Effect of Continuous Cooling on Secondary Phase Precipitation in the Super Duplex Stainless Steel ZERON-100

• Published in: Journal of materials engineering and performance Vol. 22; no. 12; pp. 3860 - 3866
• Main Authors: Calliari, Irene, Bassani, Paola, Brunelli, Katya, Breda, Marco, Ramous, Emilio
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01.12.2013; Springer
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Corrosion and Coatings; Cross-disciplinary physics: materials science; rheology; Engineering Design; Exact sciences and technology; Materials Science; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Physics; Precipitation; Quality Control; Reliability; Safety and Risk; Tribology; secondary phases; continuous cooling; SDSS; Sigma phase; Volume fraction; Cooling rate; Solution heat treatment; Precipitation; Thermodynamic model; Phase equilibria; Duplex stainless steel; Chemical composition; Property structure relationship; Microstructure
• ISSN: 1059-9495; 1544-1024
• DOI: 10.1007/s11665-013-0689-6

The precipitation of secondary phases in super duplex stainless steels (SDSS) is a subject of great relevance owing to their dangerous effects on both mechanical and corrosion-resistance properties. This paper examines the effect of continuous cooling after solution annealing treatment on secondary phase precipitation in the ZERON-100 SDSS. It considers the influence of cooling rate on volume fraction, morphology and chemical composition. It has been found that the formation of sigma and chi phases can be avoided only at cooling rates higher than 0.7 °C/s. In addition, at the lowest cooling rate the sigma phase amount approaches the equilibrium value, but the chi phase amount remains significantly low.