Cited 4 time in webofscience Cited 3 time in scopus

A new class of lightweight, stainless steels with ultra-high strength and large ductility

Title
A new class of lightweight, stainless steels with ultra-high strength and large ductility
Authors
Moon, JoonohHa, Heon-YoungKim, Kyeong-WonPark, Seong-JunLee, Tae-HoKim, Sung-DaeJang, Jae HoonJo, Hyo-HaengHong, Hyun-UkLee, Bong HoLee, Young-JooLee, ChangheeSuh, Dong-WooHan, Heung NamRaabe, DierkLee, Chang-Hoon
Issue Date
2020-07
Citation
Scientific Reports, 10(1), 12140
Type
Article
Article Type
Article
Keywords
FE-MN-ALMECHANICAL-PROPERTIESCORROSION-RESISTANCETENSILE DEFORMATIONAUSTENITIC STEELSPASSIVE FILMMICROSTRUCTUREBEHAVIORALLOYSMO
ISSN
2045-2322
Abstract
Steel is the global backbone material of industrialized societies, with more than 1.8 billion tons produced per year. However, steel-containing structures decay due to corrosion, destroying annually 3.4% (2.5 trillion US$) of the global gross domestic product. Besides this huge loss in value, a solution to the corrosion problem at minimum environmental impact would also leverage enhanced product longevity, providing an immense contribution to sustainability. Here, we report a leap forward toward this aim through the development of a new family of low-density stainless steels with ultra-high strength (> 1 GPa) and high ductility (> 35%). The alloys are based on the Fe–(20–30)Mn–(11.5–12.0)Al–1.5C–5Cr (wt%) system and are strengthened by dispersions of nano-sized Fe3AlC-type κ-carbide. The alloying with Cr enhances the ductility without sacrificing strength, by suppressing the precipitation of κ-carbide and thus stabilizing the austenite matrix. The formation of a protective Al-rich oxide film on the surface lends the alloys outstanding resistance to pitting corrosion similar to ferritic stainless steels. The new alloy class has thus the potential to replace commercial stainless steels as it has much higher strength at similar formability, 17% lower mass density and lower environmental impact, qualifying it for demanding lightweight, corrosion resistant, high-strength structural parts. © 2020, The Author(s).
URI
http://hdl.handle.net/20.500.11750/12335
DOI
10.1038/s41598-020-69177-7
Publisher
Nature Publishing Group
Files:
Collection:
ETC1. Journal Articles


qrcode mendeley

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE