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Uncovering the mechanism of dislocation interaction with nanoscale (<4 nm) interphase precipitates in microalloyed ferritic steels

Journal Article


Abstract

  • Nanoscale interphase precipitation in microalloyed ferritic steels provides a remarkable (200–400 MPa) strengthening increment, however its origin is unclear. Scanning transmission electron microscopy revealed step formation at the matrix/precipitate interface after both macroscopic uniaxial tension and nanopillar compression testing. Supported by Density Functional Theory modelling, dislocation shearing of nano-sized (<4 nm) VC precipitates was identified as a strengthening mechanism. The findings suggest the operation of an unusual {001}<110> slip–system in the VC nanoparticles. IMPACT STATEMENT: Shearing of VC nanoparticles by dislocations on a non-traditional slip–system was identified as a strengthening mechanism for steels with <4 nm nanoparticles.

Publication Date

  • 2020

Citation

  • Pereloma, E., Cortie, D., Singh, N., Casillas, G., & Niessen, F. (2020). Uncovering the mechanism of dislocation interaction with nanoscale (<4 nm) interphase precipitates in microalloyed ferritic steels. Materials Research Letters, 8(9), 341-347. doi:10.1080/21663831.2020.1764121

Scopus Eid

  • 2-s2.0-85085167902

Web Of Science Accession Number

Start Page

  • 341

End Page

  • 347

Volume

  • 8

Issue

  • 9

Abstract

  • Nanoscale interphase precipitation in microalloyed ferritic steels provides a remarkable (200–400 MPa) strengthening increment, however its origin is unclear. Scanning transmission electron microscopy revealed step formation at the matrix/precipitate interface after both macroscopic uniaxial tension and nanopillar compression testing. Supported by Density Functional Theory modelling, dislocation shearing of nano-sized (<4 nm) VC precipitates was identified as a strengthening mechanism. The findings suggest the operation of an unusual {001}<110> slip–system in the VC nanoparticles. IMPACT STATEMENT: Shearing of VC nanoparticles by dislocations on a non-traditional slip–system was identified as a strengthening mechanism for steels with <4 nm nanoparticles.

Publication Date

  • 2020

Citation

  • Pereloma, E., Cortie, D., Singh, N., Casillas, G., & Niessen, F. (2020). Uncovering the mechanism of dislocation interaction with nanoscale (<4 nm) interphase precipitates in microalloyed ferritic steels. Materials Research Letters, 8(9), 341-347. doi:10.1080/21663831.2020.1764121

Scopus Eid

  • 2-s2.0-85085167902

Web Of Science Accession Number

Start Page

  • 341

End Page

  • 347

Volume

  • 8

Issue

  • 9