Abstract
AbstractPrecipitation in a high nitrogen austenitic stainless steel of the Nitronic series has been studied. Above a critical nitrogen concentration, cellular precipitation is observed together with formation of Cr2N as a general precipitate and intragranular precipitation of Z phase (Cr2Nb2N2). The nature of cellular precipitation has been studied using constant activity aging in nitrogen and the characteristics of the process have been examined using X-ray diffraction and electron microscopy. The cellular precipitation process is shown to be consistent with a model based on long range diffusion of nitrogen and equilibrium between the gas phase and steel matrix. The solubility of nitrogen in austenite in equilibrium with the gas phase or with Cr2N precipitates is consistent with published data.MST/917
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