Mechanical Engineering Department, Amirkabir University of Technology, Tehran, Iran.
Mechanical Engineering Department, Amirkabir University of Technology, Tehran, Iran.
Ultrasonics. 2018 Aug;88:137-147. doi: 10.1016/j.ultras.2018.03.012. Epub 2018 Mar 21.
Corrosive solutions have an enormous effect on fatigue life of components in refinery industry. Several post-processing solutions are proposed to improve the weld zone, which is affected by the corrosive solutions. Ultrasonic peening (UP) is developed to enhance the fatigue life, specifically in corrosive environments and corrosion resistance of the components. The enhancement mechanism of UP is based on severe plastic deformation and reduction of tensile residual stress in weld toe. In this research, the fatigue-corrosion life of welded 316 Stainless Steel (SS) pipe is enhanced through utilizing UP process with different diameters of strikers. Fatigue-corrosion life of the weld on 316 SS and 347 SS fillers, as experimental samples, is studied in corrosive environments. This study intends to shed more light on the influence of corrosion and strength in fatigue-corrosion life of the sample materials. Therefore, this article studies the microstructure and pitting corrosion of the samples at different zones. The experimental results showed enhancement of fatigue-corrosion life after applying UP. The results revealed that welding by using 316 SS filler and UP with striker diameter of 4 mm have the highest fatigue life in the simulated HS corrosive environment.
腐蚀性溶液对炼油行业中组件的疲劳寿命有巨大影响。已经提出了几种后处理溶液来改善受腐蚀性溶液影响的焊接区。超声喷丸（UP）是为了提高疲劳寿命而开发的，特别是在腐蚀性环境和提高组件的耐腐蚀性。UP 的增强机制基于焊接趾部的剧烈塑性变形和拉伸残余应力的降低。在这项研究中，通过利用具有不同直径的冲击器的 UP 工艺来增强焊接 316 不锈钢（SS）管的疲劳-腐蚀寿命。在腐蚀性环境中研究了焊接 316SS 和 347SS 填充材料的焊缝的疲劳-腐蚀寿命。本研究旨在更深入地了解腐蚀和强度对样品材料疲劳-腐蚀寿命的影响。因此，本文研究了不同区域的样品的微观结构和点蚀腐蚀。实验结果表明，施加 UP 后疲劳-腐蚀寿命得到了提高。结果表明，在模拟 HS 腐蚀性环境中，使用 316SS 填充材料和直径为 4mm 的冲击器进行焊接具有最高的疲劳寿命。
