A novel maraging stainless steel ultra-high-strengthened by multi-nanoprecipitations. (15th March 2023)

• Record Type: Journal Article
• Authors: Wan, Jianquan; Ruan, Haihui; Ding, Zhiyi; Kong, Ling Bing
• Is Part Of: Scripta materialia. Number 226(2023)
• Publication Date: 2023-03-15
• Subjects: Ultra-high strength -- Maraging steel -- Deformation-induced martensite transformation -- Nanoprecipitation; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2022.115224
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: A novel ultra-high strength maraging stainless steel with a chemical composition of Fe-11.5Cr-8.5Co-8.0Ni-5.0Mo-1.2Al-0.01C (in wt.%) has been developed. It utilizes a unique combination of nano scale intermetallic precipitates of Laves, β -NiAl, and sigma phases to achieve an ultra-high ultimate tensile strength up to 3.15 GPa, together with a balanced ductility and uniform elongation of about 2.74% and 2.05%, respectively. Maximizing the austenite content in the as-hot-rolled steel before cold-rolling and ageing treatments is essential to remove work-hardening behaviour and obtain an ultra-high strength without uniform elongation loss of the maraging steel. It is found that precipitation hardening sharply peaks at the ageing temperature of 525 °C for 3.5 h, which is mainly due to the peak strengthening effect of the net-like sigma phase through its transcrystalline fracture during tensile deformation. Graphical abstract: Image, graphical abstract