1516-1439-mr-21-05-e20180166.pdf - Materials Research 2018...

This preview shows page 1 - 2 out of 10 pages.

DOI: Materials Research . 2018; 21(5): e20180166 The Influence and Mechanism of Residual Stress on the Corrosion Behavior of Welded Structures Linyue Bai a , Kebin Jiang a * , Lei Gao a Received: June 26, 2017; Revised: March 04, 2018; Accepted: June 25, 2018 To study the influence of residual stress on the corrosion behavior of welded structures, methods such as residual stress measurement, microstructure observation, and corrosion morphology observation were used. The energy transformation model and corrosion-resistance constant model were utilized to reveal the mechanism of residual stress on the welded structures’ corrosion behavior. The results show that the fusion line was the region that is most heavily affected by corrosion and sustains more serious corrosion damage than other areas, resulting in the welded structure becoming a high-incidence area for corrosion cracking and failure. Residual tensile stress could reduce the activation energy and surface atomic density, and therefore decrease the corrosion resistance of the welded structures. The residual compressive stress decreased the activation energy needed by metal atoms to convert into metal ions in welded structures, and simultaneously increased the surface atomic density. The corrosion resistance of the welded structures ultimately increased owing to the combined influence of changes in activation energy and surface atomic density. Keywords: Residual stress, Welded structures, Corrosion, Energy transformation model, Corrosion-resistance constant model. * e-mail: [email protected] 1. Introduction Due to good connection performance and excellent air tightness, welding fabrication has been extensive applied in the manufacturing of steel structures 1-4 . However, the welding residual stress has great influence on the corrosion resistance of welded structures while the structures serve in a corrosive environment, thus effecting their security and service life 5-8 . Methods such as heat treatment and vibratory stress relief (VSR) are usually used to eliminate the residual stress in welded structures to reduce its effects on the structures 9-11 . However, it is difficult to eliminate the residual stress completely, especially in large-scale steel structures. Therefore, investigating the influence and mechanism of residual stress on the corrosion behavior of welded structures is important for the purpose of improving the performance of welded structures. The influences on the corrosion resistance of welded structures by residual tensile stress and residual compressive stress are different, which increases the complexity of the investigation on the influence and mechanism of residual stress on the corrosion behavior. Numerous studies have indicated that residual tensile stress can not only increase the susceptibility of welded structures to corrosion cracking and the growth rate of corrosion cracks, but can also decrease their corrosion resistance 12-15 . Compared with studies of residual tensile stress, reports on the influence of residual
Image of page 1
Image of page 2

You've reached the end of your free preview.

Want to read all 10 pages?

  • Fall '19

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Stuck? We have tutors online 24/7 who can help you get unstuck.
A+ icon
Ask Expert Tutors You can ask You can ask You can ask (will expire )
Answers in as fast as 15 minutes
A+ icon
Ask Expert Tutors