Microstructural Evolutions and its Influence on Properties of Super-Duplex Stainless Steel
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.
Zhengyi Jiang and Chunliang Zhang
Y. Han et al., "Microstructural Evolutions and its Influence on Properties of Super-Duplex Stainless Steel", Advanced Materials Research, Vols. 97-101, pp. 656-659, 2010