Advanced high strength steel (AHSS) development through chemical patterning of austenite. (15th March 2018)

• Record Type: Journal Article
• Authors: Sun, W.W.; Wu, Y.X.; Yang, S.C.; Hutchinson, C.R.
• Is Part Of: Scripta materialia. Number 146(2018)
• Page Start: 60
• Page End: 63
• Publication Date: 2018-03-15
• Subjects: Advanced high strength steels (AHSS) -- Pearlite -- Retained austenite -- TRIP; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2017.11.007
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: A new approach for the development of medium Mn AHSS is proposed in this work. It exploits a fine scale (~ 100 nm) chemical patterning of Mn in austenite that may be obtained by the austenitisation of a pearlite structure formed under conditions with strong Mn partitioning between ferrite and cementite. The resulting 'ghost pearlite' ferrite/austenite can be subsequently treated to exhibit an interesting combination of ultimate tensile strength (UTS) (1600–2100 MPa) and ductility (7–10% elongation). The simple steel composition and very short processing provides a UTS-ductility combination similar to maraging steels and super bainitic steels. Graphical abstract: Image 1