M4C3 carbides in 0.10C-2.00Mn-0.40Mo-0.30V steel


Figure 1: TEM observation of a thin-foil from Steel E tempered at 600 C for 10 h. Zone axis is [100] of ferrite matrix. (a) Bright field image. (b) Dark field image using the carbide diffraction spot indicated by the arrow in (c). The 002 and 011 reflections are from the ferrite. Scale bar: 100 nm.


Figure 2: TEM observation of a thin-foil from Steel E tempered at 600 C for 20 h. Zone axis is [001] of ferrite matrix. (a) Bright field image. (b) Dark field image using the carbide diffraction spot indicated by the arrow in (c). The 002 and 011 reflections are from the ferrite. Scale bar: 100 nm.


Figure 3: TEM observation of a thin-foil from Steel E tempered at 600 C for 30 h. Zone axis is [001] of ferrite matrix. (a) Bright field image. (b) Dark field image using the carbide diffraction spot indicated by the arrow in (c). The 002 and 011 reflections are from the ferrite. Scale bar: 100 nm.


Figure 4: Observations of steel E tempered at 600 C. (a) Relationship between the M4C3 volume fraction and the tempering time. (b) Relationship between the M4C3 length and the tempering time. (c) Relationship between the number density of M4C3 particles and the tempering time. (d) Number density distribution of the length of M4C3 particles in the steel tempered for 10 h. (e) Number density distribution of the length of M4C3 particles tempered for 30 h.

Carbide name: M4C3
Record No.: 661
Carbide formula: M4C3
Carbide type: M4C3
Carbide composition in weight %: No data
Image type: TEM
Steel name: 0.10C-2.00Mn-0.40Mo-0.30V
Mat.No. (Wr.Nr.) designation: No data
DIN designation: No data
AISI/SAE/ASTM designation: No data
Other designation: No data
Steel group: Martensitic steels
Steel composition in weight %: Steel E: 0.10% C, <0.005% Si. 2.00% Mn, 0.40% Mo, 0.30% V, 0.03% Al, 0.0041% N.
Heat treatment/condition: No data
Note: Figures 1 - 3 show thin-foil TEM images of Steel E tempered for a variety of times. These pictures were taken from the [100] orientation of the matrix. In Fig. 2 - 3, the needle-like precipitates are the cross-sectioned images of precipitates growing on the {001}. plane, which is parallel to the observation direction. The carbide morphology was characterised from over 500 particles in each sample. Figure 4 shows the volume fraction of carbide, carbide length and number density plotted against the tempering time. The number density distribution of the length of M4C3 particles is also shown. The solid circles represent the average of data from different locations, and the scatter of the data is indicated by error bars.
Links: No data
Reference: Not shown in this demo version.

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