In situ characterisation of austenite/ferrite transformation kinetics and modelling of interphase precipitation inter-sheet spacing in V microalloyed HSLA steels

Samuel Clark, Yongjun Lan, Vit Janik, Arjan Rijkenberg, Seetharaman Sridhar

Research output: Chapter in Book/Report/Conference proceedingConference proceeding

1 Citation (Scopus)

Abstract

A new generation of low-carbon microalloyed High Strength Low Alloy (HSLA) steels has been developed to utilize a combination of single-phase ferritic microstructures and optimized interphase precipitation to provide high level strength and exceptional formability. The interphase precipitation reaction is a transient process lending itself strongly to take advantage of in-situ characterization techniques. The austenite/ferrite interface kinetics during isothermal transformation at 1003 K is measured using HT-CSLM, the pre-exponential effective mobility constant was found to be mobility 0.822 (m J)/(mole s). The V interphase precipitation is characterised using TEM at isothermal transformation temperatures of 923 and 973 K as having inter-sheet spacing of 22±7 and 32±9 nm respectively. Interphase precipitation inter-sheet-spacing is simulated using a revised Quasi-Ledge model and qualitatively predicts the observed trends observed for inter-sheet spacing. The results of in-situ characterisation and modelling suggest that it is possible to optimize the strengthening potential of the precipitation processes by controlling the thermal processing of microalloyed HSLA.

Original languageEnglish
Title of host publicationTHERMEC 2016
PublisherTrans Tech Publications
Pages356-362
Number of pages7
Volume879
ISBN (Print)9783035711295
DOIs
Publication statusPublished - 2017
Externally publishedYes
Event9th International Conference on Processing and Manufacturing of Advanced Materials - Graz, Austria
Duration: 29 May 20163 Jun 2016

Publication series

NameMaterials Science Forum
Volume879
ISSN (Print)02555476

Conference

Conference9th International Conference on Processing and Manufacturing of Advanced Materials
Abbreviated titleTHERMEC 2016
CountryAustria
CityGraz
Period29/05/163/06/16

Fingerprint

high strength steels
austenite
High strength steel
Austenite
Ferrite
ferrites
spacing
Kinetics
kinetics
Formability
Carbon
Transmission electron microscopy
Microstructure
ledges
high strength
Temperature
trends
transmission electron microscopy
microstructure
carbon

Keywords

  • HSLA
  • In Situ-HT-CLSM
  • Interphase precipitation
  • Quasi-ledge model

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Clark, S., Lan, Y., Janik, V., Rijkenberg, A., & Sridhar, S. (2017). In situ characterisation of austenite/ferrite transformation kinetics and modelling of interphase precipitation inter-sheet spacing in V microalloyed HSLA steels. In THERMEC 2016 (Vol. 879, pp. 356-362). (Materials Science Forum; Vol. 879). Trans Tech Publications. https://doi.org/10.4028/www.scientific.net/MSF.879.356

In situ characterisation of austenite/ferrite transformation kinetics and modelling of interphase precipitation inter-sheet spacing in V microalloyed HSLA steels. / Clark, Samuel; Lan, Yongjun; Janik, Vit; Rijkenberg, Arjan; Sridhar, Seetharaman.

THERMEC 2016. Vol. 879 Trans Tech Publications, 2017. p. 356-362 (Materials Science Forum; Vol. 879).

Research output: Chapter in Book/Report/Conference proceedingConference proceeding

Clark, S, Lan, Y, Janik, V, Rijkenberg, A & Sridhar, S 2017, In situ characterisation of austenite/ferrite transformation kinetics and modelling of interphase precipitation inter-sheet spacing in V microalloyed HSLA steels. in THERMEC 2016. vol. 879, Materials Science Forum, vol. 879, Trans Tech Publications, pp. 356-362, 9th International Conference on Processing and Manufacturing of Advanced Materials , Graz, Austria, 29/05/16. https://doi.org/10.4028/www.scientific.net/MSF.879.356
Clark, Samuel ; Lan, Yongjun ; Janik, Vit ; Rijkenberg, Arjan ; Sridhar, Seetharaman. / In situ characterisation of austenite/ferrite transformation kinetics and modelling of interphase precipitation inter-sheet spacing in V microalloyed HSLA steels. THERMEC 2016. Vol. 879 Trans Tech Publications, 2017. pp. 356-362 (Materials Science Forum).
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AB - A new generation of low-carbon microalloyed High Strength Low Alloy (HSLA) steels has been developed to utilize a combination of single-phase ferritic microstructures and optimized interphase precipitation to provide high level strength and exceptional formability. The interphase precipitation reaction is a transient process lending itself strongly to take advantage of in-situ characterization techniques. The austenite/ferrite interface kinetics during isothermal transformation at 1003 K is measured using HT-CSLM, the pre-exponential effective mobility constant was found to be mobility 0.822 (m J)/(mole s). The V interphase precipitation is characterised using TEM at isothermal transformation temperatures of 923 and 973 K as having inter-sheet spacing of 22±7 and 32±9 nm respectively. Interphase precipitation inter-sheet-spacing is simulated using a revised Quasi-Ledge model and qualitatively predicts the observed trends observed for inter-sheet spacing. The results of in-situ characterisation and modelling suggest that it is possible to optimize the strengthening potential of the precipitation processes by controlling the thermal processing of microalloyed HSLA.

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