Calcium-aluminate inclusion in fracture surface of 51CrV4 steel


Figure 1:Spherical inclusion in fracture surface of 51CrV4 steel.


Figure 2: Spherical inclusion in fracture surface of 51CrV4 steel, stereo-optical microscope, Mag. 10 X, scale bar: 1000 µm.


Figure 3: Spherical inclusion in fracture surface of 51CrV4 steel, stereo-optical microscope, Mag. 40 X, scale bar: 300 µm.


Figure 4: Spherical inclusion in fracture surface of 51CrV4 steel, SEM, Mag. 190 X, scale bar: 100 µm.


Figure 4: EDS spectrum of calcium-aluminate inclusion.

Inclusion name: Calcium-aluminate inclusion
Record No.: 285
Inclusion formula: CaO x Al2O3 x FeO
Inclusion type (Macro/Micro/Nano): Macro
Inclusion type (Exogenous/Indigenous): Indigenous
Inclusion classification: Oxide
Inclusion composition in weight %: EDS microanalysis: 30.31% O, 36.41% Al, 0.60% Si, 0.98% S, 22.58% Ca, 9.13% Fe
Sample: 51CrV4 (1.2241), spring steel
Steel composition in weight %: 0.47-0.55% C, 0.15-0.35% Si, 0.80-1.10% Mn, 0.030% P, 0.030% S, 0.90-1.20% Cr, 0.10-0.20% V.
Note: Inclusion in broken leaf spring.
Reference: Not shown in this demo version.

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