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STRESS CORROSION CRACKING OF 304L STAINLESS STEEL IN WATER AT 288℃ |
LU Yonghao; CHU Wuyang; GAO Kewei; QIAO Lijie |
Department of Materials Physics; University of Science and Technology Beijing; Beijing 100083 |
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Cite this article:
LU Yonghao; CHU Wuyang; GAO Kewei; QIAO Lijie. STRESS CORROSION CRACKING OF 304L STAINLESS STEEL IN WATER AT 288℃. Acta Metall Sin, 2004, 40(7): 763-767 .
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Abstract Stress corrosion cracking (SCC) of a sensitized 304L stainless steel was carried out under slow tension of a pre--cracked sample in water containing oxygen at 288℃. Thin foil samples were prepared along its cross--section containing the pre--cracks,
and the tip region of SCC was studied by analytical TEM. The observations show
that there are oxides with a size of several hundreds nanometers ahead of a crack tip of SCC and around the discontinuous microcracks. Fine--probe analysis was used to determine local compositions of the oxides, indicating the oxides are Cr2O3, Fe3O4 and their mixture.
Many microcracks are distributed unevenly
in the oxides. Microcracks initiated discontinuously in the oxides ahead of a main crack because of a large stress concentration. The growth and connection of the discontinuous microcracks in the oxides resulted in the propagation of SCC.
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Received: 23 September 2003
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