Pitting Damage Growth Behavior near the Weld Seam of 304 Stainless Steel
摘 要
在Simufact Welding软件中模拟了304不锈钢管路焊接过程,得到了焊缝附近外表面残余应力分布情况,在ABAQUS软件中分析了单个点蚀坑中的应力集中程度,分析了应力集中系数与点蚀坑形状的关系,在此基础上,提出了应力作用下点蚀速率和点蚀坑形状的变化规律。结果表明:应力作用下,试样的腐蚀倾向和腐蚀速率均增加;受应力影响,点蚀坑通常在垂直于主应力的方向发展更快,可能逐渐形成垂直于主应力的扁平型点蚀坑甚至发展成为裂纹;应力必须要达到一定数值才会对腐蚀有明显的影响,对于304不锈钢半球形点蚀损伤,残余应力达到100 MPa就可能对点蚀损伤发展造成明显影响。
Abstract
The 304 stainless steel pipeline welding process was simulated in Simufact Welding software, and the residual stress distribution on the outer surface near the weld was obtained. In the ABAQUS software, the stress concentration in a single pit was analyzed, and the relationship between the stress concentration factor and the shape of the pit was also analyzed, and the change rule of pitting corrosion rate and pitting pit shape under stress was put forward. The results showed that the corrosion tendency and corrosion rate of the sample increased under the action of stress. Affected by stress, pits usually corroded faster in the direction perpendicular to the principal stress, and gradually formed flat pitting pits perpendicular to the principal stress or even developed into cracks. The stress must reach a certain value to have a significant effect on corrosion. For 304 stainless steel hemispherical pitting damage, a residual stress of 100 MPa might have a significant impact on the development of pitting damage.
中图分类号 TG174 DOI 10.11973/fsyfh-202110014
所属栏目 应用技术
基金项目 青年科技基金项目(2016SY27A0001)
收稿日期 2020/2/15
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联系人作者付云伟(fywoec@163.com)
引用该论文: FU Yunwei,XU Dongsheng,LI Zengguang,ZHANG Lijun,XU Feiran. Pitting Damage Growth Behavior near the Weld Seam of 304 Stainless Steel[J]. Corrosion & Protection, 2021, 42(10): 74
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参考文献
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【4】唐子龙. 孔蚀发展过程动力学分析[J]. 中国腐蚀与防护学报, 1998, 18(4):241-250.
【5】KIMS, BURS J T, GANGFFR P. Fatigue crack formation and growth from localized corrosion in Al-Zn-Mg-Cu[J]. Engineering Fracture Mechanics, 2009, 76(5):651-667.
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