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| THE DEVELOPMENT OF CHROMIUM-DEPLETED ZONE IN 18-8 STAINLESS STEEL WITH TIME OF SENSITIZATION |
| HUA PAO-TING; SHEN HSING-SU; CHOU TEH-JUI; LI KUI-CHIH (Institute of Applied Chemistry; Academia Sinica) |
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Cite this article:
HUA PAO-TING; SHEN HSING-SU; CHOU TEH-JUI; LI KUI-CHIH (Institute of Applied Chemistry; Academia Sinica). THE DEVELOPMENT OF CHROMIUM-DEPLETED ZONE IN 18-8 STAINLESS STEEL WITH TIME OF SENSITIZATION. Acta Metall Sin, 1965, 8(4): 499-506.
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Abstract The development of the chromium-depleted zone with time of sensitization has been studied by the potentiostatic-coulometric method reported previously. The distribution curves of chromium in the depleted zone at different time of sensitization have been obtained. From these curves, the diffusion coefficient of Cr in the depleted zone at 650℃ is estimated to be 5×10~(-16)cm~2/sec. It is shown that the amount of chromium carbide precipitated at the grain boundaries increases nearly logarithmically with time of sensitization, and the precipitation of 1—2% of carbon contained in the steel at the grain boundaries is sufficient to cause severe intergranular corrosion.
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Received: 18 April 1965
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