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Abstract Through the observation of fracture morphology by electronfractography, it is shown that the fracture moprhology of steels is not governed by a single mechanism, but is strongly dependent upon interaction between stress, medium and steel. According to the corrosive action of medium to steel, there are observed the following cases: a)corrgsion is weak or absent, only striation is observed; b)when corrosion is strong, then it can be further divided into five cases: ⅰ)with general corrosion, attacked and widened striation is observed; ⅱ)with pitting corrosion, the pit was only a source of crack; ⅲ) with intergranular corrosion, characteristic intergranular corrosion striation can be observed; ⅳ) when the specimen, is sensitive to stress corrosion crac king (SCC) and K_(Imax)>K_(ISCC), the characteristic fracture morphology of SCC is. observed; ⅴ) when the specimen is sensitve to hydrogen embrittlement (HE)., characteristic HE morphology is observed, As there are several different kinds of CF mechanism, it is improper to explain all CF phenomena by one model of CF such as the superposition model or process competition model.
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Received: 25 June 1982
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