hodgson-characterizationofthebake-2010.pdf (6.13 MB)
Characterization of the bake-hardening behavior of transformation induced plasticity and dual-phase steels using advanced analytical techniques
journal contribution
posted on 2010-01-01, 00:00 authored by Ilana Timokhina, E Pereloma, S Ringer, R Zheng, Peter HodgsonPeter HodgsonThe bake-hardening (BH) behavior of TRansformation Induced Plasticity (TRIP) and Dual-Phase (DP) steels after intercritical annealing (IA) has been studied using transmission electron microscopy, X-ray diffraction and three dimensional atom probe tomography. It was found for the DP steel that carbon can segregate to dislocations in the ferrite plastic deformation zones where there is a high dislocation density around the "asquenched" martensite. The carbon pinning of these dislocations, in turn, increases the yield strength after aging. It was shown that bake-hardening also leads to rearrangement of carbon in the martensite leading to the formation of rod-like low temperature carbides in the DP steel. Segregation of carbon to microtwins in retained austenite of the TRIP steel was also evident. These factors, in combination with the dislocation rearrangement in ferrite through the formation of cells and microbands in the TRIP steel after pre-straining, lead to the different bake-hardening responses of the two steels.
History
Journal
ISIJ internationalVolume
50Issue
4Pagination
574 - 582Publisher
Nippon Tekko KyokaiLocation
Tokyo, JapanLink to full text
ISSN
0915-1559eISSN
1347-5460Language
engPublication classification
C1 Refereed article in a scholarly journalCopyright notice
2010, ISIJUsage metrics
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No categories selectedKeywords
transformation-induced plasticityTRIP steelDP steelbake-hardeningtransmission electron microscopyatom probe tomographydislocation structureScience & TechnologyTechnologyMetallurgy & Metallurgical EngineeringTRANSMISSION ELECTRON-MICROSCOPYRETAINED AUSTENITE0.4C-1.5SI-0.8MN STEELBAINITETRIPTEMPERATUREPRECIPITATIONMETALLURGY
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