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Microstructures and mechanical properties of DP and TRIP steels after laboratory simulated strip casting

Conference Paper


Abstract


  • The laboratory simulation of strip casting of dual phase (DP) and transformation-induced

    plasticity (TRIP) steels was carried out using heat treatments of dip-cast samples in a dilatometer. The

    microstructure of DP steel (0.08C-0.81Si-1.47Mn-0.03Al wt. %) consisted of ~80 % ferrite and

    remaining martensite with little of bainite, whereas the microstructure of TRIP steel

    (0.17C-1.52Si-1.61 Mn-0.03Al wt. %) consisted of ~65 % ferrite, 4% retained austenite and remaining

    bainite and martensite. Small amount of Widmiinstatten ferrite was also observed in both steels. The

    uniaxial tensile tests were carried out on sub-sized specimens. DP steel had the ultimate tensile

    strength (UTS) of 446 MPa at uniform elongation (e11 ) of 0.17 while TRIP steel had the UTS of 495

    MPa at e11 of 0.20, which are lower than those in hot rolled steels. This can be a consequence of cast

    microstructure (absence of deformation), large grain size, and presence of some Widmanstiitten ferrite.

    In both steels the predominant fracture mode was ductile, with presence of some isolated cleavage

    facets associated with the second phase. TRIP steel had a more sustainable increase in strain hardening

    exponent than DP steel. Crussard-Jaoul model analysis has shown very weak TRIP effect, probably

    because of low amount of retained austenite ( 4% ).

UOW Authors


  •   Xiong, Zhiping (external author)
  •   Kostryzhev, Andrew (external author)
  •   Stanford, Nicole (external author)
  •   Pereloma, Elena

Publication Date


  • 2014

Citation


  • Xiong, Z. P., Kostryzhev, A. G., Stanford, N. E. & Pereloma, E. V. (2014). Microstructures and mechanical properties of DP and TRIP steels after laboratory simulated strip casting. In K. Tsuzaki, T. Ohmura & N. Tsuji (Eds.), International Symposium on Steel Science: (ISSS-2014) (pp. 119-122). Japan: Iron and Steel Institute of Japan.

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/4233

Start Page


  • 119

End Page


  • 122

Abstract


  • The laboratory simulation of strip casting of dual phase (DP) and transformation-induced

    plasticity (TRIP) steels was carried out using heat treatments of dip-cast samples in a dilatometer. The

    microstructure of DP steel (0.08C-0.81Si-1.47Mn-0.03Al wt. %) consisted of ~80 % ferrite and

    remaining martensite with little of bainite, whereas the microstructure of TRIP steel

    (0.17C-1.52Si-1.61 Mn-0.03Al wt. %) consisted of ~65 % ferrite, 4% retained austenite and remaining

    bainite and martensite. Small amount of Widmiinstatten ferrite was also observed in both steels. The

    uniaxial tensile tests were carried out on sub-sized specimens. DP steel had the ultimate tensile

    strength (UTS) of 446 MPa at uniform elongation (e11 ) of 0.17 while TRIP steel had the UTS of 495

    MPa at e11 of 0.20, which are lower than those in hot rolled steels. This can be a consequence of cast

    microstructure (absence of deformation), large grain size, and presence of some Widmanstiitten ferrite.

    In both steels the predominant fracture mode was ductile, with presence of some isolated cleavage

    facets associated with the second phase. TRIP steel had a more sustainable increase in strain hardening

    exponent than DP steel. Crussard-Jaoul model analysis has shown very weak TRIP effect, probably

    because of low amount of retained austenite ( 4% ).

UOW Authors


  •   Xiong, Zhiping (external author)
  •   Kostryzhev, Andrew (external author)
  •   Stanford, Nicole (external author)
  •   Pereloma, Elena

Publication Date


  • 2014

Citation


  • Xiong, Z. P., Kostryzhev, A. G., Stanford, N. E. & Pereloma, E. V. (2014). Microstructures and mechanical properties of DP and TRIP steels after laboratory simulated strip casting. In K. Tsuzaki, T. Ohmura & N. Tsuji (Eds.), International Symposium on Steel Science: (ISSS-2014) (pp. 119-122). Japan: Iron and Steel Institute of Japan.

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/4233

Start Page


  • 119

End Page


  • 122