Evolution of intermetallics in a 26Cr–4Mo–2Ni (Ti + Nb) super ferritic stainless steel aged at 800°C. (April 2015)

• Record Type: Journal Article
• Authors: He, M. L.; Yu, L. M.; Li, H. J.
• Is Part Of: Materials research innovations. Volume 19(2015)Supplement 1
• Page Start: S1-36
• Page End: S1-40
• Publication Date: 2015-04
• Subjects: Super ferritic stainless steel -- χ phase -- σ phase -- Microstructure; Materials -- Research -- Periodicals; Matériaux -- Recherche -- Périodiques; 620.1105
• DOI: 10.1179/1432891715Z.0000000001364
• Languages: English
• ISSNs: 1432-8917

Abstract

Abstract : The precipitation of intermetallics in a 26Cr–4Mo–2Ni (Ti + Nb) super ferritic stainless steel during aging at 800°C was investigated. Optical, scanning electron and transmission electron microscopes and X-ray diffractometer were used to characterize the microstructure. Results show that the χ phase formed in 5 min and almost disappeared within 24 h. The σ phase began to form at grain boundaries when aged for 30 min and its amount increased with prolonged aging. After 24 h, the σ phase covered the grain boundaries and grew into the grain interiors. The Laves phase was found to form within 30 min.