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在青岛和海南进行40CrNi2Si2MoVA超高强度钢的大气暴露实验,对暴露后的材料性能以及腐蚀形貌进行了研究。结果表明,40CrNi2Si2MoVA钢在海洋性大气环境中,腐蚀以均匀腐蚀为主,随环境不同和腐蚀发展的变化,腐蚀产物成分和结构不同,主要成分是Fe3O4,Fe2O3,γ-FeOOH和α-FeOOH。腐蚀失重与时间的关系可用幂函数w=atb(b<1)回归。40CrNi2Si2MoVA钢在海洋性大气环境下具有较高的应力腐蚀敏感性,应力腐蚀为沿晶开裂模式,裂纹起源于表面产生腐蚀的部位,并向内部扩展。40CrNi2Si2MoVA钢在海南万宁的腐蚀速率以及应力腐蚀敏感性明显高于在青岛团岛的。由于环境腐蚀对材料的影响,导致其抗拉强度的损失,从而使其抗应力能力降低,在更低的强度水平和更短的时间内产生断裂。
The atmospheric exposure experiments of 40CrNi2Si2MoVA ultra-high strength steel were carried out in Qingdao and Hainan Province, and the properties of the material after exposure and the corrosion morphology were studied. The results show that the corrosion of 40CrNi2Si2MoVA steel is dominated by uniform corrosion in the marine atmosphere. The composition and structure of the corrosion products vary with different environments and corrosion development. The main components are Fe3O4, Fe2O3, γ-FeOOH and α-FeOOH. Corrosion loss and the relationship between time available power function w = atb (b <1) regression. 40CrNi2Si2MoVA steel has high sensitivity to stress corrosion under marine atmosphere. Stress corrosion is the mode of intergranular cracking. Cracks originate from the corrosion sites on the surface and extend inwardly. The corrosion rate and stress corrosion susceptibility of 40CrNi2Si2MoVA steel in Wanning, Hainan Province were significantly higher than those in Qingdao Mission Island. Due to the influence of environmental corrosion on the material, it leads to the loss of its tensile strength, so that its anti-stress ability is reduced, and the fracture is generated at a lower intensity level and in a shorter time.