Micrographs of the lengthening of a bainitic sheaf nucleated within the grain in the 210N steel at different isothermal times: (a) 50 s, (b) 60 s, and (c) 75 s; (d) length–time plot.

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Micrographs of the lengthening of a bainitic sheaf nucleated within the grain in the 210N steel at different isothermal times: (a) 50 s, (b) 60 s, and (c) 75 s; (d) length–time plot.

2020, vol.27,no.5,pp.620-629.

In situ observation of the effect of AlN particles on bainitic transformation in a carbide-free medium carbon steel .

Figures of the Article

Curves of volume fraction of AlN with different mass fractions of Al and N at 930°C.
Isothermal treatment results of the 20N and 210N steels at 320°C: (a) dilation–time curves; (b) XRD patterns; (c) df/dt‒time curves.
Microstructures of (a, d) 20N steel and (b, e) 210N steel after isothermal treatment at 320°C, and (c, f) morphologies of AlN particles in 210N steel.
Orientation images and misorientation angle distributions of (a, c) 20N steel and (b, d) 210N steel transformed at 320°C.
Nucleation of 20N and 210N steels with different isothermal times: (a) 20N steel, 10 s; (b) 20N steel, 150 s; (c) 210N steel, 10 s; (d) 210N steel, 150 s. Grain boundary; Phase boundary; Inner grain; AlN particle.
Curves of the number of nuclei with isothermal time in the (a) 20N and (b) 210N steels.
Micrographs of the lengthening of a bainitic sheaf nucleated within the grain in the 20N steel at different isothermal times: (a) 50 s, (b) 60 s, and (c) 80 s; (d) length–time plot.
Micrographs of the lengthening of a bainitic sheaf nucleated within the grain in the 210N steel at different isothermal times: (a) 50 s, (b) 60 s, and (c) 75 s; (d) length–time plot.
Micrographs of the lengthening of a bainitic sheaf nucleated at the grain boundaries in the 20N steel at different isothermal times: (a) 90 s, (b) 100 s, and (c) 110 s; (d) length–time plot.
Micrographs of the lengthening of a bainitic sheaf nucleated at the grain boundaries in the 210N steel at different isothermal times: (a) 90 s, (b) 110 s, and (c) 130 s; (d) length–time plot.
Schematic description of the nucleation and growth of BF on the 210N steel (positions a, b, and c: initial nucleus; positions a′, b′, and c′: subsequent nucleus).

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