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Abstract Hydrogen induced cleavage fracture for Fe-3% si single crystal and polycrystals was investigated. The results showed that a cleavage fracture occurred during dynamic charging at the slow strain rate test or under constant load at room temperature, and hydrogen induced cracking under a Ⅰ+Ⅱ combined loading propagated along the(001)cleavage plane insead of the direction predicted on the basis of the fracture criterion under the combined loading. Macroscopic hydrogen intergranular fracture was a result of cleavage fracture along the (100), (010) and (001) planes in the immediate vicinity of the grain boundary. For the Fe-Si single crystal,da/dt vs K_1 curve also consisted of three parts and the plateau velocity under mode Ⅰ loading was larger than that under combined loading. Fractographic study and stress analysis indicated that a set of the<001> Sessile dislocation was just acleavage microcrack for the Fe-Si alloy. Hydrogen carried by the gliding dislocations would enter into the microcrack and the hydrogen pressure in the mierocrack could augment the external stress and promote the formation of a stable cleavage crack.
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Received: 25 April 1987
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