Table 9
The influence of the holding time during nitriding on the layer thickness and maximum microhardness of surface layer of high-speed steel of the gear-shaping cutters at a process temperature of 480 °C and gas ratio was 40% N2/60% Ar.
| Holding time at nitriding (min) | Productive thickness (μm) | Total thickness (μm) | Maximum microhardness (GPa) |
|---|---|---|---|
| 30 | 32 | 120 | 11.6 |
| 45 | 35–40 | 180–190 | 11.9 |
| 60 | 55 | 320 | 12.2 |
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