J.W. Zhao
,
H. Ding
,
W.J.Zhao
,
F.R. Cao
,
H.L. Hou
,
Z.Q. Li
金属学报(英文版)
A cellular automaton (CA) model is established to
simulate dynamic recrystallization (DRX) in the $\beta$ single-phase
field of Ti6Al4V alloy, and the kinetics during DRX processing has
been analyzed. The model employed considers the influences of
dynamic recovery, nucleation rate, strain rate and dislocation
density on DRX, and practical deformation parameters, such as
temperature, strain and strain rate on DRX have been considered in
the simulation. The simulated DRX grain size and DRX grain shape
agree well with the experimental results, which shows the
availability and feasibility of the cellular automaton method for
the simulation of DRX. The result of kinetics analysis of DRX
reveals that the Avrami exponent is variable ranging from 2.4 to
2.9, which increases with the increase of strain rate.
关键词:
Ti6Al4V alloy
,
null
,
null
,
null
,
null
,
null
X.Y.Le
,
S.Yan
,
W.J.Zhao
金属学报(英文版)
The surface defect distribution in stainless steel irradiated with intense pulsed ion beam(IPIB) of current density above 60A/cm2 and acceleration voltage 300-500keV wasdiscussed and analyzed. The defects near the surface of stainless steel were generatedin two ways: (1) generated by the bombardment of energetic ions and (2) induced bythe high level stress near the surface. Thus the temperature and stress distributionsnear the steel surface were calculated by means of our STEIPIB code, which treatedwith the thermal-dynamical process in the target irradiated by the IPIB. Based onthese distributions, the generations and movements of these defects were discussedand compared with the experiment results.
关键词:
IPIB
,
null
,
null
