Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Stabilization of retained austenite by the two-step intercritical heat treatment and its effect on the toughness of a low alloyed steel
Highlights Fine film-like stable retained austenite was obtained in a low alloyed steel. Stabilization of retained austenite was studied. Intercritical partition of C, Mn and Ni was revealed by TEM study. Effect of retained austenite on toughness was investigated. Fracture process of the steel was studied by instrument impact test.
Abstract Fine film-like stable retained austenite was obtained in a Fe–0.08C–0.5Si–2.4Mn–0.5Ni in weight percent (wt.%) steel by the two-step intercritical heat treatment. The first step of intercritical annealing creates a mixed microstructure of preliminary alloy-enriched martensite and lean alloyed intercritical ferrite, which is called as “reverted structure” and “un-reverted structure”, respectively. The second step of intercritical tempering is beneficial for producing film-like stable reverted austenite along the reverted structure. The stabilization of retained austenite was studied by using scanning electron microscopy (SEM), transmission electron microscopy (TEM), dilatometry and X-ray diffraction (XRD) analysis. The two-step austenite reverted transformation associated with intercritical partition of C, Mn and Ni is believed to be the underlying basis for stabilization of retained austenite during the two-step intercritical heat treatment. Stable retained austenite is not only beneficial for high ductility, but also for low temperature toughness by restricting brittle fracture. With 10% (volume fraction) of retained austenite in the steel, high low temperature toughness with average Charpy impact energy of 65J at −80°C was obtained.
Stabilization of retained austenite by the two-step intercritical heat treatment and its effect on the toughness of a low alloyed steel
Highlights Fine film-like stable retained austenite was obtained in a low alloyed steel. Stabilization of retained austenite was studied. Intercritical partition of C, Mn and Ni was revealed by TEM study. Effect of retained austenite on toughness was investigated. Fracture process of the steel was studied by instrument impact test.
Abstract Fine film-like stable retained austenite was obtained in a Fe–0.08C–0.5Si–2.4Mn–0.5Ni in weight percent (wt.%) steel by the two-step intercritical heat treatment. The first step of intercritical annealing creates a mixed microstructure of preliminary alloy-enriched martensite and lean alloyed intercritical ferrite, which is called as “reverted structure” and “un-reverted structure”, respectively. The second step of intercritical tempering is beneficial for producing film-like stable reverted austenite along the reverted structure. The stabilization of retained austenite was studied by using scanning electron microscopy (SEM), transmission electron microscopy (TEM), dilatometry and X-ray diffraction (XRD) analysis. The two-step austenite reverted transformation associated with intercritical partition of C, Mn and Ni is believed to be the underlying basis for stabilization of retained austenite during the two-step intercritical heat treatment. Stable retained austenite is not only beneficial for high ductility, but also for low temperature toughness by restricting brittle fracture. With 10% (volume fraction) of retained austenite in the steel, high low temperature toughness with average Charpy impact energy of 65J at −80°C was obtained.
Stabilization of retained austenite by the two-step intercritical heat treatment and its effect on the toughness of a low alloyed steel
Xie, Z.J. (Autor:in) / Yuan, S.F. (Autor:in) / Zhou, W.H. (Autor:in) / Yang, J.R. (Autor:in) / Guo, H. (Autor:in) / Shang, C.J. (Autor:in)
13.02.2014
6 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
| British Library Online Contents | 2014
Retained austenite in low carbon, manganese steel after intercritical heat treatment
| British Library Online Contents | 1994
| British Library Online Contents | 2016
| British Library Online Contents | 2018
| British Library Online Contents | 2018