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Search Results: 1 - 10 of 4667 matches for " Shanghai Iron Steel Research Institute "
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STRUCTURAL RELAXATION AS THE ORIGIN OF MAGNETIC PERMEABILITY DECAY IN AMORPHOUS ALLOY Fe_(76)Si_(10)B_(14)

ZHANG Yanzhong Shanghai Iron,Steel Research Institute,

金属学报 , 1985,
Abstract:
THREE NEW Fe-BASED MICROCRYSTALLINE ALLOYS WITH SUPERIOR MAGNETIC PROPERTIES
ZHANG Yanzhong,NIAN Suzhen Shanghai Iron,Steel Research Institute,
ZHANG Yanzhong
,NIAN Suzhen Shanghai Iron and Steel Research Institute

金属学报(英文版) , 1992,
Abstract: Three new Fe-based microcrystalline alloys,i.e.,Fe_(73.1)Cu_(1.2)Nb_(3.2)Si_(12 5)B_(10),Fe_(73)Cu_1Nb_(1.5)Mo_2Si_(12.5)B_(10) and Fe_(73)Cu_1Zr_3C_(0.5)Mo_Si_(12.5)B_(10),were developed with su-perior magnetic properties.e.g.,high relative initial permeability of μ_i~15×10~4,lowcoercivity of H_c1.0A/m,high effective permeability and low core losses in a consid-crable wide frequency range and high pulse-magnetic permeability under narrow pulse.The optimum value of relative effective permeability,μ_5~1 is 16×10~4 under condition off=1 kHz and H_m=0.4 A/m.The optimum values of core loss reach 57.9 30.2 and 68W/kg under condition of f=50.100.100 KHz and B_m=0.5,0.2,0.3 T,respectively.These three alloys have superior stability of magnetic properties.Initial permeabilitymay be not changed during heating at 130℃ up to 216 h.The main crystalline phaseis ordered phase Fe_((75)+y)Si_((25)-y) which is ultrafine particles of average size 10—20 nm.
SECONDARY HARDENING OF BAINITE IN HIGH SPEED STEEL
高速钢中贝氏体的二次硬化特征

YU Xuejie,ZHOU Tianjian Shanghai Iron,Steel Research Institute Anhui Institute of Technology,Hefei YU Xuejie,Shanghai Iron,Steel Research Institute,Wusong,Shanghai,
俞学节
,周天健

金属学报 , 1989,
Abstract: The mechanical properties and structure of bainite and martensite af-ter tempered in 6-5-4-2 high speed steel have been investigated. It was found thatthe secondary hardening effect and resistance to heat softening as well as impacttoughness are higher in the bainite than in the martensite. TEM observations showthat the Fe_3C precipitated in the martensite after temrering at the temperaturenear the peak of hardening-tempering temperature curve. However, no Fe_3C but thedispersive MC and M_2C precipitated in the ferrite and austenite of bainite aftertempering at the same temperature. This shows the diffusion of alloy elements form-ing carbide must be taken during the process of bainite growing.
SECONDARY HARDENING OF BAINITE IN HIGH SPEED STEEL
YU Xuejie Shanghai Iron,Steel Research Institute,Shanghai,China ZHOU Tianjian Anhui Institute of Technology,Hefei,China YU Xuejie Senior Engineer,Shanghai Iron,Steel Research Institute,Taihe Road,Wusong,Shanghai,China,
YU Xuejie Shanghai Iron and Steel Research Institute
,Shanghai,China ZHOU Tianjian Anhui Institute of Technology,Hefei,China YU Xuejie Senior Engineer,Shanghai Iron and Steel Research Institute,Taihe Road,Wusong,Shanghai,China

金属学报(英文版) , 1990,
Abstract: The mechanical properties and structure of bainite and martensite after tempering m 6-5-4-2 high speed steel have been investigated.It was found that the secondary hardening effect and resistance to heat softening as well as impact toughness are higher in the bainite than in the martensite.TEM observations show that the(Fe,M)_3C precipitated in the martensite after tempering at temperature near the peak of hardness-tempering temperature curve.However, no(Fe,M)_3C but the dispersive MC and M_2C precipitated in the ferrite and austenite of bainite after tempering at the same temperature.This indicates that the diffusion of alloy ele- ments forming carbide might exist during the process of bainite growing.
EVALUATION OF PERMEABILITY STABILITY OF SEVERAL AMORPHOUS FERROMAGNETIC ALLOYS
几种非晶态铁磁合金的磁导率稳定性的估计

ZHANG Yanzhong Shanghai Iron,Steel Research Institute ZHANG Yanzhong senior engineer,Steel Research Institute,Shanghai Measuring,Testing Centre,Shanghai Iron and,
张延忠

金属学报 , 1989,
Abstract: 本文根据非晶态铁磁合金的磁导率衰减动力学的实验数据得到的经验公式,利用平均激活能和频率因子的实验值估计了预退火的非晶合金Fe_(76)Si_(10)B_(14),Fe_(40)Ni_(38)Mo_4B_(18)和(Fe_(0.1)Ni_(0.35)Co_(0.55))_(78)Si_8B_(14)的起始磁导率的相对稳定程度。计算结果表明,虽然不能实质上消除磁导率的不稳定性,但是大约在不超过100℃的温度范围内,磁导率相对稳定程度对实际应用是足够的。换句话说,在相当长时间内,磁导率衰减相当小。
Surface Structure and High-frequency Magnetic Properties of the Amorphous [Co_(0.94-x)Fe_(0.06)(MoMn)_x]_(77)(SiB)_(23) Alloys
Lijun CHEN Yuzhi LIU Gingzhen XU Haisheng SHI Shanghai Iron,Steel Research Institute,Shanghai,China,

材料科学技术学报 , 1993,
Abstract: The relationship between the high-frequency magnetic properties and surface structure of the amorphousCo_(0.94-x)Fe_(0.06)(MnMo)_x]_(77)(SiB)_(23) alloys annealed at 400-500℃ then control-cooled was investigated usingXRD,TEM and XPS techniques.The results have shown that the high-frequency losses of the present alloys ob-viously reduced after suitable treatment.A crystalline layer with ultrafine grains of γ-Co formed on the surface ofthe amorphous ribbons.The size of the grains is 10-20 nm.The thickness of the layer is less than 0.1 μm.The sur-face of the crystalline layer is covered with an extremely thin oxide film which is very uniform and dense withthickness of less than 30 nm,the size of grains of the oxide is less than 10 nm.These ultrafine grains and thedense oxide film effectively refine the magnetic domains and increase the resistance of the layers of the magneticcore,consequently the losses at high frequency are fairly reduced.
MAGNETIC PROPERTIES OF NEW NANOCRYSTALLINEFe_(71.5)(CuCrV)_(7.5)Si_(12)B_9 SOFT MAGNETIC ALLOY
新纳米晶软磁合金Fe71.5(CuCrV)7.5Si12B9的磁性能

ZHANG Yanzhong Shanghai Iron,Steel Research Institute,Shanghai,
张延忠

金属学报 , 1993,
Abstract: 本文报道新发展的不含Nb的Fe71.5(CuCrV)7.5Si12B9纳米晶软磁合金的综合磁性能。直流起始磁导率μi=10.9×10^4;矫顽力Hc=0.56A/m;对应Hm=80A/m的B80=1.04T;对应Hm=0.08A/m和f=0.1和1MHz的有效磁导率μe=2.5×10^4和0.4×10^4;铁损P2/100k=195kW/m^3;P2/200k=664kW/m^3;P2/500k=
UNUSUAL SOLIDIFICATION MICROSTRUCTURE OF Fe_(70)Cr_(18)Mo_2Si_1B_9 SINGLE-ROLL QUENCHED RIBBON
LIN Yijian YOU Yunlong ZHANG Xiaomin JING Chunyong YU Quanqin Shanghai Iron,Steel Research Institute,Shanghai,China LIN Yijian Shanghai Iron,Steel Research Institute,Shanghai,China,
LIN Yijian YOU Yunlong ZHANG Xiaomin JING Chunyong YU Quanqin Shanghai Iron and Steel Research Institute
,Shanghai,China LIN Yijian Shanghai Iron and Steel Research Institute,Shanghai,China

金属学报(英文版) , 1989,
Abstract: The solidification microstructure of Fe_(70)Cr_(18)Mo_2Si_1B_9 single-roll quenched ribbons with dif-ferent rotating speed of roller and under different atmosphere conditions was investigated.Apart from usual crystallization by homogeneous and heterogeneous nucleation,it was foundthat α-iron cohnnnar grains with strong preferred orientation formed beneath free surface andthat spheres of α-iron single coastal with a size of several μm up to 20μm,which have rarelybeen reported,appeared inside the ribbons.There was experirnental evidence suggesting thatclusters of metal atoms formed from fluctuation in early undercooled liquid might play a roleas pre-existed nuclei and,in fact,control the formation of amorphous for this alloy.
CHANGE OF BORIDE IN Fe_(70)Cr_(18)Mo_2SiB_9 WITH THERMAL TREATMENT
LIN Yijian HU Jian YOU Yunlong JING Chunyong YU Quanqin Shanghai Iron,Steel Research Institute,Shanghai,China LIN Yijian Measuring,Testing Centre,Shanghai Iron,Steel Research Institute,Shanghai,China,
LIN Yijian HU Jian YOU Yunlong JING Chunyong YU Quanqin Shanghai Iron and Steel Research Institute
,Shanghai,China LIN Yijian Measuring and Testing Centre,Shanghai Iron and Steel Research Institute,Shanghai,China

金属学报(英文版) , 1990,
Abstract: The formation of borides M_3B_2 M_2B_2 and M_(23)B_6 may be carried out from the melt-quenchedFe_(70)Cr_(18)Mo_2SiB_9 during 700—1150℃ annealing.As the temperature raising,the M_2B,themajority being Fe_2B.may be gradually replaced by Cr_2B via the co-existence between Fe_2Band Cr_2B.The Cr_2B may be formed by trans formation of Fe_2B through the atomic substitu-tion and structural adjustment.The thin slice of remaining Fe_2B is sandwiched between(100)faces of(Cr,Fe)_2B as stacking fault.The M_2B_2 is virtually composed of theMo_(1+x)(Fe,Cr)_(2-x)B_2 where x(0≤x≤1)increases with the increase of temperature.
EVALUATION OF PERMEABILITY STABILITY OF SEVERAL AMORPHOUS FERROMAGNETIC ALLOYS
ZHANG Yanzhong Shanghai Iron,Steel Research Institute,Shanghai,China ZHANG Yanzhong Senior Engineer,Measuring,Testing Centre,Shanghai Iron,Steel Research Institute,Shanghai,China,
ZHANG Yanzhong Shanghai Iron and Steel Research Institute
,Shanghai,China ZHANG Yanzhong Senior Engineer,Measuring and Testing Centre,Shanghai Iron and Steel Research Institute,Shanghai,China

金属学报(英文版) , 1990,
Abstract: The evaluation of the relative stability of initial permeability has been made of the pre-an-nealed amorphous ferromagnetic alloys Fe_(76)Si_(10)B_(14),Fe_(40)Ni_(38)Mo_4B_(18) and(Fe_(0.1)Ni_(0.35)Co_(0.55))_78Si_8B_(14) by the experimental values of average activation energy and fre-quency factors on the basis of the empirical expression deduced by experimental data of thekinetics of their permeability decay.Calculated results show that the relative stability ofpermeability is sufficient for practical uses in the temperature range within 100℃,althoughthe permeability instability can not be substantially eliminated.In other words,thepermeability decay is considerably small within a period of considerable length.
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