1.2067 | 102Cr6 +QO +T Hardened and tempered (quenchant: oil)
| Numeric designation | 1.2067 | SAE52100 | AMS6440 |
|---|---|
| Chemical designation | 102Cr6 |
| State | +QO +T Hardened and tempered (quenchant: oil) |
| Etching | 3% Nital |
This hypereutectoid steel (bar stock with ⌀ = 16 mm) was first annealed on cementite network (initial condition: see case study LINK) and subsequently austenitized at 849 °C for 30 min, quenched in oil and then tempered at 180 °C for 2 hours. Unetched, some dark gray manganese sulfides show up in the longitudinal direction as well as a hardening crack. As the specimen had a slight rim decarburization in its initial state, the lower carbon massive martensite has formed at the rim. In addition, some segregation lines are recognizable. In contrast, carbon-rich squamous martensite with low residual tautite contents is present in the core.
The hardness increases from 689 HV0.5 at the edge of the specimen to 753 HV0.5 in the core.
Condition:
- 950 °C / 60 min / furnace
- 840 °C / 30 min / oil – 180 °C / 2 h / air
