1.1248 | C75S +I isotherm hardened
| Numeric designation | 1.1248 |
|---|---|
| Chemical designation | C75S |
| State | I (isothermally hardened) |
| Etching | 5 % Nital |
The sample was interstage quenched and tempered (bainitised). The microstructure consists of bainite. Carbides are still present. The holding time at austenitisation temperature could be slightly extended.
The hardness is 497 HV0.5.
Fe-Base
1.1221 | C60E +I Prior austenite grain boundaries
1.1274 | C100S +QW +T Prior austenite grain boundaries
1.1269 | C85S +QW +T Prior austenite grain boundaries
1.7076 | 32CrB4 +Q Prior austenite grain boundaries
1.1221 | C60E +QW +T Prior austenite grain boundaries
1.1191 | C45E +QW +T Prior austenite grain boundaries
1.7220 | 34CrMo4 +Q Prior austenite grain boundaries
1.7220 | 34CrMo4 +QT (12.9) Prior austenite grain boundaries
1.7076 | 32CrB4 +QT (12.9) Prior austenite grain boundaries
1.5511 | 35B2 +QT (9.8) Prior austenite grain boundaries