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Investigation on Strengthening Mechanism of China Low-Activation Ferrite Steel upon Thermo-Mechanical Treatment

Acta Metallurgica Sinica(English Letters) 2024年第2期37卷 373-387页

作者： Dongtian Yang liangyin xiong Hongbin Liao Guoping Yang Xiaoyu Wang Shi Liu Institute of Metal Research Chinese Academy of SciencesShenyang110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang110016China Center for Fusion Science Southwestern Institute of PhysicsChengdu610041China

The objective of this study was to investigate the influence of strengthening mechanisms on the high-temperature mechanical properties of China low-activation ferrite(CLF-1)steel,which underwent thermodynamic design and thermo-mechanical treatment(TMT).The microstructure characterization in the normalized and tempered condition and the TMT condition was carried out using optical microscopy,X-ray diffractometer,and scanning electron microscopy with electron backscatter ***-resolution transmission electron microscopy was employed to determine the crystallographic structures of precipitated *** results indicated that the addition of Ti led to an increase in the allocation of C in MC phase and an enhancement in the content of MC *** to CLF-P steel in the normalized and tempered condition,a 1.5-fold increase in dislocation density and an order of magnitude improvement in MX phase density were achieved after *** formation of high-density nano-scale MC phases during TMT played a significant role in precipitation strengthening due to their favorable coherent relationship with the matrix and low interfacial free *** excellent high-temperature mechanical properties observed in CLF-P steel after TMT can be attributed to the combined effects of precipitation strengthening,dislocation strengthening,and lath strengthening.

关键词： China low-activation ferrite(CLF-1)steel Thermo-mechanical treatment MC phase Crystallographic structure Strengthening mechanism

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Rapid Hydrogen Transportation Along Grain Boundary in Nickel

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Acta Metallurgica Sinica(English Letters) 2014年第4期27卷 615-620页

作者： Yongli Wang liangyin xiong Shi Liu Department of Special Environment Materials Institute of Metal ResearchChinese Academy of Sciences

The permeability and diffusivity of hydrogen in directionally solidified polycrystalline and single crystal nickel foils were measured by gas permeation *** results showed that both hydrogen diffusivity and permeability were higher in directionally solidified nickel specimen than those in single crystal one at the temperature ranging from 300 to480 °C,and confirmed the existence of short-circuit diffusion along the grain boundaries（GBs） in the directionally solidified *** results suggested that the rapid diffusion along GBs was more obviously characterized in terms of higher permeability rather than higher *** contribution of grain boundary to hydrogen transportation was represented by the differences of diffusivity（and permeability） in single crystal nickel and directionally solidified *** modifying the Fick＇s first diffusion law and counting the grain boundary density,the hydrogen diffusivity and permeability of rapid diffusion along GBs were *** results suggested both the diffusivity and permeability fit the Arrhenius relationship well at different temperature.

关键词： Hydrogen trapping Hydrogen embrittlement Grain boundary diffusion Nickel

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Formation Mechanism of Nanoparticles in Fe-Cr-Al ODS Alloy Fabricated by Direct Oxidation Method

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Acta Metallurgica Sinica(English Letters) 2021年第7期34卷 963-972页

作者： Fuzhao Yan Jing Li Yiyi Li liangyin xiong Shi Liu Materials for Special Environments Division CAS Key Laboratory of Nuclear Materials and Safety AssessmentShi-changxu Innovation Center for Advanced MaterialsInstitute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China

This study presents the fabrication of 14CrFe-Cr-Al oxide dispersion strengthened(ODS)alloy by a direct oxidation *** order to explain how oxide nanoparticles are formed in the consolidation process,the powders after oxidation are subjected to vacuum thermal treatment at high *** scanning calorimeter,X-ray photoelectron spectroscopy,scanning electron microscopy and transmission electron microscopy techniques are used to detect the generation,evolution of oxides on both the surface and interior of the powder,as well as the type of oxide nanoparticles in the fabricated ODS *** is found that an iron oxide layer is formed on the surface of the powder during low temperature *** the iron oxide layer would be decomposed after thermal treatment at high *** the consolidation process,the oxygen required by the reaction of alumina and yttrium oxide to produce nano scale Y-Al-O particles mainly derives from the decomposition of iron oxide layer at elevated temperature and the inward diffusion of *** the direct oxidation process,YAlO_(3) nanoparticles are dispersed in the grains and at the grain boundaries of Fe-Cr-Al ODS alloy.

关键词： Fe-Cr-Al ODS alloy Direct oxidation Iron oxide layer Y-Al-O nanoparticles Formation mechanism

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Preliminary study on the fabrication of 14Cr-ODS FeCrAl alloy by powder forging

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Journal of Materials Science & Technology 2021年第24期83卷 49-57页

作者： Sajian Wu Jing Li Changji Li Yiyi Li liangyin xiong Shi Liu CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Technical Support Division Shenyang National Laboratory for Materials ScienceInstitute of Metal ResearchChinese Academy of SciencesShenyang 110016China

A simple powder forging process was presented herein to fabricate an Fe-14 Cr-4.5 Al-2 W-0.4 Ti-0.5 Y_(2)O_(3)ODS Fe Cr Al *** forged alloy exhibits a high density that exceeds 97%of the theoretical *** ODS alloy was investigated in terms of the residual porosity,morphology and phase structure of oxide nanoparticles,impact toughness and tensile *** was found that refined grains were obtained during powder forging.A residual porosity less than 1.1%has no impact on the precipitation of oxide *** average diameter of the oxide particles is 7.99 nm,with a number density of 2.75×10^(22)m^(-3).Almost all of the oxides are identified as orthorhombic YAl O3 *** refined grains and uniformly distributed oxide nanoparticles enable the alloy to show excellent mechanical strength and ductility below 700℃,and enable the ductile-to-brittle transition temperature to be close to room ***,a slight decrease in strength at 1000℃and the Charpy upper shelf energy has been suggested to be due to the residual *** results indicate that powder forging can be used as a promising technique for the fabrication of ODS alloys.

关键词： ODS FeCrAl alloy Powder forging Porosity Oxide nanoparticle Mechanical properties

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Effect of Silicon and Aluminum Addition on Corrosion Behavior of ODS Iron-Based Alloys in Liquid Lead–Bismuth Eutectic

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Acta Metallurgica Sinica(English Letters) 2023年第5期36卷 732-744页

作者： Jing Li Xiaochen Zhang Haibin Ma liangyin xiong Shi Liu Qisen Ren Zhengzheng Pang Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang110016China Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang110016China Nuclear Fuel and Materials Department China Nuclear Power Technology Research InstituteShenzhen518026China

The long-term corrosion behaviors of four variants of oxide dispersion strengthened(ODS)iron-based alloys in the stagnant oxygen-saturated lead–bismuth eutectic(LBE)at 550℃ were studied *** effects of silicon and aluminum content on the thickness,morphology and composition of the oxide scale were explored with the aid of X-ray diffraction(XRD),scanning electron microscopy(SEM),electron probe micro-analyzer(EPMA)and X-ray photoelectron spectroscopy(XPS).The addition of 1.5 wt%silicon is not able to contribute to forming a protective external silicon oxide film on the surface of aluminum-free ODS iron-based alloy,while the addition of aluminum promotes the formation of a thin and continuous alumina oxide *** the meantime,an appropriate amount of silicon becomes the heterogeneous nucleation site for alumina during the initial stage of oxidation,giving rise to the rapid formation of a protective alumina ***,excessive silicon has a negative impact on the formation of continuous alumina scale,because it may compete with aluminum to absorb more *** result of oxidation kinetics in ODS iron-based alloy shows that the parabolic rate constant of the alumina oxide scale is 3–4 orders of magnitude lower than that of the scale mainly composed of iron and chromium oxide.

关键词： Pb-Bi corrosion Oxide dispersion strengthened(ODS)ferritic alloy Silicon and aluminum addition Oxide scale

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Preparation and sintering of nanometer W-2 wt.% Y_2O_3 composite powders

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Journal of Rare Earths 2015年第7期33卷 752-757页

作者：李长记刘实熊良银王文涛 Department of Materials for Special Environment Institute of Metal Research Chinese Academy of Sciences

W-2 wt.%Y2O3 composite material with uniform distribution of yttrium element was fabricated through processes of mechanical alloying （MA） and spark plasma sintering （SPS）. The relevant productions were characterized by scanning electron microscopy （SEM）, energy dispersive spectroscopy （EDS）, X-ray diffraction （XRD）, and transmission electron microscopy （TEM）. The XRD showed that the W-2 wt.%Y2O3 composite powder, including tungsten matrix and Y2O3 particles, was refined to nanometer sizes during the MA process. The SEM and TEM micrographs showed that the MA produced composite powder presented a lamellar morphology and contained many dislocations and microcracks. The EDS showed that the Y and O elements were uniformly distributed in the W matrix after mechanically alloying for 15 h. The W-2 wt.%Y2O3 composite material with uniform distribution of yttrium was obtained by sintering of the MA produced composite powder.

关键词： W-2 wt.%Y2O3 composite material lamellar nanometer powder uniform distribution of Y MA SPS rare earths

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射频反应溅射制备MgO二次电子发射薄膜

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金属学报 2016年第1期52卷 10-16页

作者：王彬熊良银刘实中国科学院金属研究所沈阳110016 中国科学院金属研究所核用材料与安全评价重点实验室沈阳110016

采用氧化激活AgMg合金在表面形成MgO薄膜,以及采用射频反应溅射沉积法在不锈钢基片上分别制备了MgO薄膜和掺杂CoO的MgO薄膜,研究了制备工艺对薄膜二次电子发射系数及耐电子束轰击能力的影响.结果表明,薄膜厚度对其耐电子束轰击能力有显... 详细信息

采用氧化激活AgMg合金在表面形成MgO薄膜,以及采用射频反应溅射沉积法在不锈钢基片上分别制备了MgO薄膜和掺杂CoO的MgO薄膜,研究了制备工艺对薄膜二次电子发射系数及耐电子束轰击能力的影响.结果表明,薄膜厚度对其耐电子束轰击能力有显著影响,随着薄膜厚度的增加,耐电子束轰击能力明显增强,而射频反应溅射沉积可通过调整镀膜时间获得不同厚度的MgO薄膜.射频反应溅射的氧分压比对MgO薄膜表面质量有较大影响,随着沉积过程中氧分压比增大,MgO薄膜表面粗糙度增大,不利于二次电子发射.CoO掺杂改善了MgO薄膜表面质量,使其表面更加平整、光滑,提高了薄膜的二次电子发射系数,而且降低了薄膜表面质量对氧分压比变化的敏感性.550℃真空热处理1h使CoO掺杂的MgO薄膜发生热分解失氧且表面质量变差,导致二次电子发射系数大幅下降.在沉积过程中,提升基片温度或提高氧分压,会使薄膜中存在金属态Mg且薄膜表面质量变差,使二次电子发射系数小幅下降.

关键词：射频反应溅射沉积薄膜厚度表面粗糙度二次电子发射系数耐电子束轰击能力

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退火温度对镍基ODS合金组织结构的影响

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稀有金属材料与工程 2023年第12期52卷 4141-4146页

作者：王彬毛哲刘实熊良银滨州学院机电工程学院山东滨州256600 中国科学院金属研究所中国科学院核用材料与安全评价重点实验室辽宁沈阳110016

对冷变形后镍基ODS合金进行不同温度的退火,通过TEM、XRD和EBSD分析了合金的微观组织结构,探究了退火工艺对冷变形后镍基ODS合金微观组织结构的影响。结果表明:随着退火温度的升高,镍基ODS合金的位错密度降低,少量纳米氧化物颗粒发生粗... 详细信息

对冷变形后镍基ODS合金进行不同温度的退火,通过TEM、XRD和EBSD分析了合金的微观组织结构,探究了退火工艺对冷变形后镍基ODS合金微观组织结构的影响。结果表明:随着退火温度的升高,镍基ODS合金的位错密度降低,少量纳米氧化物颗粒发生粗化;冷变形态合金经过900℃退火后,组织均匀且纳米氧化物颗粒未发生明显长大;通过计算,确认了900℃退火后镍基ODS合金拉伸性能的主要贡献者为位错强化和弥散强化,为合金性能的提升提供了理论支撑和有效手段。

关键词：镍基ODS合金氧化物颗粒位错密度弥散强化退火温度

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中间热处理对Zr-1Nb-0.2Y合金在420℃空气中氧化性能的影响

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金属学报 2016年第1期52卷 85-92页

作者：李长记熊良银刘实中国科学院金属研究所沈阳110016 中国科学院金属研究所核用材料与安全评价重点实验室沈阳110016

研究了中间热处理工艺对Zr-1Nb-0.2Y(质量数,%)合金在420℃空气中氧化性能的影响.结果表明,通过变形及适当的多道次退火,可以有效控制合金化元素的析出,最终获得合理组织与最佳性能.随轧制及热处理道次加深,合金的抗氧化性能逐渐提高,... 详细信息

研究了中间热处理工艺对Zr-1Nb-0.2Y(质量数,%)合金在420℃空气中氧化性能的影响.结果表明,通过变形及适当的多道次退火,可以有效控制合金化元素的析出,最终获得合理组织与最佳性能.随轧制及热处理道次加深,合金的抗氧化性能逐渐提高,由中间退火工艺为640℃,3 h+570℃,3 h得到的最终样品具有最优的抗氧化性能.合金的位错密度对氧化性能的影响并不显著.TEM形貌观察以及沉淀相EDS分析表明,中间热处理工艺通过影响沉淀相的体积分数、平均尺寸、合金化元素Nb+Y含量(平均含量与总含量)等因素来影响Zr-1Nb-0.2Y合金的氧化性能.沉淀相的体积分数、尺寸和合金元素含量等因素通过协同作用共同影响Zr-1Nb-0.2Y合金的氧化性能.

关键词： Zr-1Nb-0.2Y合金中间热处理氧化性能沉淀相

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Nb-Ti-Ni合金的显微组织与氢渗透性能

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金属学报 2008年第7期44卷 781-785页

作者：熊良银刘实王隆保戎利建中国科学院金属研究所沈阳110016

研究了Nb50Ti25Ni25及Nb40Ti30Ni30合金的显微组织及氲渗透性能,并与贵金属Pd、Pd-Ag合金及纯Nb的氢渗透性能进行了比较.两种合金的显微组织均由先析出的bcc-Nb(Ti,Ni)固溶体和bcc-Nb(Ti,Ni)+B2-TiNi共晶组成.随Ni、Ti合金元素含量增加... 详细信息

研究了Nb50Ti25Ni25及Nb40Ti30Ni30合金的显微组织及氲渗透性能,并与贵金属Pd、Pd-Ag合金及纯Nb的氢渗透性能进行了比较.两种合金的显微组织均由先析出的bcc-Nb(Ti,Ni)固溶体和bcc-Nb(Ti,Ni)+B2-TiNi共晶组成.随Ni、Ti合金元素含量增加,合金中共晶相的含量增加.氢渗透温度为673K时,两种合金的氢渗透系数分别为1.71×10^(-8)和1.03×10^(-8)mol·m^(-1)·s^(-1)·Pa^(-0.5),接近Pd的氢渗透系数,略低于Pd-Ag合金的氢渗透系数.共晶相的比例增加有利于提高合金的抗氢脆性能,增加先析出相的比例可提高合金的氢渗透系数.适当调整合金元素含量可获得综合性能良好的氢渗透合金.

关键词： Nb-Ti—Ni合金氢渗透系数氢脆

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