Table 11
The effect of the process of coating (Nb–Ti–Al–V) N on the characteristics of the pre-nitrided high-speed steel of the broaches for herringbone type joint at nitriding temperature of 510 °C and holding time of 45 min and wear resistance in the cutting process.
| The ratio of gases when nitriding (nitrogen/argon) | The characteristics of the nitrided layer of high-speed steel | The characteristics of the nitrided layer of high-speed steel after coating | Wear of the tooth (μm) of broach at a cutting path of 3150 mm |
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|---|---|---|---|---|---|
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|
|
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| Total thickness (μm) | Microhardness (GPa) | Total thickness (μm) | Microhardness (GPa) | ||
| 20% N2/80% Ar | 300–320 | 12.9 | 420–440 | 12.7 | 100 |
| 40% N2/60% Ar | 250–270 | 13.5 | 340–370 | 13.3 | 140 |
| 60% N2/40% Ar | 180 | 14.0 | 260 | 14.0 | 220 |
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