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Microstructural evolution of high Cr ferrite/martensite steel after deformation in metastable austenite zone

Journal Article


Abstract


  • In this paper, the influence of compressive deformation in metastable austenite zone (at 700, 600 and 500 °C, respectively) on microstructural characteristics and martensitic transformation behavior for the high Cr ferrite/martensite steel is investigated by using high-resolution dilatometry and transmission electron microscopy (TEM) observation. The results show that compressive deformation in metastable austenite zone results in decrease of martensite lath width and increase of martensite starting temperature (Ms) due to increase of defection density for martensitic nucleation. The martensitic transformation time is extended by the pre-stress loading above Ms, which is ascribed to decrease of interfacial migration rate during martensitic transformation by means of strain hardening. The results of tempering experiments indicate that decrease of deformation temperature leads to increase of recovery fraction. This is ascribed to that decrease of deformation temperature raises the residual strain energy and thus lowers the apparent activation energy for recovery. Hence, phenomenon of recovery occurs prematurely in the tempering specimen with the low deformation temperature.

Publication Date


  • 2017

Citation


  • Liu, C., Zhao, Q., Liu, Y., Wei, C., & Li, H. (2017). Microstructural evolution of high Cr ferrite/martensite steel after deformation in metastable austenite zone. Fusion Engineering and Design, 125, 367-371. doi:10.1016/j.fusengdes.2017.03.094

Scopus Eid


  • 2-s2.0-85016191402

Web Of Science Accession Number


Start Page


  • 367

End Page


  • 371

Volume


  • 125

Abstract


  • In this paper, the influence of compressive deformation in metastable austenite zone (at 700, 600 and 500 °C, respectively) on microstructural characteristics and martensitic transformation behavior for the high Cr ferrite/martensite steel is investigated by using high-resolution dilatometry and transmission electron microscopy (TEM) observation. The results show that compressive deformation in metastable austenite zone results in decrease of martensite lath width and increase of martensite starting temperature (Ms) due to increase of defection density for martensitic nucleation. The martensitic transformation time is extended by the pre-stress loading above Ms, which is ascribed to decrease of interfacial migration rate during martensitic transformation by means of strain hardening. The results of tempering experiments indicate that decrease of deformation temperature leads to increase of recovery fraction. This is ascribed to that decrease of deformation temperature raises the residual strain energy and thus lowers the apparent activation energy for recovery. Hence, phenomenon of recovery occurs prematurely in the tempering specimen with the low deformation temperature.

Publication Date


  • 2017

Citation


  • Liu, C., Zhao, Q., Liu, Y., Wei, C., & Li, H. (2017). Microstructural evolution of high Cr ferrite/martensite steel after deformation in metastable austenite zone. Fusion Engineering and Design, 125, 367-371. doi:10.1016/j.fusengdes.2017.03.094

Scopus Eid


  • 2-s2.0-85016191402

Web Of Science Accession Number


Start Page


  • 367

End Page


  • 371

Volume


  • 125