Low temperature nitriding behavior in annealed 2205 duplex stainless steel

Figures & data

Table 1. Chemical composition of 2205 steel.

Steel	C	Si	Mn	Cr	Ni	Mo	Cu	Co	N	Fe
2205	0.024	0.45	0.37	22.11	5.72	2.98	0.21	0.051	0.16	bal.

Figure 1. Light-optical micrographs of DSS 2205 annealed and subsequently nitrided in pure NH₃ for 25 h at 380°C, 400°C and 430°C, respectively.

Figure 2. X-ray diffractograms for the surface-adjacent zone of the specimens pre-annealed at (a) 1000°C and (b) 1200°C, and subsequently nitrided at different temperatures in pure NH₃.

Figure 3. Light-optical micrographs of DSS 2205 annealed and subsequently nitrided in NH₃–H₂ mixtures for 25 h at 380°C, 400°C and 430°C, respectively.

Figure 4. X-ray diffractograms for the surface-adjacent zone of the specimens pre-annealed at (a) 1000°C and (b) 1200°C, and subsequently nitrided at different temperatures in NH₃–H₂ atmosphere.

Figure 5. Hardness-depth profiles of nitrided cases obtained along ferrite and austenite bands respectively, after annealing at 1000°C and nitriding in (a) pure NH₃ and in (b) NH₃–H₂ atmosphere, and after annealing at 1200°C and nitriding in (c) pure NH₃ and in (d) NH₃–H₂ atmosphere.

Data availability statement

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