Microstructural Evolutions and its Influence on Properties of Super-Duplex Stainless Steel

Abstract:

Color-optical microscopy, energy spectrum analysis, hardness measuring, tensile and corrosion testing were conducted to investigate characteristics of microstructure, mechanical properties and corrosion resistance of S32750 super-duplex stainless steel aged at 850～920°C. The results indicate that with the increase of aging temperature and aging time the content of σ phase increases, while the ferrite content decreases. The forming and growing of σ phase obtained during aging causes an increase in hardness and a reduction in ductility of the aged steel. Moreover, increasing aging time the corrosion resistance reduces, owing to a new formed austenite occurs.

• Periodical: Advanced Materials Research (Volumes 97-101)
• Pages: 656-659
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.97-101.656
• Online since: March 2010
• Authors: Ying Han, De Ning Zou, Hong Hong Yao, Wei Zhang, Jun Hui Yu
• Keywords: Aging Treatment, Corrosion Resistance, Elongation, Super-Duplex Stainless Steel, σ Phase

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