Study of Sigma Phase in Duplex SAF 2507

4th International Conference on Advanced Materials Science and Technology

Fellicia, D.M.^1 ; Sutarsis^1 ; Kurniawan, B.A.^1 ; Wulanari, D.^1 ; Purniawan, A.^1 ; Wibisono, A.T.^1

Department of Materials and Metallurgical Engineering, Faculty of Industrial Technology, Institut Teknologi Sepuluh Nopember (ITS), Surabaya

60111, Indonesia^1

关键词: Chromium carbide;    Excellent corrosion resistances;    High temperature;    SAF 2507;    Sigma phase;    Solution annealing;    Super duplex;    Super duplex stainless steel;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/202/1/012039/pdf
DOI  :  10.1088/1757-899X/202/1/012039

来源: IOP

【 摘 要 】

Super duplex stainless steel is one of the stainless steel which has a combination between high strength properties and excellent corrosion resistance. However, the resistance can decrease by precipitation of sigma phase which is formed at high temperature, for example after welding processes. A series of experiments has been performed to study the effect of solution annealing to existence of sigma phase on super duplex SAF 2507. Variations of solution-annealing temperatures were 1000 °C, 1065 °C and 1125 °C with holding time of 15 and 30 minutes for each temperature. Effect of solution annealing process was characterized by using XRD, SEM, and Optical Microscopy. The result showed precipitation of sigma phase completely dissolved at 1065 °C and 1125 °C because it reformed to austenite. After it was heated at 1065 °C, chromium carbide appeared in ferrite site and grain boundary. The amount of chromium carbide increased with the increasing of solution annealing temperature.