High Interstitial Stainless Austenitic Steels by Hans Berns Valentin Gavriljuk & Sascha Riedner

Author:Hans Berns, Valentin Gavriljuk & Sascha Riedner
Language: eng
Format: epub
Publisher: Springer Berlin Heidelberg, Berlin, Heidelberg

As expected (see, e.g., [122]), α-martensite is formed at the intersection of ε-plates and here the cementite precipitates of 20–50 nm in size are larger than in the ε-martensite plates. Precipitates of ζ–Fe2N nitride, 2–3 nm in size, are dispersed in the austenite.

After fracture at 3800 cycles (state 3), some areas depleted of dislocations appear in the structure along with those of a high density in the range of 1011 cm−2. Again ζ–Fe2N nitrides are observed in the austenite (Fig. 3.49).

Fig. 3.49Structure of steel CN96 fractured after 3800 tension/compression cycles at σa = ±450 MPa (specimen 3 in Fig. 3.45). a TEM image showing an uneven distribution of dislocations and precipitates of ζ-nitride Fe2N. b Diffraction pattern; zone axes [112]γ and [−11.5 × −4]ζ

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