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

被引：61

作者：

Moon, Joonoh ^{[1
]}

Ha, Heon-Young ^{[1
]}

Kim, Kyeong-Won ^{[1
]}

Park, Seong-Jun ^{[1
]}

Lee, Tae-Ho ^{[1
]}

Kim, Sung-Dae ^{[1
]}

Jang, Jae Hoon ^{[1
]}

Jo, Hyo-Haeng ^{[1
]}

Hong, Hyun-Uk ^{[2
]}

Lee, Bong Ho ^{[3
]}

Lee, Young-Joo ^{[4
]}

Lee, Changhee ^{[5
]}

Suh, Dong-Woo ^{[6
]}

Han, Heung Nam ^{[7
,8
]}

Raabe, Dierk ^{[9
]}

Lee, Chang-Hoon ^{[1
]}

机构：

[1] Korea Inst Mat Sci, Steel Dept, Adv Met Div, 797 Changwondae Ro, Chang Won 51508, Gyeongnam, South Korea

[2] Changwon Natl Univ, Dept Mat Sci & Engn, 20 Changwondaehak Ro, Chang Won 51140, Gyeongnam, South Korea

[3] Daegu Gyeongbuk Inst Sci & Technol, Ctr Core Res Facil, 333 Hyeonpung Eup, Dalseong Gun 42988, Daegu, South Korea

[4] Res Inst Ind Sci & Technol, Adv Metall Mat Res Grp, 67 Cheongam Ro, Pohang 37673, Gyeongbuk, South Korea

[5] Hanyang Univ, Div Mat Sci & Engn, Seoul 04763, South Korea

[6] Pohang Univ Sci & Technol, Grad Inst Ferrous Technol, 77 Cheongam Ro, Gyeongbuk 37673, South Korea

[7] Seoul Natl Univ, Dept Mat Sci & Engn, 1 Gwanak Ro, Seoul 08826, South Korea

[8] Seoul Natl Univ, Res Inst Adv Mat, 1 Gwanak Ro, Seoul 08826, South Korea

[9] Max Planck Inst Eisenforsch GmbH, Max Planck Str 1, D-40237 Dusseldorf, Germany

来源：

SCIENTIFIC REPORTS | 2020年 / 10卷 / 01期

基金：

新加坡国家研究基金会;

关键词：

FE-MN-AL; MECHANICAL-PROPERTIES; CORROSION-RESISTANCE; TENSILE DEFORMATION; AUSTENITIC STEELS; PASSIVE FILM; MICROSTRUCTURE; BEHAVIOR; ALLOYS; MO;

D O I：

10.1038/s41598-020-69177-7

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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 kappa -carbide. The alloying with Cr enhances the ductility without sacrificing strength, by suppressing the precipitation of kappa -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.

引用

页数：10

共 39 条

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