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Abstract Hydrogen induced cracking in Fe-3％ Si single crystals under mode Ⅱ loading was investigated. The results showed that hydrogen could promote cleavage fracture occurring on a(001)plane, no matter what the orientation, of tensile loading axis was, and if it was along a[001] or [T10] direction the normalized threshold stress intensity K_(ⅡH)/K_(ⅡX) had a minimum value while the maximum value was obtained when the tensile loading axis was nearly along [T11]。Some hydrogen induced secondary cracks were found in which there were evident relative displacements normal or/and parallel to the cracking direction on both sides of the secondary crack。This is due to the unequal number of screw and/or edge dislocations slipping out or in both sides of the secondary crack, i. e. severe local plastic deformaton occurs during hydrogen induced cleavage cracking.The reason for hydrogen promoting cleavage cracking was discussde。
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Received: 25 February 1987
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[7] Wang, Y. B. (王燕斌); Chu, W. Y. (褚武扬); Hsiao, C. g. (肖纪美), Scripta Metall., 19, 1161(1985)
[8] Wang, Y. B. (王燕斌); Chu, W. Y. (褚武扬); Hsiao, C. M. (肖纪美) Scrip ta Metall., 19, 1165(1985)
[9] Zhang, T. Y. (张统一); Chu, W. Y. (褚武扬); Li, Y. (李英); Hsiao. C. M. (肖纪美), Metall. Trans. A, 16A, 717(1986)
[10] Zhang, T.Y.(张统一); Jiang, F. X. (蒋方忻); Chu, W. Y. (褚武扬); Hsiao, C.M. (肖纪美), Metall Trans. A, 15A, 1655(1985)
[11] Zhang, T. Y. (张统一); Jiang, F. X. (蒋方忻); Chu, W. Y. (褚武扬); Hsiaq C. M. (肖纪美), Scripta Metall., 20(4) , 503(1986) |
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