Super-strong dislocation-structured high-carbon martensite steel

Abstract High-carbon martensite steels (with C > 0.5 wt.%) are very hard but at the same time as brittle as glass in as-quenched or low-temperature-tempered state. Such extreme brittleness, originating from a twin microstructure, has rendered these steels almost useless in martensite state. There...

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Autores principales:	Jun-jie Sun, Yong-ning Liu, Yun-tian Zhu, Fu-liang Lian, Hong-ji Liu, Tao Jiang, Sheng-wu Guo, Wen-qing Liu, Xiao-bing Ren
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/af26a5b8bb284d669a4c8e0d6acf9253
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spelling	oai:doaj.org-article:af26a5b8bb284d669a4c8e0d6acf92532021-12-02T12:30:11ZSuper-strong dislocation-structured high-carbon martensite steel10.1038/s41598-017-06971-w2045-2322https://doaj.org/article/af26a5b8bb284d669a4c8e0d6acf92532017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-06971-whttps://doaj.org/toc/2045-2322Abstract High-carbon martensite steels (with C > 0.5 wt.%) are very hard but at the same time as brittle as glass in as-quenched or low-temperature-tempered state. Such extreme brittleness, originating from a twin microstructure, has rendered these steels almost useless in martensite state. Therefore, for more than a century it has been a common knowledge that high-carbon martensitic steels are intrinsically brittle and thus are not expected to find any application in harsh loading conditions. Here we report that these brittle steels can be transformed into super-strong ones exhibiting a combination of ultrahigh strength and significant toughness, through a simple grain-refinement treatment, which refines the grain size to ~4 μm. As a result, an ultra-high tensile strength of 2.4~2.6 GPa, a significant elongation of 4~10% and a good fracture toughness (K1C) of 23.5~29.6 MPa m1/2 were obtained in high-carbon martensitic steels with 0.61–0.65 wt.% C. These properties are comparable with those of “the king of super-high-strength steels”—maraging steels, but achieved at merely 1/30~1/50 of the price. The drastic enhancement in mechanical properties is found to arise from a transition from the conventional twin microstructure to a dislocation one by grain refinement. Our finding may provide a new route to manufacturing super-strong steels in a simple and economic way.Jun-jie SunYong-ning LiuYun-tian ZhuFu-liang LianHong-ji LiuTao JiangSheng-wu GuoWen-qing LiuXiao-bing RenNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-7 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jun-jie Sun Yong-ning Liu Yun-tian Zhu Fu-liang Lian Hong-ji Liu Tao Jiang Sheng-wu Guo Wen-qing Liu Xiao-bing Ren Super-strong dislocation-structured high-carbon martensite steel
description	Abstract High-carbon martensite steels (with C > 0.5 wt.%) are very hard but at the same time as brittle as glass in as-quenched or low-temperature-tempered state. Such extreme brittleness, originating from a twin microstructure, has rendered these steels almost useless in martensite state. Therefore, for more than a century it has been a common knowledge that high-carbon martensitic steels are intrinsically brittle and thus are not expected to find any application in harsh loading conditions. Here we report that these brittle steels can be transformed into super-strong ones exhibiting a combination of ultrahigh strength and significant toughness, through a simple grain-refinement treatment, which refines the grain size to ~4 μm. As a result, an ultra-high tensile strength of 2.4~2.6 GPa, a significant elongation of 4~10% and a good fracture toughness (K1C) of 23.5~29.6 MPa m1/2 were obtained in high-carbon martensitic steels with 0.61–0.65 wt.% C. These properties are comparable with those of “the king of super-high-strength steels”—maraging steels, but achieved at merely 1/30~1/50 of the price. The drastic enhancement in mechanical properties is found to arise from a transition from the conventional twin microstructure to a dislocation one by grain refinement. Our finding may provide a new route to manufacturing super-strong steels in a simple and economic way.
format	article
author	Jun-jie Sun Yong-ning Liu Yun-tian Zhu Fu-liang Lian Hong-ji Liu Tao Jiang Sheng-wu Guo Wen-qing Liu Xiao-bing Ren
author_facet	Jun-jie Sun Yong-ning Liu Yun-tian Zhu Fu-liang Lian Hong-ji Liu Tao Jiang Sheng-wu Guo Wen-qing Liu Xiao-bing Ren
author_sort	Jun-jie Sun
title	Super-strong dislocation-structured high-carbon martensite steel
title_short	Super-strong dislocation-structured high-carbon martensite steel
title_full	Super-strong dislocation-structured high-carbon martensite steel
title_fullStr	Super-strong dislocation-structured high-carbon martensite steel
title_full_unstemmed	Super-strong dislocation-structured high-carbon martensite steel
title_sort	super-strong dislocation-structured high-carbon martensite steel
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/af26a5b8bb284d669a4c8e0d6acf9253
work_keys_str_mv	AT junjiesun superstrongdislocationstructuredhighcarbonmartensitesteel AT yongningliu superstrongdislocationstructuredhighcarbonmartensitesteel AT yuntianzhu superstrongdislocationstructuredhighcarbonmartensitesteel AT fulianglian superstrongdislocationstructuredhighcarbonmartensitesteel AT hongjiliu superstrongdislocationstructuredhighcarbonmartensitesteel AT taojiang superstrongdislocationstructuredhighcarbonmartensitesteel AT shengwuguo superstrongdislocationstructuredhighcarbonmartensitesteel AT wenqingliu superstrongdislocationstructuredhighcarbonmartensitesteel AT xiaobingren superstrongdislocationstructuredhighcarbonmartensitesteel
_version_	1718394417935548416

Super-strong dislocation-structured high-carbon martensite steel

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