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Austenite

The Experts below are selected from a list of 300 Experts worldwide ranked by ideXlab platform

Tadashi Furuhara – 1st expert on this subject based on the ideXlab platform

  • Microstructure of reverted Austenite in Fe-0.3N martensite
    Scripta Materialia, 2018
    Co-Authors: Mitsutaka Sato, Goro Miyamoto, Sou Matsumoto, Tadashi Furuhara

    Abstract:

    Abstract Reverse transformation behavior during intercritical annealing was studied in Fe-0.3 mass%N binary alloy. Two morphologies of acicular and globular Austenite are formed during reversion. The globular Austenite has almost same orientation with one side of adjacent prior Austenite grain and grows into the martensite with larger deviation angle from Kurdjumov-Sachs orientation relationship (K-S OR). On the other hand, the acicular Austenite holds a near K-S OR with its surrounding martensite matrix. A large amount of retained Austenite was obtained by a simple intercritical annealing due to enrichment of nitrogen into reverted Austenite.

  • analysis of recrystallization behavior of hot deformed Austenite reconstructed from ebsd orientation maps of lath martensite
    Materials Science Forum, 2016
    Co-Authors: Manabu Kubota, Goro Miyamoto, Kohsaku Ushioda, Tadashi Furuhara

    Abstract:

    The recrystallization behavior of hot-deformed Austenite of 0.55% C low alloy steels at 900, 850 and 800°C was investigated by a conventional double-hit compression test and a new method which reconstructs the parent Austenite orientation map from an EBSD (electron backscattering diffraction) orientation map of daughter lath martensite. The new method can clearly reconstruct the parent Austenite structure at high temperature from the daughter lath martensite structure and we can obtain the information on crystal orientation of the work-hardened Austenite. It was revealed that recrystallization of Austenite at 800 °C is significantly retarded by the addition of 0.1% V. The strong texture of parallel to the compression direction develops just after the hot-deformation, but this texture becomes weaker as the recrystallization progresses. By applying the reconstruction method, it becomes possible to evaluate various phenomena related to the hot-deformation of Austenite

  • analysis of recrystallization behavior of hot deformed Austenite reconstructed from electron backscattering diffraction orientation maps of lath martensite
    Scripta Materialia, 2016
    Co-Authors: Manabu Kubota, Goro Miyamoto, Kohsaku Ushioda, Tadashi Furuhara

    Abstract:

    Abstract The recrystallization behavior of hot-deformed Austenite of a 0.55% C steel at 800 °C was investigated by a method of reconstructing the parent Austenite orientation map from an electron backscattering diffraction orientation map of lath martensite. Recrystallized Austenite grains were clearly distinguished from un-recrystallized Austenite grains. Very good correlation was confirmed between the static recrystallization behavior investigated mechanically by double-hit compression tests and the change in Austenite microstructure evaluated by the reconstruction method. The recrystallization behavior of hot-deformed 0.55% C steel at 800 °C is directly revealed and it was observed that by addition of 0.1% V the recrystallization was significantly retarded.

A Charai – 2nd expert on this subject based on the ideXlab platform

  • effect of the bainitic transformation temperature on retained Austenite fraction and stability in ti microalloyed trip steels
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2009
    Co-Authors: A Kammouni, A Charai, W Saikaly, Myriam Dumont, C Marteau, X Bano

    Abstract:

    TRIP properties in four hot-rolled microalloyed steels were studied as a function of bainitic domain entrance temperature. It was found that this temperature affects the size and morphology of the retained Austenite grains. Size and morphology was shown to play a role on the stability of the retained Austenite. This stability was shown to be the major factor affecting the mechanical properties of these steels. In the case of the lowest bainitic temperature, the TRIP effect is hindered due to the premature transformation of Austenite into martensite probably due to an insufficient carbon enrichment of the small Austenite grains. Moreover the bainitic treatment performed at the highest temperature contained a very low volume fraction of retained Austenite that does not transform even under deformation. Using TEM and the Kikuchi-line method, it was shown that the sample that did not undergo a phase transformation during FIB milling had a carbon concentration in its retained Austenite grains of approximately 1.7%.

A Kammouni – 3rd expert on this subject based on the ideXlab platform

  • effect of the bainitic transformation temperature on retained Austenite fraction and stability in ti microalloyed trip steels
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2009
    Co-Authors: A Kammouni, A Charai, W Saikaly, Myriam Dumont, C Marteau, X Bano

    Abstract:

    TRIP properties in four hot-rolled microalloyed steels were studied as a function of bainitic domain entrance temperature. It was found that this temperature affects the size and morphology of the retained Austenite grains. Size and morphology was shown to play a role on the stability of the retained Austenite. This stability was shown to be the major factor affecting the mechanical properties of these steels. In the case of the lowest bainitic temperature, the TRIP effect is hindered due to the premature transformation of Austenite into martensite probably due to an insufficient carbon enrichment of the small Austenite grains. Moreover the bainitic treatment performed at the highest temperature contained a very low volume fraction of retained Austenite that does not transform even under deformation. Using TEM and the Kikuchi-line method, it was shown that the sample that did not undergo a phase transformation during FIB milling had a carbon concentration in its retained Austenite grains of approximately 1.7%.