Effect of deformation on microsegregation in cast structure of bearing steel
2012 (English)In: TMS 2012 141st Annual Meeting & Exhibition - Supplemental Proceedings, Vol 2: Materials Properties, Characterization, And Modeling, 2012, Vol. 2, 309-316 p.Conference paper (Refereed)
Microsegregation changes in the cast structure of a five-ton ingot of ball bearing steel are investigated by a series of hot compression tests. Cylindrical specimens are deformed at a temperature range of 800 degrees C to 900 degrees C and strain rates of 0.5 s(-1). Samples are quenched after the compression in order to eliminate the homogenization time. Subsequently they are analysed with the aid of Electron Microprobe Analysis (EMPA) in order to investigate the effect of hot compression on microsegregation of Mo, Cr, Mn and Si. It is found that highly segregated regions are regions for formation of deformation bands. It seems that the degree of microsegregation increases by increasing the deformation. An attempt is made to estimate the diffusion coefficients of alloying elements during the deformation process. The increase of microsegregation during deformation is explained by tendency for uphill diffusion.
Place, publisher, year, edition, pages
2012. Vol. 2, 309-316 p.
, TMS Annual Meeting, 2
Cast structure, Diffusion, Microsegregation, Plastic deformation
Metallurgy and Metallic Materials
IdentifiersURN: urn:nbn:se:kth:diva-100062ISI: 000311607900040ScopusID: 2-s2.0-84860768504ISBN: 978-111829609-7OAI: oai:DiVA.org:kth-100062DiVA: diva2:542742
141st Annual Meeting and Exhibition, TMS 2012; Orlando, FL;11 March 2012 through 15 March 2012
QC 201208032012-08-032012-08-032013-11-04Bibliographically approved