Journal
MATERIALS & DESIGN
Volume 132, Issue -, Pages 244-249Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2017.07.006
Keywords
Nb microalloyed steel; Strain-induced precipitation; TiN-NbC composite precipitate; Thermomechanical controlled processing; Precipitation strengthening; Toughness
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Funding
- CBMM, Brazil
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Absence of strain-induced precipitation of NbC is observed in a conventional hot rolled Nb-Ti microalloyed X90 strip. Quantitative analysis using transmission electron microscopy and 3D atom probe tomography indicates that epitaxial growth of NbC on pre-existing TiN particleswith a short inter-particle spacing of 300+/-65 nm suppresses the occurrence of strain-induced precipitation of NbC on dislocations. The model for predicting kinetics of strain-induced precipitation of NbC on dislocations is incorporated into a criterion for the end of nucleation of strain-induced precipitation to estimate the effects of process parameters on suppression of strain-induced precipitation of NbC. TiN particle inter-spacing is identified as a key parameter influencing the precipitation behavior of NbC during thermomechanical controlled processing. TiN-NbC composite precipitates offer an alternative approach to strain-induced precipitation of NbC for high temperature processing of Nb microalloyed steels with high toughness. The significance and possible implication of the TiN-NbC composite precipitate engineering are discussed. (C) 2017 Elsevier Ltd. All rights reserved.
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