EN-GJS-500-14 | 5.3109 | Graphite classification and fracture appearance in tensile test
Numeric designation | 5.3109 |
---|---|
Chemical designation | EN-GJS-500-14 |
State | Graphite classification and fracture appearance in tensile test |
Etching | 3% Nital |
The microstructure of this ductile iron consists of ferrite. The graphite formation is slightly degenerate. The minimum tensile strength is 500 MPa, the minimum elongation at fracture is 14%.
An increasing pearlite content in the microstructure is therefore not a reliable indication of a higher strength grade. In this example, the increase in strength is achieved by solid solution hardening with Si.
Graphite classification according to EN ISO 945-1:2019
- Graphite form VI
- Guide number for the size range: 7
The SEM images show a force fracture by tensile testing. A quasi-cleavage fracture is present, as honeycomb fracture and cleavage fracture alternate.