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Magnetic Properties and Oxygen Content of Nanocrystaline FeCuNbSiB Alloy Annealed in Hydrogen and Air

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Journal of iron and steel research International 1997年第1期4卷 33-36页

作者： Chen Wenzhicentral iron and steel {3. institute, MMI, beijing (1.0081., china Ctrl. iron and Stl. Res. institute MMI lieijing 100081 China

Soft magnetic properties and distribution of oxygen are investigated for the nanocrystalline Fe 73.5 Cu 1Nb 3.i 13.5 B 9 alloy annealed in hydrogen and air respectively by means of magnetic measurements, X ray diffraction, Auger energy spectra and X ray photoelectron analysis. The oxygen content at the surface of the strips can be as high as 3. at.% after air annealing. The oxygen is concentrated mainly in the surface layer up to 3. nm in form of Fe 2O 3.and SiO 2. Excellent magnetic properties can still be reached (except for initial permeability μ o) by air annealing. The optimum temperature for the air annealing decreases by 40 ℃ than that of hydrogen annealing.

关键词： nanocrystalline alloy annealing magnetic property oxygen

APPLICATION research ON THE Ni _3.Al INTERMETALLIC COMPOUND IN CISRI

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Acta Metallurgica Sinica(English Letters) 1995年第Z1期8卷 503-508页

作者： FENG Di YE Wujun HAN Guangwei LUO Heli(central iron steel {3. institute, beijing 10008 1 , china) central iron steel {3. Inst Beijing China

research work and recent progress made toward the industrial applications of the Ni_3.l in CISRI are discussed in present paper. The development of a Ni_3.l base alloy named MX-246 hardened by carbides and fine dispersion of disordered γ is summaried. This alloy,with higher peak temperature of yield strength and higher strain hardening rate than alloyIC-218,has been successfully used as the material of rolling guider at elevated temperatures and in wear conditions. The Ni3.l base alloy of GH264 has been made into welding electrodes by horizontal continuous casting process, and recently successfully surfacing welded on hydraulic blades as cavitation erosion resistance material. The process of remelting Ni3.l base alloy in air was also developed. The processes of producing welding electrodes and remelting in air set the base of industrial applications of Ni3.l in welding, repairing and casting in mass production and into components of large size. Another application of the compound, manufacturing the jet engine rivets used at about 13.0℃ , can be attributed to its excellent oxidation resistance and still keeping high strength up to the melting point.

关键词： Ni_3.l intermetallic compound,surfacing welding cavitation oxidation Resistance

Bonding and Fracture Characteristics at α_2/γ Interface in TiAl Alloy with B Addition

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Journal of Materials Science & Technology 1999年第1期15卷 43-47页

作者： Senying LIU Dongliang ZHAO Rongze HU and Chongyu WANG(central iron and steel {3. institute, beijing 1.0081. china)Ping LUO(National {3. Center for CRM, beijing 100013. china) central iron and steel {3. institute Beijing 100081 China National research Center for CRM Beijing 100013 China

The bonding characteristics of (0001)α2||(111)γ interface in two-phase TiAl alloy have beeninvestigated with the recursion method. The results of bond order integral and interaction energybetween atoms are presented. The effects of B on atoms bonding both in constituent phase andat the α2/γ interface have been studied. The correlation between the mechanical propertiesof the alloy and the bonding at the interface has been discussed. The results suggest that Bsegregation to the interface benefits the ductility. This is supported by the related experiment.

关键词： TiAl Bonding and Fracture Characteristics at Interface in TiAl Alloy with B Addition

LAMELLAR MICROSTRUCTURE IN DUPLEX Ti-Al-V INTERMETALLIC COMPOUND

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Acta Metallurgica Sinica(English Letters) 1992年第4期5卷 282-285页

作者： GAO Ying ZHU Jing CAI Qigong central iron and steel {3. institute,Ministry of Metallurgical Industry,beijing,china central iron and steel {3. Inst Beijing China

The morphology and crystallographic orientation of(α_2+γ)lamellar structure in duplex Ti-47.5Al-2.5V intermetallic compound have been studied by means of TEM, microdiffraction as well as 180° and non-180° rotation twinning analysis.A possible atomic model of the interface was ***,approach was made to a mechanism on complex nucleation of α_2+γ two phases along α-Ti interface,and growth of α_2/γ/γ_1/α_2 or α_2/γ/α_2/γ as fundamental structural unit.

关键词： TiAl intermetallic compound lamellar structure rotation twinning analysis interface

Low cycle fatigue behavior of high strength gun steels

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Journal of University of Science and Technology beijing 2004年第3期11卷 268-272页

作者： Maoqiu Wang Han Dong Qi Wang Changgang Fan Division of Structural Materials, central iron & steel {3. institute, beijing 1.0081. china Div. of Structural Mat. Central Iron and Steel Res. Inst. Beijing 100081 China

The low cycle fatigue (LCF) behavior of two high strength steels, withnominal chemical compositions (mass fraction, %) of 0.40C-1.5Cr-3.i-0.4Mo-0.2V (PCrNi3.oV) and0.25C-3.r-3.o-0.8Ni-0.1Nb (25Cr3.o3.iNb), was investigated by using the smooth bar specimenssubjected to strained-controlled push-pull loading. It is found that both steels show cyclicsoftening, but 25Cr3.o3.iNb steel has a lower tendency to cyclic softening. 25Cr3.o3.iNb steel hashigher fatigue ductility, and its transition fatigue life is almost three times that of PCrNi3.oV.25Cr3.o3.iNb steel also shows higher LCF life either at a given total strain amplitude above 0.5% orat any given plastic strain amplitude, despite its lower monotonic tensile strength than that ofPCrNi3.oV. It also means that 25Cr3.o3.iNb steel can endure higher total strain amplitude andplastic strain amplitude at a given number of reversals to failure within 10~4. 25Cr3.o3.iNb steelis expected to be a good gun steel with high LCF properties because only several thousand firingsare required for gun barrel in most cases.

关键词： high strength steel low cycle fatigue mechanical property

THERMODYNAMICS　OF　Cu-Y-M(M=Al,Si,Ti,Fe)LIQUID　SOLUTIONS

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中国有色金属学会会刊：英文版 1994年第4期4卷 16-19页

作者： Du,Ting Li, Guodong(central iron and steel {3. institute, beijing 1.0081.

ＴＨＥＲＭＯＤＹＮＡＭＩＣＳＯＦＣｕ－Ｙ－Ｍ（Ｍ＝Ａｌ，Ｓｉ，Ｔｉ，Ｆｅ）ＬＩＱＵＩＤＳＯＬＵＴＩＯＮＳ￥Ｄｕ，Ｔｉｎｇ；Ｌｉ，Ｇｕｏｄｏｎｇ（ＣｅｎｔｒａｌＩｒｏｎａｎｄＳｔｅｅｌＲｅｓｅａｒｃｈＩｎｓｔｉｔｕｔｅ... 详细信息

ＴＨＥＲＭＯＤＹＮＡＭＩＣＳＯＦＣｕ－Ｙ－Ｍ（Ｍ＝Ａｌ，Ｓｉ，Ｔｉ，Ｆｅ）ＬＩＱＵＩＤＳＯＬＵＴＩＯＮＳ￥Ｄｕ，Ｔｉｎｇ；Ｌｉ，Ｇｕｏｄｏｎｇ（ＣｅｎｔｒａｌＩｒｏｎａｎｄＳｔｅｅｌＲｅｓｅａｒｃｈＩｎｓｔｉｔｕｔｅ，Ｂｅｉｊｉｎｇ１０００８１）Ａｂ...

关键词： iso-activity interaction coefficient Cu-Y-M(M=Al, Si, Ti, Fe)

Effect of Zirconium on Tensile Property,Microstructure and Fracture Behaviour of Cast Ni_(3.Al Based Alloy

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Journal of iron and steel research International 1997年第1期4卷 37-41页

作者： Ye Wujun, Feng Di, Han Guangwei, Luo Heli central iron and steel {3. institute, MMI, beijing (1.0081., china Ctrl. iron and Stl. Res. institute MMI Beijing 100081 China

The effect of Zr on tensile property, microstructure and fracture behaviour of cast Ni 3.l based alloy strengthened with carbides has been studied. It was found that Zr distributes at interdendrites and grain boundaries in the form of ZrC particle and Ni 5Zr eutectic phase which can refine microstructure. Ni 5Zr phase can alleviate the crack initiation at grain boundaries and dendrite boundaries, which helps deformation to be harmonical between matrix and precipitates at elevated temperature.

关键词： Ni 3.l alloy tensile property fracture behaviour microstructure

Surface Adsorption of Si_3._4 Ultrafine Powder at Room Temperature

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Journal of iron and steel research International 1997年第1期4卷 52-55页

作者： Ai Xingtao, Chen Minghaocentral iron and steel {3. institute, MMI, beijing (1.0081., china Ctrl. iron and Stl. Res. institute MMI Beijing 100081 China

In this paper, Pyrolysis Gas Chromatography Mass Spectroscopy is adopted to measure heating release curve of Si 3. 4 ultrafine powder at different temperatures. The results demonstrate that Si 3. 4 mainly adsorbs O 2, N 2, CO 2, NH 3.and H 2O during the storage at room temperature, of which O 2 and N 2 are physisorped and H 2O chemisorped. Hydrolysis reaction is the reason for oxygen increasement and the different states of oxygen can be determined by improved heat extraction. The mechanisms of the reaction speed as well as the formation of different states of oxygen are also discussed.

关键词： Si 3. 4 ultrafine powder adsorption hydrolysis

Magnetocrystalline Anisotropies of RFe_(10)V_2 (R=Y, Tb, Dy, Ho, and Er) and Their Hydrides

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Journal of Materials Science & Technology 1998年第5期14卷 447-450页

作者： Weiren ZHAO Jueyun PING and Ruzhang MA (Material Physics Dept., University of Science and Technology beijing, beijing 100083. china)(Present address: {3. iron & steel research institute,beijing 1.0081. china) Material Physics Dept. University of Science and Technology Beijing Beijing 100083 China central iron and steel {3. institute Beijing 100081 China

The magnetocrystalline anisotropies of RFe10V2 (R=Y, Tb, Dy, Ho and Er) and their hydrides were studied by X-ray diffraction, magnetization and a.c. susceptibility measurements. The uniaxial anisotropy of Fe-sublattice and R-sublattice with positive second order Stevens αJ in RFe10V2 compounds is weakened by hydrogenation, while that of R-sublattice with negative αJ (Er) enhanced. Such a change of anisotropy causes planar-easy magnetic structures in RFe10V2 (R=Tb and Dy) at room temperature and induces spin reorientation in HoFe10V2 after hydrogenation. The change of anisotropy of R-sublattice after hydrogenation may be owed to a decrease of the second order crystalline coefficient.

关键词： Ho and Er and Their Hydrides V2 R=Y Dy Magnetocrystalline Anisotropies of RFe