DataVXAdvanced Functional MaterialsPaper
journal article·2025-01Open access

A Novel B2 Precipitate Gives High Strength and High Impact Toughness to Bcc‐Structured Cryogenic Steels

Qiyuan Chen, Shuai Tang, Weina Zhang, Haile Yan, Gang Sha, Guangming Cao, Jun Chen, Zhanglong Xie, Shenbao Jin, Xiaonan Wang, Linlin Li, Zhongwu Zhang, Mingxin Huang, Sybrand van der Zwaag, Zhenyu Liu

Advanced Functional Materials· Volume 35· Issue 4
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Source abstract

Abstract

Abstract For decades, solid solution strengthening with up to 9 wt.% Ni has been the only successful strategy to obtain high strength and high impact toughness in bcc‐structured (ferritic or tempered martensitic) cryogenic steels. Until now coherent nano‐precipitates, an effective strengthening agent at room temperature, cannot be used to improve properties at cryogenic temperatures. Here, a new type of Mo‐rich nano‐B2 precipitates formed in a 6.5 wt.% Ni steel upon doping with 0.2 wt.% of Mo is reported. These precipitates are not only fully coherent with the matrix but are also shearable at 77 K. A high precipitate number density in excess of 2 × 1024 m−3 has been achieved by an industrially feasible process optimization, which brings both the cryogenic strength and impact toughness of the steel to the same levels as those of 9Ni steels. The Mo‐rich B2 precipitation strengthening, therefore, opens a new avenue for the design and development of low‐cost high‐performance cryogenic steels.
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Research context

Metals & alloys

OpenAlex topics: Microstructure and Mechanical Properties of Steels · Metal Alloys Wear and Properties · Metallurgical and Alloy Processes

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110819 China

School of Iron and Steel Soochow University Suzhou 215021 China

School of Materials Science and Engineering Northeastern University Shenyang 110819 China

School of Materials Science and Engineering Herbert Gleiter Institute of Nanoscience Nanjing University of Science and Technology Nanjing 210094 China

Nanjing Iron and Steel Co., Ltd. Nanjing 210035 China

Key Laboratory of Superlight Materials and Surface Technology Ministry of Education College of Materials Science and Chemical Engineering Harbin Engineering University Harbin 150001 China

Department of Mechanical Engineering University of Hong Kong Hong Kong 999077 China

Novel Aerospace Materials Group Faculty of Aerospace Engineering Delft University of Technology Delft 2629HS Netherlands

Funding

National Key Research and Development Program of China · National Natural Science Foundation of China · China Postdoctoral Science Foundation

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