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In view of the strong affinity of chromium for nitrogen (binding energy at 20° C. approximately 1 eV.)8, the precipitated chromium nitrides would be expected to be stable, and would be unaffected by the 'dissolving' effect of adjacent unsaturated dislocations (the binding energy of which for nitrogen would be expected to be similar to that in iron, about 0•45 eV.) 9 • Precipitation at an intermediate temperature (such as 400° C.) would therefore be expected permanently to r emove nitrogen from solution and reduce the amount remaining to cause brittleneBB at lower temperatures.

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