Evaluación ultrasónica de las fases formadas de un acero inoxidable dúplex 2205 tratado térmicamente a 750 °C y su comportamiento frente a la corrosión

Paola Trocoli-Montesino; Edda Rodríguez-Prato; Adalberto Rosales-Mendoza; Wilfrido González-Hermosilla

doi:10.3989/revmetalm.135

Authors

Paola Trocoli-Montesino Universidad Simón Bolívar, Dpto. de Ciencias de los Materiales https://orcid.org/0000-0002-1080-7153
Edda Rodríguez-Prato Universidad Simón Bolívar, Dpto. de Ciencias de los Materiales https://orcid.org/0000-0002-7853-9722
Adalberto Rosales-Mendoza Universidad Simón Bolívar, Dpto. de Ciencias de los Materiales https://orcid.org/0000-0003-0355-6525
Wilfrido González-Hermosilla Universidad Simón Bolívar, Dpto. de Ciencias de los Materiales https://orcid.org/0000-0002-2532-842X

DOI:

https://doi.org/10.3989/revmetalm.135

Keywords:

Corrosion, Duplex stainless steel 2205, Heat treatment, Phase Chi, Phase Sigma, Ultrasonic testing

Abstract

The aim of this study is to investigate the behavior of the ultrasonic parameters in a duplex stainless steel type 2205 (UNS31803/EN1.4462) through aging heat treatments at 750 °C during different times. The main objective is to promote the precipitation of secondary phases, especially chi (χ) and sigma (σ). The microstructural evolution was studied using optical microscopy and scanning electron microscopy and afterwards the specimens were evaluated using the ultrasonic pulse echo technique. Electrochemical experiments were carried out to evaluate the uniform and localized corrosion resistance of the specimens. The results revealed that the relative amounts of χ and σ phases increase with the time of heat treatment at ferrite/ferrite and ferrite/austenite grain boundaries, especially inside the ferritic grain. The longitudinal wave velocity and the attenuation coefficient presented a trend that coincides with the microstructural changes generated by the effect of the heat treatment. The electrochemical evaluation revealed a high resistance to uniform corrosion; however, the results showed a correlation between the increase in aging treatment time and the loss of localized corrosion resistance.

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