Table 7
X-ray structural analysis of the phase composition of the surface layer of high-speed steel of the broaches for herringbone type joint after nitriding with different gas ratios, at nitriding temperature of 480 °C and holding time of 45 min.
| Phase composition | Volume fraction of phase (%) in nitrided layer | |||
|---|---|---|---|---|
|
|
||||
| 20% N2 + 80% Ar | 40% N2 + 60% Ar | 60% N2 + 40% Ar | ||
| Radiation used: CuKa (shooting in sliding geometry) | ||||
| Fe2N | – | – | 24.6 | |
| Mo2N | 15.8 | 14.2 | 10.5 | |
| Fe3(W,Mo)3(C,N) | 36.0 | 29.3 | 21.4 | |
| Feα(C,N) | 48.2 | 56.5 | 43.5 | |
| Radiation used: CuKa | ||||
| Fe2N | – | – | 6.4 | |
| Mo2N | 1.7 | 2.9 | 3.9 | |
| Fe3(W,Mo)3(C,N) | 6.1 | 6.6 | 8.0 | |
| Feα(C,N) | 92.2 | 90.5 | 81.7 | |
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