Y.L. Liu
,
H. Yang
,
T. Gao
,
M. Zhan
,
W. Cai
金属学报(英文版)
The blade precision forging process is a forming process with high temperature and large plastic deformation. Interaction of deformation and heat conduction leads to large uneven distribution of temperature. The unevenness of temperature distribution has a great effect on mechanical properties and the microstructure of materials. So it is necessary to consider the influence of temperature on the precision forging process of blades. Taking a blade with a tenon into consideration, a 3D mechanical model in precision forging is built up. The distribution laws of temperature field and the influence of the temperature on the equivalent stress in the process are obtained by using 3-D coupled thermo-mechanical FEM code developed by the authors. The results obtained illustrate that the influence of the temperature field on the blade forging process is considerable. The achievements of predicting microstructure and mechanical properties for forged blades is significant.
关键词:
blade with a tenon
,
null
,
null
D. Chen
,
G.X. Li
,
D.L. Zhang
,
T. Gao
金属学报(英文版)
The equilibrium structures and electronic structure of LaNi 5-x Ga x (x=0, 0.5, 1.0) compounds have been investigated by all-electron calculations. Based on the full geometry optimization, the densities of states and electron densities of LaNi 5-x Ga x are plotted and analyzed. It is clear that the substitution of Ga at the Ni site leads to a progressive filling of the Ni-d bands, the ionic interaction between Ni and Ni, with Ga plays a dominant role in the stability of LaNi 5-x Ga x compounds. The smaller the shift of E F toward higher energy region, the more stable thecompounds will be. The increased contribution of the Ni-d-Ga-d interactions near E F and the low energy metal-gallium bonding bands indicate that the compounds become more stable. The results are compared with experimental data and discussed in light
of previous studies.
关键词:
FLAPW and GGA
,
null
,
null
,
null
