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一、引言高强度钢在较低的工作应力和腐蚀性介质的共同作用下,将可能引发材料原先具有的缺陷而形成裂纹,并能促进裂纹的扩展.七十年代以来的研究表明:裂纹扩展率通常有一段与力学因素无关的扩展率被控制阶段,因此,此阶段的裂纹扩展率必然受到一系列化学的和物理的步骤中最慢的一个步骤所控制.验证出控制步骤将大大有助于了解介质促进裂纹扩展的机理.
I. INTRODUCTION High-strength steel under the combined effect of lower working stress and corrosive medium may lead to the formation of cracks in the original defects of the material and promote the propagation of cracks. Studies from the 1970s have shown that crack propagation The rate usually has a stage of control over which the rate of expansion independent of the mechanical factor is controlled and therefore the rate of crack propagation at this stage must be governed by the slowest of a series of chemical and physical steps. To understand the mechanism of medium to promote crack growth.