Table 5
The effect of temperature and composition of the gas medium on the thickness and microhardness of the nitrided layer of high-speed steel of the broaches for herringbone type joint at holding time for nitriding with nitrogen ions of 45 min.
| Nitriding mode | The thickness of the nitrided layer | Maximum microhardness (GPa) | ||
|---|---|---|---|---|
|
|
|
|||
| Process temperature | The ratio of gases during nitriding (nitrogen/argon) | Productive thickness (μm) | Total thickness (μm) | |
| 450 °С | 20% N2/80% Ar | 40 | 140–150 | 11.2 |
| 40% N2/60% Ar | 25–30 | 100 | 11.8 | |
| 60% N2/40% Ar | 10–15 | 70–80 | 12.2 | |
| 480 °С | 20% N2/80% Ar | 55 | 175–190 | 12.0 |
| 40% N2/60% Ar | 30–40 | 140–150 | 12.6 | |
| 60% N2/40% Ar | 20 | 110–120 | 13.1 | |
| 510 °С | 20% N2/80% Ar | 85 | 300–320 | 12.9 |
| 40% N2/60% Ar | 60–70 | 250–270 | 13.5 | |
| 60% N2/40% Ar | 50 | 180 | 14.0 | |
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