Nitrogen absorption by Fe-1.04at.%Cr alloy: uptake of excess nitrogen

作者：Hosmani S S^*; Schacherl R E; Mittemeijer E J

来源：Journal of Materials Science, 2008, 43(8): 2618-2624.

DOI：10.1007/s10853-008-2473-9

By dedicated pre-nitriding (at 580 degrees C in an ammonia/hydrogen gas atmosphere) and de-nitriding (at 470 degrees C in a hydrogen gas atmosphere) experiments, performed on Fe-1.04at.%Cr alloy, it could be demonstrated that the uptake of "excess" nitrogen by the nitrided ferritic matrix is not due to the presence of iron in chromium-nitride precipitates, as it was suggested previously. The determination of nitrogen-absorption isotherms for these pre-nitrided and de-nitrided Fe-1.04at.%Cr alloy specimens revealed that the total amount of excess nitrogen in the alloy is composed of two parts: (a) nitrogen adsorbed at the precipitate/matrix interface, and (b) nitrogen dissolved interstitially in the ferrite matrix strained by the misfit between (coherent) the CrN precipitates and the matrix.

• 出版日期2008-4
• 单位中国科学院金属研究所