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应力腐蚀开裂的一种概率竞争机制
引用本文:黄彦良,侯保荣.应力腐蚀开裂的一种概率竞争机制[J].海洋与湖沼,1998,29(6):646-650.
作者姓名:黄彦良  侯保荣
作者单位:中国科学院海洋研究所!青岛,266071,中国科学院海洋研究所!青岛,266071
基金项目:中国科学院院长基金!1997号
摘    要:1998年1月,采用极化曲线,慢应变速率及扫描电镜等试验技术,研究了奥氏体不锈钢的应力腐蚀开裂。结果表明,奥氏体不锈钢在酸性氯离子溶液中处于活性阳极溶解状态,但去发生应力腐蚀开裂,其断口形貌具有解理特征。这种SCC无法用钝化膜破裂一再钝化理论和氢脆理论解释。本文以阳极溶解和表变的相互作用,激光散斑干涉术对裂纹尖端应变行为的测量,断口形貌观察等实验结果为基础,结合韧性和脆性断裂概率竞争的观点,提出了

关 键 词:不锈钢  应力腐蚀开裂  氯离子  概率竞争机制
收稿时间:1997/12/9 0:00:00
修稿时间:1998/4/28 0:00:00

A FRACTURE PROBABILITY COMPETITION MECHANISM OF STRESS CORROSION CRACKING
HUANG Yan-liang and HOU Bao-rong.A FRACTURE PROBABILITY COMPETITION MECHANISM OF STRESS CORROSION CRACKING[J].Oceanologia Et Limnologia Sinica,1998,29(6):646-650.
Authors:HUANG Yan-liang and HOU Bao-rong
Institution:Institute of Oceanology,The Chinese Academy of Sciences,Qingdao,266071;Institute of Oceanology,The Chinese Academy of Sciences,Qingdao,266071
Abstract:The stress corrosion cracking of Austenitic stainless steel was studied using the polarization technique, slow strain rate and Scanning Electoral Microscopy (SEM) techniques. A number of SCC mechanisms have been proposed, in which the hydrogen embrittlement theory and passive film rupture-repassivation theory are generally accepted. However, they cannot sufficiently explain the SCC mechanism of Austenitic stainless steel in acidic chloride solution, because the steel is in an active dissolution state in the solution, and cathodic polarization can prevent the SCC from occurring. It was found that the SCC of Austenitic Stainless Steel occurred, although the steel was in the anodic dissolution state and the morphology of the fractured surface was characterized by brittle cleavage. This kind of SCC cannot be reasonably explained by the passive film rupture-repassivation theory and by the hydrogen embrittlement theory. In this paper, a fracture probability competition mechanism of SCC was presented, on the basis of: the experimental results of the relationships between anodic dissolution and deformation; strain distribution measurement by Speckle Interferometry; and fractured surface observation combined with the viewpoint of ductile-brittle fracture competition. This kind of SCC mechanisms not only explain the propagation of SCC cracks, but also the crack initiation.
Keywords:Stainless steel Stress corrosion cracking Chloride ion Mechanism
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