As shown in Fig. 8(a The fracture surfaces of all the failed specimens were examined as shown in Fig. 12 (Fig. 12(a)). As shown in Fig, 12(b), the intermittent wetting by spraying tap water led to a large proportion of cleavage fracture. In contrast, transgranular cracking dominated the whole process of fracture when the specimens were fatigued in air ( Fig. l 2(c) (c) and (d) as-rolled specimen The magnification of (a) and (b) is the sameas that of (c The mechanical propertles are presented in Fig. 18

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