The Influence of Ni Content on the Weldability, Mechanical, and Pitting Corrosion Properties of a High-Nickel-Bearing Supermartensitic Stainless Steel

Autor(es)

Rodrigues, C. A. D. ^[1] ; Bandeira, R. M. ^[1] ; Duarte, B. B. ^[1] ; Tremiliosi-Filho, G. ^[1] ; Roche, V ^[2] ; Jorge, Jr., A. M. ^{[3, 2]}

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Chem Sao Carlos, 400 Ave Trabalhador Saocarlense, BR-13566590 Sao Carlos, SP - Brazil

^[2] Univ Grenoble Alpes, Univ Savoie Mt Blanc, CNRS, LEPMI, Grenoble INP, F-38000 Grenoble - France

^[3] Univ Fed Sao Carlos, Dept Mat Engn, Rodovia Washington Luiz, Km 235, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Materials Engineering and Performance; v. 30, n. 4, p. 3044-3053, APR 2021.
• Citações Web of Science: 0

Resumo

In this study, the effect of nickel content in two kinds of supermartensitic stainless steels, the new composition SMSS + Ni and already known SMSS-Ni, is compared concerning their mechanical properties as a function of tempering temperatures. The SMSS + Ni showed a microstructure composed of well-distributed thin martensite within austenite. In contrast, in the SMSS-Ni, there was much less austenite, and martensite was thicker, thus exposing it more to the environment. Therefore, one observed that the thinner the martensite, the higher the hardness and tensile stresses, and the lower the ductility. Overall, tempered samples at 620 degrees C presented better toughness. Therefore, the weldability of the steel SMSS + Ni was also analyzed in this tempering temperature condition, presenting excellent welding performance. However, after welding, there was an increase in austenite and thickening of martensite laths in the heat-affected zone (HAZ), leading to its poor distribution within austenite. Corrosion properties were studied comparing both kinds of steels tempered at 620 degrees C, which was also performed in the steel SMSS + Ni in the welded condition. It was observed that the better the distribution of martensite, the better the corrosion properties. The pitting potential for the SMSS + Ni was the lowest; its polarization curve was positioned in a nobler region, with lower corrosion potential and corrosion current density than these for the SMSS-Ni and in its welded condition. (AU)

• Processo FAPESP: 13/16930-7 - Eletrocatálise V: processos eletrocatalíticos de interconversão entre as energias química e elétrica
• Beneficiário: Edson Antonio Ticianelli
• Modalidade de apoio: Auxílio à Pesquisa - Temático