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INTRINSIC MAGNETISM AND MAGNETIC ANISOTROPY OF AMORPHOUS Fe_(1-x)(Si,B)_x ALLOYS

GUAN Kehong WANG Jun Northeast University of Technology , Shenyang , China GUAN Kehong , Associate Professor , Dept.of Material Science and Engineering , Northeast Univeristy of Technology , Shenyang 110006 , China

金属学报(英文版)

The magnetic moment and the magnetostriction decrease slightly with the increase of total Si+B content.A maximum of the Curie temperature appears at about 25 at.-% of Si+B.The magnetic anisotropy is uninfluential by the content of Si+B,but much influnce by the demagnetization effect of streak.A qualitative explanation of the experimental phenomenon seems to be noted by the aid of the electron transition and structure model of amorphous al- loys.

关键词: Fe-Si-B alloy , null , null , null , null , null

CHARACTER OF CARBON-DEPLETED REGIONS IN UNDERCOOLED AUSTENITE AND THERMODYANMICS OF BAINITIC TRANSFORMATION

YANG Quanmin KANG Mokuang Northwestern Polytechnical University , Xi'an , China YANG Quanmin , Dept.of Material Science and Engineering , Zhejiang University , Hangzhou 310027 , China

金属学报(英文版)

The chemical driving forces for the phase transformation from austenite in three different car- bon-depleted regions into ferrite with the identical composition have been derived respectively. The starting temperature of bainitic transformation,B_s,has also been calculated according to the shearing mechanism of bainitic transformation in carbon-depleted regions of austenite. The maximum driving forces for banitic transformation at B_s in both 3% Cr and the CrMo steels were obtained.It was shown that the proposed shearing mechanism of the bainitic trans- formation is thermodynamically possible.

关键词: bainitic , null , null

SOLIDIFICATION MICROSTRUCTURE OF Ni-BASE SUPERALLOY POWDER

HU Benfu LI Huiying WU Chengjian ZHANG Shouhua University of Science and Technology Beijing , Beijing , China Associate Professor , Dept.of Material Science and Engineering , University of Science and technology Beijing , Beijing 100083 , China.

金属学报(英文版)

The solidification microstructure and phase composition of Ni-base superalloy FGH95 pow- der with different mesh size have been investigated.The structure transition was found from dendrite in major into cellular structure as the powder size reduces and the cooling rate in- creases.The predominant phase was identified as MC-type carbide,with different morphologies,which may be related to their composition and the condition of solidification.Minor phases,such as boride,Laves and primary γ' are also present as ac- companiments of the carbide.

关键词: powder metallurgy , null , null , null

MIDRIB AND LEDGE OF BAINITE IN A Cu-Zn-Al-Mn ALLOY

HAN Ming CHEN Fumin CHEN Jinming CHEN Yuru LIU Wenxi Tianjin University , Tianjin , China CHEN Fumin Professor , Dept.of Material Science and Engineering , Tianjin University Tianjin 300072 , China

金属学报(英文版)

The bainitic transformation in a Cu-Zn-Al-Mn alloy has been examined with TEM.The re- sults show that the stacking faults and also the bainitic midrib are found at the beginning of bainite formation in the alloy.The stacking fault planes can pass continuously through the midrib in bainite.The growth ledges occur at the broad faces and rims of bainite.The broad and narrow faces of th ledges are parallel to the fault plane and habit plane respectively.Both their Miller indices are {110}_(B2).The moving direction of ledges is parallel to the fault plane. It may be deduced that the bainite in alloy are initially formed by shear and the process of growth are go verned by propagation o f fault planes.

关键词: Cu-Zn-AI-Mn alloy , null , null

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