Fatigue Analysis of Threaded Components with Cd and Zn-Ni Anticorrosive Coatings

Author(s)

Marcelino dos Santos, Jefferson Rodrigo ^[1] ; Fernandes, Martin Ferreira ^[1] ; Velloso, Veronica Mara de Oliveira ^[1] ; Voorwald, Herman Jacobus Cornelis ^[1]

Affiliation

^[1] Sao Paulo State Univ Unesp, Sch Engn, Dept Mat & Technol, Fatigue & Aeronaut Mat Res Grp, BR-12516410 Guaratingueta, SP - Brazil

• Document type: Journal article
• Source: METALS; v. 11, n. 9 SEP 2021.
• Web of Science Citations: 0

Abstract

The influence of the electrodeposition of cadmium and zinc-nickel and the stress concentration effect on the fatigue behavior of AISI 4140 steel threaded components were studied. Axial fatigue tests at room temperature with a stress ratio of R = 0.1 were performed using standard and threaded specimens with and without nut interface under base material, cadmium, and zinc-nickel-coated conditions. Finite element analysis (FEA) was used, considering both elastic and elastoplastic models, to quantify the stress distribution and strain for threaded specimens with and without a nut interface. The numeric results were correlated to the experimental fatigue data of threaded components with and without the nut interface, to allow the oil \& gas companies to extrapolate the results for different thread dimensions, since the experimental tests are not feasible to be performed for all thread interfaces. Scanning electron microscopy (SEM) was used to analyze the fracture surfaces. The stress concentration factor had a greater influence on the fatigue performance of threaded components than the effect of the Cd and Zn-Ni coatings. The fatigue life of studs reduced by about 58% with the nut/stud interface, compared to threaded components without nuts. The elastoplastic FEA results showed that studs with a stud/nut interface had higher stress values than the threaded specimens without a nut interface. The FEA results showed that the cracks nucleated at the regions with higher strain, absorbed energy, and stress concentration. The substitution of Cd for a Zn-Ni coating was feasible regarding the fatigue strength for threaded and smooth components. (AU)

• FAPESP's process: 17/05619-0 - Analysis of the fatigue behavior of a Zinc-Nickel alloy coating as a substitution of electrodeposited cadmium for AISI 4140 steel
• Grantee: Martin Ferreira Fernandes
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• FAPESP's process: 19/02125-1 - Study of a nanostructured Cr/CrN coating and dwell effect influence on the fatigue behavior of Ti-6Al-4V alloy at a temperature of 350°C
• Grantee: Martin Ferreira Fernandes
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)