Fatigue Corrosion Behavior of Friction Welded Dissimilar Joints in Different Testing Conditions

Abstract

Our study will be focused on stainless steel AISI 304—carbon steel ASTM A105 joints obtained by rotary friction welding and on their fatigue corrosion behavior in different testing environments. As a first thing, the joints will be characterized by microscopy and electrochemical techniques. The manuscript will then describe the optimization of the experimental setup and the validation of the testing procedure. After that, the fatigue behavior of the joints will be tested in different aggressive environments. This study pointed out that it is possible to build a simple and low-cost setup for the study of fatigue corrosion behavior of dissimilar joints while exploiting in situ electrochemical measurements to follow the fatigue corrosion process.

Fatigue corrosion behavior of friction‐welded stainless and carbon steel dissimilar joint

“…Fatigue and corrosion fatigue tests were conducted on both alloys and direct drive friction welded joint bars using the same specimen design used in Rossi et al 39 The dimensions of the bars used were decided to obtain samples that would allow tests with standard laboratory machines. The welding processes were selected according to the diameter of the bars and the nature of the materials.…”

“…37,38 Operational conditions that are favorable to corrosion fatigue could also lead to stress corrosion cracking phenomena and to hydrogen embrittlement; therefore, the transition between these environmental-assisted processes is not so sharp; on the contrary, many features are shared between them. The fatigue behavior 39 of dissimilar welded joints is highly dependent on the surrounding environment, and corrosion phenomena can occur and develop in a wide variety of forms, depending on the composition, temperature, pH, and oxygen content of the electrolyte. This interaction is mutual, as the fatigue loading to which the sample is subjected to is also able to modify the progress of the corrosive phenomena taking place.…”

Prognosis methods of stress corrosion cracking under harsh environmental conditions

“…SCC occurs under tensile mechanical or thermal loading, and it is affected by several mechanical factors that can aggravate the severity of cracking, especially in harsh environmental conditions [ 27 ]. These mechanical factors include applied stress, stress concentration factors, residual stress, strain rate, vibrations, and cyclic loading [ 28 , 29 ].…”