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To assess long-term structural integrity under operational conditions innuclear reactors, SS 316LN with varying nitrogen content is subjected tothermal aging for 20000 hours at 650{\deg}C. While the annealing twins andheterogeneous grain evolution by bimodal division are independent of chemicalcomposition, the type, size and morphology of evolving secondary phases arecharacteristic for nitrogen concentration. Colour contrast in bright fieldoptical microscopy combined with transmission electron microscopy reveals thepresence of three major precipitate phases; M23(C, N)6, Fe2Mo intermetallicsand Cr2N. Contiguously formed hetero-structures of Fe2Mo and Cr2N arequantified and extensive formation has been observed in steels with highnitrogen content (0.14 wt. % and 0.22 wt. %). A unique occurrence ofmorphological derivatives of intra-granular M23(C, N)6 precipitates withcube-on-cube orientation relationship such as (1) isolated cubes, (2) primarystringers/strings of cubes, (3) secondary stringers/clusters of branchedprimary strings, and (4) clusters of laths are identified. The stringers andlaths are preferentially grown in{111}/<110>{\gamma} and have crystallographicvariants. The conclusions are drawn from bright field colour contrast opticalmicrographs in the present study demonstrate the potential of light opticalmicroscopy to be used as a significant tool to efficiently and accuratelyprocess huge amount of data including the preferential growth planes/directions({111}/<110>) of morphological derivatives of M23(C, N)6 precipitates, byanalyzing the symmetry and dense planes/directions of secondary phases. Overallmechanical properties have been reformed by the precipitation strengtheningeffect arising from the excess nitrogen content.

Contiguous Hetero-structures & Co-existing Morphological Derivatives of  Preferentially Grown Carbo-nitrides in Long Term Aged SS 316LN with Varying  Nitrogen Concentration