regard to the application of the steels is discussed. DA - 1989 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1989 T1 - The influence of tempering on the corrosion resistance of newly developed steels TI - The influence of tempering on the corrosion resistance of newly developed steels UR - http://hdl.handle.net/11427/21797 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/21797
dc.identifier.vancouvercitationJoubert KJ. The influence of tempering on the corrosion resistance of newly developed steels. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Centre for Materials Engineering, 1989 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/21797en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentCentre for Materials Engineeringen_ZA
dc.publisher.facultyFaculty of Engineering and the Built Environment
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherSteel - Heat treatmenten_ZA
dc.subject.otherSteel - Corrosionen_ZA
dc.subject.otherSteel - Metallurgyen_ZA
dc.subject.otherMaterials Engineeringen_ZA
dc.titleThe influence of tempering on the corrosion resistance of newly developed steelsen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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