The origin of the brittleness of high aluminum pearlite and the method for improving ductility. (November 2016)

• Record Type: Journal Article
• Authors: Chen, P.; Xiong, X.C.; Wang, G.D.; Yi, H.L.
• Is Part Of: Scripta materialia. Volume 124(2016)
• Page Start: 42
• Page End: 46
• Publication Date: 2016-11
• Subjects: Spheroidization -- κ-carbide -- ductility -- Low density steels; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2016.06.031
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: High aluminum bearing steels demonstrate poor ductility due to the presence of κ-pearlite in the as hot-rolled condition. The addition of aluminum shifts the equilibrium eutectoid carbon concentration to a higher value. Consequently, the poor ductility of high aluminum pearlite is believed to originate from the brittleness of κ-pearlite due to the higher fraction of brittle κ-carbide. The spheroidization treatment of κ-carbide is proposed and proven for the first time to improve the ductility by reducing the stress concentration at the carbide/ferrite interface and enhancing the cracking resistance of κ-carbide due to its spheroidized morphology. Graphical abstract: