ZHAO Xu
,
QI Min
,
YANG Dazhi Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
110015
,
China.Department of Materials Engineering
,
Dalian University of Technology
,
Dalian
,
116012
,
China.
材料科学技术（英）
The effect of α phase on CuZnAl shape memo- ry alloy(SMA)has been systematically studied by electrical resistance method,quantitative measure- ment of micrography and transmission electron microscopy(TEM).It is found that,by controlling the amount of α phase in(α+β)-CuZnAl alloy, phase transformation temperatures can be adjusted precisely in a wide range,while the good shape memory effect of CuZnAl is kept.In a word, quenching from(α+β)dual phase region is a rea- sonable method of adjusting phase transformation temperatures for CuZnAl alloy.
关键词:
(α+β)-CuZnAl alloy
,
null
,
null
YUAN Siyu
,
ZHANG Liwen
,
LIAO Shulun
,
QI Min
,
ZHEN Yu
,
GUO Shuqi
钢铁研究学报(英文版)
An FE model was developed to study thermal behavior during the rod and wire hot continuous rolling process. The FE code MSCMarc was used in the simulation using implicit static arithmetic. The whole rolling process of 30 passes was separated and simulated with several continuous 3D elasticplastic FE models. A rigid pushing body and a data transfer technique were introduced into this model. The online experiments were conducted on 304 stainless steel and GCr15 steel hot continuous rolling process to prove the results of simulation by implicit static FEM. The results show that the temperature results of finite element simulations are in good agreement with experiments, which indicate that the FE model developed in this study is effective and efficient.
关键词:
FE analysis;thermal behavior;hot continuous rolling;3D deformation
CHANG Ying
,
WANG Dapeng
,
LI Wei
,
PAN Wei
,
YU Xiaojun
,
QI Min
钢铁研究学报(英文版)
Rare earth permanent magnetic materials are typical electrical conductor, and their magnetic properties will decrease because of the eddy current effect, so it is difficult to keep them stable for a long enough time under a high frequency AC field. In the present study, as far as rare earth permanent magnets are concerned, for the first time, rare earth permanent magnets with strong electrical insulation and high magnetic performance have been obtained through experiments, and their properties are as follows: (1) Sm2TM17: Br=062 T, jHc=8037 kA/m, (BH)m=5897 kJ/m3, ρ=7 Ω·m; (2) NdFeB: Br=0485 T, jHc=76633 kA/m, (BH)m=3796 kJ/m3, ρ=9 Ω·m. The magnetic properties of Sm2TM17 and NdFeB are obviously higher than those of ferrite permanent magnet, and the electric insulating characteristics of Sm2TM17 and NdFeB applied have in fact been approximately the same as those of ferrite. Therefore, Sm2TM17 and NdFeB will possess the ability to take the place of ferrite under a certain high frequency AC electric field.
关键词:
Sm2TM17;NdFeB;electrical insulation;eddy current
