Effect of Solution Treatment on Microstructure and Properties of the SAF2507 Super Duplex Stainless Steel

摘要

Effect of solution treated temperature at 500～1100℃ on ferrite/austenite ratio and σ phase precipitation has been studied in this paper, and the tensile properties after solution treatment at 950℃ and 1050℃ is compared. The results shows that the ferrite/austenite ratio treated 1050~1100℃ is about 1:1; and the formation of a phase occurs in the ferrite or at ferrite - austenite boundary. The quantity of the a phase precipitation increases firstly and then decreases with increase of the solution treatment temperature, reaching the maximum at 900℃, and disperse at above 1050℃. Tensile tests show that the fracture is brittle divided and stretched by ductile belt at 950℃, and ductile at 1050℃.