The influence of Ti and Nb on solidification cracking of ferritic stainless steels, as determined using self-restrained samples

dc.contributor.authorKonadu, David Sasu
dc.contributor.authorPistorius, Pieter Georg Hendrik
dc.contributor.authorDu Toit, M.
dc.date.accessioned2019-07-16T08:19:05Z
dc.date.issued2019-06
dc.description.abstractThe susceptibility to solidification cracking of ferritic stainless steels was studied using the self-restrained method. The unstabilised steel was compared with mono and dual stabilised (Ti and/or Nb) steels. Autogenous gas tungsten arc welding at a speed of 6 mm/s, 3 mm/s, and 1 mm/s was done. All the specimens cracked at a welding speed of 6 mm/s. The weld metal of both the unstabilised and the stabilised steels contained a mixture of columnar and equiaxed grains. At a welding speed of 3 mm/s, all the specimens except the unstabilised grade cracked. The weld metal microstructures were mostly columnar, and the dual stabilised grades showed equiaxed grains. At a welding speed of 1 mm/s, the Nb stabilised and the dual stabilised steel containing Mo cracked whilst the other alloys did not crack. At a welding speed of 1 mm/s, the weld metal was dominated by columnar grains. The cracks were interdendritic. The crack surfaces were enriched in Nb, Ti, Mn, Si, Al, Mn, and Mo. The unstabilised ferritic stainless steel was resistant to solidification cracking whilst the stabilised steels were not. Low melting point eutectic phases associated with Ti and Nb might have contributed to solidification cracking.en_ZA
dc.description.departmentMaterials Science and Metallurgical Engineeringen_ZA
dc.description.embargo2020-06-04
dc.description.librarianhj2019en_ZA
dc.description.sponsorshipOffice of Research, Innovation, and Development (ORID), University of Ghana, Department of Research and Innovation Support (DRIS), and Department of Welding Engineering, both of University of Pretoria.en_ZA
dc.description.urihttps://link.springer.com/journal/40194en_ZA
dc.identifier.citationKonadu, D.S., Pistorius, P.G.H. & Du Toit, M. The influence of Ti and Nb on solidification cracking of ferritic stainless steels, as determined using self-restrained samples. Welding in the World (2019). https://doi.org/10.1007/s40194-019-00757-6. NYP.en_ZA
dc.identifier.issn0043-2288
dc.identifier.other10.1007/s40194-019-00757-6
dc.identifier.urihttp://hdl.handle.net/2263/70722
dc.language.isoenen_ZA
dc.publisherSpringeren_ZA
dc.rights© International Institute of Welding 2019. The original publication is available at : https://link.springer.com/journal/40194.en_ZA
dc.subjectSolidification crackingen_ZA
dc.subjectFerritic stainless steelen_ZA
dc.subjectMicrostructureen_ZA
dc.subjectGas tungsten arc weldingen_ZA
dc.subjectGas metal arc weldingen_ZA
dc.subjectGas weldingen_ZA
dc.subjectTexturesen_ZA
dc.subjectWeldsen_ZA
dc.subjectColumnar grainen_ZA
dc.subjectWelding speeden_ZA
dc.subjectLow melting pointen_ZA
dc.subjectEutectic phasisen_ZA
dc.subjectEqui-axed grainsen_ZA
dc.subjectCrack surfacesen_ZA
dc.subject.otherEngineering, built environment and information technology articles SDG-09
dc.subject.otherSDG-09: Industry, innovation and infrastructure
dc.subject.otherEngineering, built environment and information technology articles SDG-12
dc.subject.otherSDG-12: Responsible consumption and production
dc.titleThe influence of Ti and Nb on solidification cracking of ferritic stainless steels, as determined using self-restrained samplesen_ZA
dc.typePostprint Articleen_ZA

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