Quenching and flash-partitioning enables austenite stabilization during press-hardening processing. (15th March 2020)

• Record Type: Journal Article
• Authors: Cai, H.L.; Chen, P.; Oh, J.K.; Cho, Y.R.; Wu, D.; Yi, H.L.
• Is Part Of: Scripta materialia. Number 178(2020)
• Page Start: 77
• Page End: 81
• Publication Date: 2020-03-15
• Subjects: Quenching and flash-partitioning -- Auto-tempering -- Press-hardened steel -- Retained austenite -- Ductility; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2019.10.047
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Quenching and flash-partitioning (Q&FP) concept is proposed based upon carbon diffusion associated with the martensitic transformation. For the Si-added steel having an elevated martensite start ( M s ) temperature, carbon can diffuse rapidly from martensite laths into their adjacent austenite within only a few seconds during the martensitic transformation, to replace carbides precipitation by auto-tempering in the Si-free steel. Elevating M s in alloy design based on the Q&FP concept enables the stabilization of retained austenite during press hardening. The transformation-induced plasticity effect of retained austenite films improved the total elongation of press-hardened steel to 10.5% combining with 1660 MPa tensile strength. Graphical abstract: Image, graphical abstract