Calcium sulfide and aluminium oxide inclusions in 51CrV4 spring steel


Figure 1: SEM image of a complex, non-metallic inclusion taken by secondary electrons, scale bar: 8 µm.


Table 1: Semi-quantitative analysis of the inclusion in the studied spring steel in wt%.

Inclusion name: Calcium sulfide and aluminium oxide
Record No.: 570
Inclusion formula: CaS, Al2O3
Inclusion type (Macro/Micro/Nano): Micro
Inclusion type (Exogenous/Indigenous): Indigenous
Inclusion classification: Sulfide, oxide
Inclusion composition in weight %: See the table
Sample: 51CrV4 spring steel
Steel composition in weight %: 0.52% C, 0.35% Si, 0.96% Mn, 0.93% Cr, 0.12% V, 0.007% S, 0.010% Al.
Note: Fig. 1 shows a typical complex inclusion. Three analyses were performed on this inclusion to reveal the detailed composition, mainly of calcium sulfide and aluminum oxide.
Additional links: No. 571, No. 572, No. 573
Reference: Not shown in this demo version.

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