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应力腐蚀开裂(scc)是在远低于破坏极限的条件下,材料受到拉应力和特定腐蚀环境的联合作用而导致的脆性开裂。它常常会引起没有明显预兆的突发性破坏事故,造成生命和财产的灾难性后果。为了避免事故的发生,人们迫切需要了解应力腐蚀断裂的过程,区分scc裂纹的孕育期和扩展期,以防患于未然。为了研究奥氏体不锈钢在氯化镁溶液中的应力腐蚀断裂,识別孕育期和裂纹扩展期,通常采用下列方法:(1) 直接用显微镜观察裂纹;(2) 观察伴随裂纹发生发出的氢;(3) 测量电位——时间曲线;(4) 测量延伸率——时间曲线;(5) 在恒应变下测量应力松驰。但是以往的许多试验证明,用这些方法常常由于某种原因很难
Stress corrosion cracking (SCC) is a brittle fracture caused by the combined effect of tensile stress and a specific corrosive environment at well below the failure limit. Often, it causes sudden damage without obvious warning, causing disastrous consequences for life and property. In order to avoid accidents, people urgently need to understand the process of stress corrosion cracking, scc crack distinction between the incubation period and the expansion period, in case beforehand. In order to study the stress corrosion cracking of austenitic stainless steel in magnesium chloride solution, the following methods are usually used to identify the inoculation period and the crack growth period: (1) to directly observe the crack with a microscope; (2) to observe the hydrogen that accompanies the crack initiation; 3) measuring the potential-time curve; 4) measuring the elongation-time curve; and 5) measuring the stress relaxation under constant strain. However, many previous experiments have shown that it is often difficult to use these methods for some reason