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Search Results: 1 - 10 of 170864 matches for " YU Xuejie WANG Jianlin Shanghai Iron and Steel Research Institute "
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PRECIPITATION OF TiC IN METASTABLE β-Ti ALLOY
YU Xuejie WANG Jianlin Shanghai Iron and Steel Research Institute,Shanghai,ChinaZHOU Tianjian Anhui Institute of Technology,Hefei,China YU Xuejie,Senior Engineer,Shanghai Iron Steel Research Institute,Taihe Road,Wusong,Shanghai,China.
金属学报(英文版) , 1989,
Abstract: In order to clarify that the IFP and the “Type 2”α phase are also arising from TiC,ametastable β-Ti alloy was selected for investigation in this work.The results showed that af-ter heating the alloy just below the α+β→β transus temperature and quenching,the TiC lay-er existed at the α/β interface.The morphology of TiC is similar to that of the IFP arisingfrom TiH_2 in the α-β two-phase alloys.The IFP TiC also provided an easy crack path orthe crack initiation sites.The fracture is also identical to that caused by IFP TiH_2.The arceddiffractions(characteristic of “Type 2”α)were found in the selected area diffraction pat-terns of some specimens which had been isothermally aged after solid solution treatment.Theparticles which bring on the arced diffractions may be TiC on the basis of structure and lat-tice parameter analysis,not the so called “Type 2”α phase.
HYSTERESIS OF PHASE TRANSFORMATION TEMPERATURE IN NiTi SHAPE MEMORY ALLOY
QIN Guiying YU Xuejie JIN Heng WANG Jingcheng Shanghai Iron,Steel Research Institute,Shanghai,China,
QIN Guiying YU Xuejie JIN Heng WANG Jingcheng Shanghai Iron and Steel Research Institute
,Shanghai,China

金属学报(英文版) , 1992,
Abstract: The relationship between structure and hysteresis of phase transformation temperature in NiTi shape memory alloy has been investigated by means of TEM observation,positron an- nihilation and electrical resistivity measurement.The sequence of hysteresis for the alloy aged under different regimes was found to be:plate martensite>R-phase>tie-like martensite. The reversible displaeement of phase boundaries of these transformations is blocked by the co- herent stress field around Ti_(11)Ni_(14)phase particles.A linear relationship between S paramet- er of positron annihilation and maximum values of temperature hysteresis showed that the mismatch dislocation and elastic stress field established by Ti_(11)Ni_(14)phase precipitation are the main factor to determine the temperature hysteresis of phase transformation in NiTi shape memory alloy.
HYSTERESIS OF PHASE TRANSFORMATION TEMPERATURE IN NiTi SHAPE MEMORY ALLOY
NiTi形状记忆合金的相变温度滞后

QIN Guiying,YU Xuejie,JIN Heng,WANG Jingcheng Shanghai Iron,Steel Research Institute,
秦桂英
,俞学节,金恒,王景成

金属学报 , 1992,
Abstract: The relationship between structure and hysteresis of phase transformation tem-perature in NiTi shape memory alloy has been investigated by means of TEM observation, positron annihilation and electrical resistivity measurement. The sequence of hysteresis for the alloy aged under different regimes was found to be: plate martensite > R phase > tie--like martensite. The reversible displacement of phase boundaries of these transformations is blocked by the coherent stress field around Ti_(11)Ni_(14) phase particles. A linear relationship between Sparameter of positron annihilation and maximum values of temperature hysteresis showed that the mismatch dislocation and elastic stress field established by Ti_(11)Ni_(14) phase precipitation arethe main factor to determine the temperature hysteresis of phase transformation in NiTi shape memory alloy.
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.
Coercivity Mechanism of Melt-spun Nd-Fe-B Bonded Magnet
HUANG Gangxiang XU Qingzhen GAO Huimin YU Shanfu HUA Hongci WANG Geya Shanghai Iron,Steel Research Institute,Shanghai,China,
黄钢祥
,徐庆镇,高惠民,余善富,华宏慈,王葛亚

材料科学技术学报 , 1990,
Abstract: The microstructures of melt-spun Nd_135- Fe_81.74B4.76 ribbons have been investigated by means of X-ray diffraction,Mossbauer spectroscopy and HREM.Experimental results show that optimal magnetic properties of the bond- ed magnet can be obtained by melt-spun alloys at wheel velocity of 24m/s,the microstructure of which was single phase Nd_2Fe_(14)B crystallites,and no other phases,such as Nd-rich,B-rich or x-Fe phase,were present.It is considered that the high intrinsic coercivity ~iH_c can be attributed to the sin- gle-domain behaviour of Nd_2Fe_(14)B crystallite phase.
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.
EFFECT OF γ-IRRADIATION ON CuZnAl SHAPE MEMORY ALLOY
ZHANG Guilin XU Feng LIU Wenhong YU Fanghua Shanghai Institute of Nuclear Research,Academia Sinica,Shanghai,ChinaWANG Jingcheng SHAO Zichang Shanghai Iron and Steel Research Institute,Shanghai,China
金属学报(英文版) , 1992,
Abstract: Effect of γ-irradiation on the shape memory alloy CuZnAl has been studied by the techniquesof TEM,positron annihilation etc..The martensitic transformation temperature of the alloyincreases obviously ofter γ-irradiation at a dose of 2×10~7 Gy but not for a dose of 1×10~7 Gy.The shape memory effect in both irradiated alloys remains unaffected.
AN EXPERT SYSTEM FOR COMPUTER AIDED ALLOY STEEL DESIGN—ASPRES
CHEN Yu,CHEN Nianyi Shanghai institute of Metallurgy,Academia Sinica,Shanghai,China PENG Ping,KONG Bingyu Iron and Steel Research Institute,Shanghai Baoshan Iron and Steel Complex,Shanghai,China professor,Shanghai Institute of Metallurgy,Academia Sinica,Shanghai,China
金属学报(英文版) , 1993,
Abstract: An alloy steel pattern recognition expert system,ASPRES,has been established for thepurpose of computer aided optimal design of alloy steel in compositions and process pa-rameters,Pattern recognition techniques are used to abstract inner relationship betweenmechanical properties and process variables.The ASPRES uses 2-dimensional graph asvisual knowledge to represent domain expertise of specific object.Forward and back-ward chaining can be utilized by researcher in predicting sample performances or givinghelpful suggestions about the chemical compositions and process parameters accordingto desired properties.
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