Toughening ultrastrong low-density steel by textured δ-ferrite lamellas

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外文摘要：By both the Charpy V-notched impact and the projectile tests,we here investigated the dynamic fracture behavior of a recently developed ultrastrong lightweight steel comprising a hierarchical martensitic matrix,dispersed ultra-fine-retained austenite grains and oriented δ-ferrite lamellas,the latter being due to high Al and Si contents employed for low-density design.This steel shows a superior combination of specific ultimate tensile strength and impact toughness to other ultrastrong steels and has successfully arrested a real steel-cored bullet shot.These are attributed to the densely textured δ-ferrite lamellas that can deflect the propagating cracks until they are trapped and enclosed besides austenite-to-martensite transformation crack closure,leading to more energy consumed before failure.These results suggest a new pathway for toughening ultrastrong lightweight steels.

外文关键词：

Ultrastrong and light steelδ-Ferrite lamellasCrack propagationToughness

作者：

Bin Hu、Guosen Zhu、Guohui Shen、Zheng Wang、Qinghua Wen、Xiao Shen、Haiwen Luo

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作者单位：

School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Xue Yuan Rd.30,Beijing 100083,China

Shougang Research Institute of Technology.Yangzhuang Street 69,Beijing 100043,China

Steel Institute,RWTH Aachen University,Intzestraße 1,52072,Aachen,Germany

基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaChina and Fundamental Research Funds for the Central Universities,China&&&&

项目编号：

51831002519040285223301806500151201910244716.9 in ChinaUS 10793932 in USA

出版年：

2024

DOI：

10.1016/j.dt.2023.05.006

防务技术

中国兵工学会

防务技术

CSTPCD

影响因子：0.358

ISSN：2214-9147

年,卷(期)：2024.32(2)

参考文献量43