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Roles of nanoscale precipitates and metastable austenite in determining strength and toughness of high-strength Nb-bearing steel

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Journal of Iron and Steel Research International 2022年第10期29卷 1646-1658页

作者： Qi-bin Ye Cheng Zhou Jun Hu Xiao-lan Gong Yong Tian Xiu-hua Gao Zhao-dong Wang State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang110819LiaoningChina

The effects of tempering temperature on the microstructure and mechanical properties of high-strength structural steel containing niobium were investigated to examine the roles of nanoscale precipitates and metastable austenite in determining the yield strength and *** hot-rolling and quenching,three experimental steels were tempered at 590,630,and 670℃.During tempering,nanoscale Nb(C,N)precipitates were formed with the recovery of quenched *** average diameters of Nb(C,N)precipitates increased from 5.4 to 8.2 nm as the tempering temperature was ***,reversed austenite with a volume fraction of 9%was formed at tempering temperatures up to 670℃.The yield strengths of steel containing tempered martensite tempered at 590 and 630℃ were 965 and 831 MPa,and the tensile strengths were 998 and 879 MPa,***,the steel comprising reversed austenite and tempered martensite tempered at 670℃ showed continuous yielding behavior,affording yield and tensile strengths of 610 and 889 MPa,*** impact energy increased from 105 to 260 J at−60℃ with increasing tempering *** austenite improves low-temperature toughness by significantly increasing the crack propagation energy.

关键词： High-strength structural steel Tempering nanoscale precipitate Metastable austenite Mechanical property

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A novel Cu-doped high entropy alloy with excellent comprehensive performances for marine application

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Journal of Materials Science & Technology 2021年第10期69卷 48-59页

作者： Yuan Yu Nannan Xu Shengyu Zhu Zhuhui Qjao Jianbin Zhang Jun Yang Weimin Liu State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Qingdao Center of Resource Chemistry and New Materials Qingdao 266000China School of Public Health Qingdao UniversityQingdao266000China

High entropy alloy(HEA)has attracted great interests as one of the promising multifunctional materials in marine ***,Cu as an effective biocide tends to form segregation in HEA,which could deteriorate corrosion and induce brittle ***,we report a strategy to tailor the existing form of Cu in HEA from undesired large-scale segregation to uniform distribution with dispersed nanoscale precipitation,while retaining the unique structure characteristics of *** Cu segregation improves toughness and avoids serious corrosion in the grain *** distribution with dispersed nanoscale precipitation of Cu further enhances the antifouling and lubricating abilities of Cu-doped *** AlCoCrFeNiCu_(0.5)HEA in this work has excellent comprehensive properties combining good mechanical properties,outstanding antifouling abilities,superior resistance to corrosion and ***,the corresponded mechanisms are discussed in terms of Cu-segregation-eliminated,nanoscale-Cu-precipitate-forming and comprehensive properties.

关键词： High entropy alloys Copper nanoscale precipitate Comprehensive properties Ocean

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