Influence of severe plastic deformation on fatigue life applied by ultrasonic peening in welded pipe 316 Stainless Steel joints in corrosive environment

B Fereidooni; M R Morovvati; S A Sadough-Vanini

doi:10.1016/j.ultras.2018.03.012

Influence of severe plastic deformation on fatigue life applied by ultrasonic peening in welded pipe 316 Stainless Steel joints in corrosive environment

Ultrasonics. 2018 Aug:88:137-147. doi: 10.1016/j.ultras.2018.03.012. Epub 2018 Mar 21.

Authors

B Fereidooni¹, M R Morovvati², S A Sadough-Vanini¹

Affiliations

¹ Mechanical Engineering Department, Amirkabir University of Technology, Tehran, Iran.
² Mechanical Engineering Department, Amirkabir University of Technology, Tehran, Iran. Electronic address: reza.morovvati@gmail.com.

PMID: 29649656
DOI: 10.1016/j.ultras.2018.03.012

Abstract

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 H₂S corrosive environment.

Keywords: Corrosive environment; Fatigue corrosion; Severe plastic deformation; Ultrasonic peening; Welded pipe joints.