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Composition design of superhigh strength maraging stainless steels using a cluster model

Progress in Natural Science:Materials International 2014年第1期24卷 35-41页

作者： Zhen Li Ruiqian Zhang Qianfeng Zha Yingmin Wang Jianbing Qiang Chuang Dong School of Mechanical Engineering Dalian University of Technology Science and Technology on Reactor Fuel and Materials Laboratory Nuclear Power Institute of China Key Laboratory of Materials Modification Dalian University of TechnologyMinistry of Education

The composition characteristics of maraging stainless steels were studied in the present work investigation using a cluster-plus-glue-atom model. The least solubility limit of high-temperature austenite to form martensite in basic Fe–Ni–Cr corresponds to the cluster formula [NiFe12]Cr3,where NiFe12is a cuboctahedron centered by Ni and surrounded by 12 Fe atoms in FCC structure and Cr serves as glue atoms. A cluster formula [NiFe12](Cr2Ni) with surplus Ni was then determined to ensure the second phase(Ni3M) precipitation,based on which new multicomponent alloys [(Ni,Cu)16Fe192](Cr32(Ni,Mo,Ti,Nb,Al,V)16) were designed. These alloys were prepared by copper mould suction casting method,then solid-solution treated at 1273 K for 1 h followed by water-quenching,and finally aged at 783 K for 3 h. The experimental results showed that the multi-element alloying results in Ni3M precipitation on the martensite,which enhances the strengths of alloys sharply after ageing treatment. Among them,the aged [(Cu4Ni12)Fe192](Cr32(Ni8.5Mo2Ti2Nb0.5Al1V1)) alloy(Fe74.91Ni8.82Cr11.62Mo1.34Ti0.67Nb0.32Al0.19V0.36Cu1.78wt%) has higher tensile strengths with YS?1456 MPa and UTS?1494 MPa. It also exhibits good corrosion-resistance in 3.5 wt% NaCl solution.

关键词： maraging stainless steels Composition design Cluster structure model Super-high strength

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Effect of Aging on Microstructure and Mechanical Property of 1900 MPa Grade maraging stainless Steel

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Journal of Materials Science & Technology 2007年第3期23卷 312-318页

作者： Kai LIU Yiyin SHAN Zhiyong YANG Jianxiong LIANG Lun LU Ke YANG Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China Graduate School of Chinese Academy of Sciences Beijing 100039 China General Research Institute for Iron and Steel Beijing 100081 China Technical Center Dongbei Special Steel Group Co. Fushun 113001 China

The 18%Ni alloy steels provide high strength and toughness, while age-hardenable or PH stainless steels also have good corrosion resistance. This paper focuses on an investigation of the heat treatment, mechanical properties and microstructural development of a new maraging stainless steel. It is reported that the heat treatment process should consist of solution treatment and cryogenic cooling to attain a fully martensitic structure, followed by aging at 813 K. This heat treatment resulted in an ultimate tensile strength of over 1900 MPa combined with good impact toughness. Transmission electron microscopy is used to show that, for the peak-aged condition （813 K/4 h）, nano-sized precipitates, e.g. Ni3Mo and/or R-phase, and a high density of dislocations were uniformly dispersed in the lath martensite matrix. The calculated yield strength, based on a revised Orowan mechanism, is in good agreement with the test data. The steel studied has an ultimate tensile strength over 1900 MPa, excellent fracture toughness, and good resistance against over-aging and relatively good corrosion resistance as well.

关键词： maraging stainless steels Precipitation High strength steels Aging treatment

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Role of Co in formation of Ni-Ti clusters in maraging stainless steel

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Journal of Materials Science & Technology 2018年第9期34卷 1671-1675页

作者： Jialong Tian M.Babar Shahzad Wei Wang Lichang Yin Zhouhua Jiang Ke Yang School of Materials Science and Engineering Northeastern University Shenyang 110004 China Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China Shenyang National Laboratoryfor Materials Science 72 Wenhua Road Shenyang 110016 China School of Metallurgy Northeastern University Shenyang 110004 China

The effect of Co addition on the formation of Ni-Ti clusters in maraging stainless steel was studied by three dimensional atom probe（3 DAP） and first-principles calculation. The cluster analysis based on the maximum separation approach showed an increase in size but a decrease in density of Ni-Ti clusters with increasing the Co content. The first-principles calculation indicated weaker Co-Ni（Co-Ti） interactions than Co-Ti（Fe-Ti） interactions, which should be the essential reason for the change of distribution characteristics of Ni-Ti clusters in bcc Fe caused by Co addition.

关键词： maraging stainless steels Ni-Ti cluster First-principles calculation Three-dimensional atom probe

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