Z. Li
,
G.Q. Zhang
,
Z.H. Zhang
,
S.F. Tian
金属学报(英文版)
In order to evaluate the deformation characteristics of spray formed superalloy GH742
and determine the appropriate forging procedure of the alloy on this basis, the influence
of deformation temperature and strain rate on the ductility of spray formed GH742
was investigated by using the Gleeble-3500 thermal-mechanical testing machine. It is
shown that the forgeability of spray formed GH742 is better than conventional GH742
by ingot metallurgy because of refined grain structure and enhanced chemical homo-geneity of spray formed GH742. In the temperature range of 1020 to 1100℃, the
ductility of spray formed GH742 is dependent on the deformation temperature and is
increased linearly in proportion to the increment of deformation temperature, which
is more than 40% at 1020℃ and more than 60% at the temperature between 1100
and 1140℃. Furthermore, the results indicate the flow stress is affected considerably
by the deformation temperature and strain rate. In the temperature range of 1020 to
1140℃, the maximum flow stress of spray formed GH742 increases with the increment
of strain rate and decreases with the increment of the deformation temperature.
关键词:
spray forming
,
null
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null
,
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Y.J. Ge
,
G.Q. Zhang
,
Y.M. Liu
金属学报(英文版)
The surface modification of nanometer carbon material has been studied by usingan Induced Dielectric Barrier Discharge Plasma device (IDBD). The experimentalresults show that with different work gases and different discharge conditions, thesurface behaviors of carbon black can be changed according to needs, including theuse of different functional groups and the change of the surface roughness of carbonparticles etc., which increased the grinding and dispersion abilities in binder.
关键词:
surface modification
,
null
,
null
,
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