| 摘要: |
| 奥氏体不锈钢在海洋大气环境下能够发生应力腐蚀开裂(SCC),并处于活性阳极溶解状态(曹楚南等,1992; Herbsleb et al.,1989),在该环境下于不锈钢表面可以形成酸性氯化物水介质膜(Kain1990; Gnanamoorthy,1990)。Jones(1985)根据其阳极溶解加速金属变形和变形加速阳极溶解的硏究结果,提出了应力腐蚀和腐蚀疲劳的统一机理,他认为裂尖的阳极溶解使裂尖前金属的开裂应力下降。曹楚南(1992)在此基础上更为广泛地探讨了电化学过程与金属材料的力学行为间的交互作用及其与SCC之间的关系,他认为裂尖前面有一塑性变形区,裂尖表面上的高阳极溶解电流密度除可使金属被溶解掉以外,还起着使裂尖前金属表层区的变形硬化缓解的作用。这种作用导致裂尖前金属表层开裂所需要的应力(开裂应力)降低,当开裂应力低于变形硬化层中存在的应力时,这一层就会开裂,裂尖向前跃进而形成新的裂尖表面,裂尖前金属的应力也部分消除。然后在拉应力的作用下,新的裂尖前金属区域发生新的塑性变形,形成新的变形硬化层,并重复上述过程。虽然上述具体过程有待证实,但阳极溶解在SCC过程中的重要作用是肯定的。研究阳极溶解对奧氏体不锈钢力学行为的影响将为阳极溶解型SCC机理研究提供有力证据。 |
| 关键词: 阳极溶解、奥氏体不锈钢、酸性氯离子溶液、力学 |
| DOI： |
| 分类号: |
| 基金项目:中国科学院海洋研究所调查研究报告第3058号
国家自然科学基金项目，59171055号 |
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| THE EFFECTS OF ANODIC DISSOLUTION ON MECHANICAL BEHAVIOUR OF AUSTENITIC STAINLESS STEEL IN ACIDIC CHLORIDE SOLUTION |
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Huang Yanliang1, Cao Chunan2, Lin Haichao2, Hou Baorong1
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1.Institute of Oceanology,Chinese Academy of Sciences;2.Institute of Corrosion and Protection of Metals, Chinese Academy of Sciences, State Key Laboratory of Corrosion and Protection
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| Abstract: |
| This study on the effects of anodic dissolution on the mechanical behaviour of austenitic stainless steel in acidic chloride solution showed that anodic dissolution increased the creep rate and decreased the yield strength. Analysis by thermal activation theory of deformation showed that the logarithm of creep rate and the reciprocal of yield strength both have linear relationship with the logarithm of anodic current. This finding agrees with the experimental results. |
| Key words: ANODIC DISSOLUTION, AUSTENITIC STAINLESS STEEL,ACIDIC CHLORIDE SOLUTION, MECHANICAL BEHAVIOUR |
