This paper presents experimental studies on the mechanical properties and low-cycle fatigue behaviour of corroded austenitic stainless steel (3 0 4) and ferritic stainless steel (4 3 0). Tensile and low-cycle fatigue tests are conducted on 28 specimens. The corrosion process of the specimens is finished by using salt spray and dry/wet cycle tests. In the tensile tests, the key parameters of the constitutive model proposed by both Rasmussen and Gardner were obtained for austenitic stainless steel (3 0 4) and ferritic stainless steel (4 3 0). In the low-cycle fatigue test, the relationships of the stress amplitude and fatigue life of the specimens were obtained. The relationships of the mass loss, corrosion rate and cross-sectional area loss with the corrosion time are established. The influences of corrosion pits and fatigue cracks on the low-cycle fatigue behaviour of these two materials are studied through both macro and micro fracture morphology analysis. It is found that compared with the salt spray, the dry/wet cycle condition causes more degradation on the strength and fatigue life of the ferritic stainless steel (4 3 0). The stress concentration and notch effect of corrosion pits are the main reasons for the degradation in fatigue life of ferritic stainless steel (4 3 0). Moreover, current codes Eurocode 3 (EC3), Australian Standard (AS), BSI Standard (BSI) and DNV Standard (DNV) could not provide accurate fatigue life assessment for these two materials after salt spray and dry/wet cycle corrosions.

本文介绍了腐蚀奥氏体不锈钢（3  0 4）和铁素体不锈钢（4 3 0）的力学性能和低周疲劳行为的实验研究。对 28 个试样进行了拉伸和低周疲劳试验。试样的腐蚀过程通过盐雾和干湿循环试验完成。在拉伸试验中，获得了拉斯穆森和加德纳提出的奥氏体不锈钢（3 0 4）和铁素体不锈钢（4 3 0）本构模型的关键参数。在低周疲劳试验中，得到了试样的应力幅值与疲劳寿命的关系。质量损失的关系，       建立腐蚀速率和横截面积损失随腐蚀时间的变化。通过宏观和微观断口形貌分析，研究了腐蚀坑和疲劳裂纹对这两种材料低周疲劳行为的影响。研究发现，与盐雾相比，干/湿循环条件对铁素体不锈钢（4 3 0）的强度和疲劳寿命造成的影响更大。 腐蚀坑的应力集中和缺口效应是铁素体不锈钢(4 30)疲劳寿命下降的主要原因此外，当前代码 Eurocode 3 (EC3)、澳大利亚标准 (AS)、BSI 标准 (BSI) 和 DNV 标准 (DNV) 无法为这两种材料在盐雾和干/湿循环腐蚀后提供准确的疲劳寿命评估。