EFFECT OF LITHIUM ON GRAIN BOUNDARY PRECIPITATION IN A CR-MN AUSTENITIC STEEL
Solution annealed samples of the nitrogen alloyed Cr-Mn austenitic steel Nitronic 32 were tested in pure Li at 873 K for 1000 h. It was observed that in this material Li grain boundary penetration occurred. Electron microscopic techniques, X-ray, and Auger electron analyses were used to study the precipitation processes at the grain boundaries both penetrated and not yet penetrated by Li. It was found that in the absence of Li, carbides of complex composition are precipitated. In the presence of Li these carbides rearrange themselves and change their composition while larger particles of a Li-Cr-N compound are formed. The austenitic matrix adjacent to these particles becomes susceptible to phase transformations as a consequence of compositional changes.
Bibliographic Reference: JOURNAL OF NUCLEAR MATERIALS, VOL. 116 (1983), NO. 1, PP. 112-122
Record Number: 1989122003600 / Last updated on: 1987-01-01
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