Table 8
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 gear-shaping cutters at holding time when nitriding with nitrogen ions of 45 min.
| Nitriding mode | Nitrided layer thickness | Maximum microhardness (GPa) | ||
|---|---|---|---|---|
|
|
|
|||
| Process temperature | The ratio of gases when nitriding (nitrogen/argon) | Productive thickness (μm) | Total thickness (μm) | |
| 450 °С | 20% N2/80% Ar | 50 | 180 | 11.2 |
| 40% N2/60% Ar | 30–35 | 120–150 | 11.4 | |
| 60% N2/40% Ar | 15–20 | 80–90 | 11.8 | |
| 480 °С | 20% N2/80% Ar | 70 | 220–240 | 11.5 |
| 40% N2/60% Ar | 35–40 | 180–190 | 11.9 | |
| 60% N2/40% Ar | 25 | 140–160 | 12.2 | |
| 510 °С | 20% N2/80% Ar | 100 | 380 | 12.4 |
| 40% N2/60% Ar | 80 | 320–350 | 12.8 | |
| 60% N2/40% Ar | 60–70 | 220–240 | 13.1 | |
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