Influence of boron on phosphorus grain boundary segregation behaviour in high-strength interstitial free steels. (December 2015)

• Record Type: Journal Article
• Authors: Song, X. L.; Lian, R. B.; Peng, K.; Liu, B.; Jia, J.; Liu, J.; Yuan, Z. X.
• Is Part Of: Materials research innovations. Volume 19(2015)Supplement 10
• Page Start: S10-225
• Page End: S10-229
• Publication Date: 2015-12
• Subjects: Interstitial free steel -- Grain boundary segregation -- Boron -- Phosphorus -- Grain boundary character; Materials -- Research -- Periodicals; Matériaux -- Recherche -- Périodiques; 620.1105
• DOI: 10.1179/1432891715Z.0000000002152
• Languages: English
• ISSNs: 1432-8917

Abstract

Abstract : Boron and phosphorus segregated at grain boundary are investigated by auger electron spectroscopy in high-strength interstitial free steels. The results show that the segregated concentration of phosphorus at grain boundaries reduces greatly with increasing the contents of boron in the high-strength interstitial free steels. The segregation concentration of phosphorus at grain boundary is about 14 at.-% for the boron-free high-strength steel. For the boron-bearing high-strength interstitial free steel, the segregation concentration of phosphorus at grain boundary is about 2–4 at.-%, and the boron concentration at grain boundary is about 5–14 at.-%. The fracture morphology of the steels indicates that almost all grains are intergranular fracture for the boron-free high-strength interstitial free steel. The intergranular fracture grains reduced greatly for the boron-bearing interstitial free steel. The number of low-angle grain boundaries increased with the increasing of boron in the high-strength interstitial free steels.