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Effect of Compressive Deformation on Lenticular and Thin Plate Martensitic Transformations

ZHA NG Xiumu QI Yan ZHONG Jiaxiang GUO Yunyi ** Institute of Metal Research , Academia Sinica , Shenyang , 110015 , China.Beijing University of Science and Technology , Beijing , 100081 , China. To whom correspondence should be addressed.

材料科学技术（英文）

The effect of compressive deformation tested above the M_s temperature on the martensite morphology in Fe-Ni-C alloys has been studied.In the Fe-30Ni-0.12C alloy,the M_s temperature is -50℃ The cylindrical specimens were compressively deformed at -40℃.The strain rates were 10,20,30 and 40%.X-ray analysis and metallographic examination showed that no strain-induced martensite was found.After quench- ing to -53℃,some thin plates and unusual morphologies of lenticular martensites with bent and/or broken mid-ribs were observed.In the Fe-30Ni-0.34C alloy,the M_s temperature is -120℃.Compressive deformation with different strain rates were carried out at room temperature. After quenching to the liquid nitrogen temperature, some bent thin plate matensites(unbroken)occur- red.The transformed twins in bent plate were also bent and nearly parallel to the γ-α'interfaces. Orientation relationship between austenite and bent martensite has been examined by means of trans- mission electron microscope.It was proved that these unusual morphologies are inherent in the compressive pre-deformed austenite.

关键词: martensitic transformation , null , null , null

Effect of Tempered Martensite on Magnetomechanical Damping of Ferritic Matrix Dual Phase Alloys

Junsheng LU Xiaodong LIU Wenjie ZHENG Baorong WU Hui BI Central Iron and Steel Research Institute , Beijing , 100081 , ChinaGuijin WANG Dept.of Materials Science and Engineering , University of Pennsylvania , Philadelphia , PA 19104 , USA

材料科学技术（英文）

The influence of the volume fraction of tempered martensite on magnetomechanical damping of the ferritic matrix in dual-phase alloys was studied.The experimental results showed that(1) dual-phase damping alloy is of good combination of strength and toughness: (2)good damping ca- pacity(Q~(-1)≥5.0×10~(-3))can be obtained in dual-phase alloys only when the volume fraction of tempered martensite was controlled properly.The effect of martensite on magnetomechanical damp- ing of the ferritic matrix was analysed.The damping capacity of dual-phase alloys was related to the volume fraction V_m of tempered martensite by Q_~(-1)=Q_~(-1) (1-V_m/1+BV_m)at small vibration strain amplitudes ε_A≤5.0×10~(-6).

关键词: martensite , null , null

Relationship between Magnetomechanical Damping Capacity and Vibration Modes

Junsheng LU Baorong WU Dept.of Alloy Steel , Central Iron and Steel Research Institute Beijing , 100081 , ChinaG.J.Wang Dept.of Materials Science and Engineering , University of Pennsylvania , Philadelphia , PA 19104 , USA

材料科学技术（英文）

The mathematical expressions for magnetomechanical damping capacity are presented by applying Smith-Birchak's model in torsion pendulum and cantilever beam.The peak value ψ_p is found to be related to physical parameters and material constants in the form Kλ_s=αψ_pε_p.which can be used to estimate the magnetostrictive constant λ_s from the damping capacity-strain amplitude curve.A good agreement of experimental data and theoretical prediction was observed in HIDAMETS Cr15A13NiCu.

关键词: magnetomechanical damping , null , null , null

LEDGE STRUCTURE ON BROAD FACES OF FERRITE PLATES IN LOWER BAINITE

JIN Qiang FANG Hongsheng CAO Jianjun ZHENG Yankang CHEN Xiuyun Tsinghua University , Beijing , China Present adress: Central Iron and Steel Research Institute , Ministry of Metallurgical Industry , Beijing , 100081 , China

金属学报(英文版)

The ferrite/austenite interfacial structure in lower bainite has been studied in a hypereutectoid steel by means of electron microscopy.It is found that the mobile growth ledges and superledges and their three-dimensional morphologies exist on the broad faces of ferrite plates.Structural ledges were also observed on the broad faces of lower bainite.Based on TEM observations,the viewpoint that the growth ledges can also evolve from structural ledges is proposed.These observations provide evidences to the ledge growth mechanism of lower bainite.

关键词: bainitic ferrite , null , null , null

Low Energy Dislocation Structure in Deformed Metals

DIAO Xiaoxue XING Xiusan ** Department of Applied Physics , Beijing Institute of Science and Technology , Beijing , 100081 , China.To whom correspondence should be addressed.

材料科学技术（英文）

In this paper,the dislocation distribution struc- ture in deformed metal is discussed.The flow stress of material for the heterogeneous dislocation distri- bution which tends to the flow stress for the homo- geneous dislocation distribution in the limiting case is derived.The causes and the effects of the long range internal stresses are discussed.The total deformation energy of material system is obtained and the trend of evolution of dislocation distribu- tion in deformed metals is discussed simultaneously. No micromechanisms of dislocations are involved in the discussion,therefore the theory developed in this paper is universal.

关键词: Dislocation structure , null

Thermodynamic Behaviour of Fe-S-RE,Fe-Csat.-S-RE,Ni-S-RE,Cu-S-RE Solutions

Ting DU Longmei WANG Yeming WU Yuqing ZHANG Aisheng LIU Central Iron and Steel Research Institute , Beijing , 100081 , China

材料科学技术（英文）

The temperature dependences of the equilibrium constants for the reactions RES_((S))=[RE]+[S]. (RE=Ce,La,Nd,Sm,Y),of the standard Gibbs energies for the RES formed and of the interaction coefficients between RE elements and S for the Fe-base,Ni-base and Cu-base solutions are sum- marized.

关键词: thermodynamics , null , null , null , null