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S7 angle shear blade - Grinding cracks - Machining defects


Figure 1: S7 angle shear blade - This S7 angle shear blade failed prematurely due to grinding abuse caused by an unstable microstructure at the surface.


Figure 2: S7 angle shear blade - Left figure: Surface, Right figure: Interior.

Defect name: Grinding cracks
Record No.: 1887
Type of defect (Internal/Surface): Internal, surface
Defect classification: Machining defects
Steel name: AISI S7 tool steel
Steel composition in weight %: No data.
Note:  Tool steel failure example. The surface was accidentally carburized and the austenitizing temperature was excessive producing a coarse grained interior and coarse plate martensite and retained austenite at the surface (nital).
Reference: Not shown in this demonstration version.