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Abstract: A direct current flash butt welding (DC FBW) process is
analyzed for an ultra fine grain steel using finite element method.
According to the computed temperature field and the relation between
real welding time and Monte Carlo (MC) simulation time established from
the experimental data based (EBD) model, microstructure evolution model
is built up for the DC FBW. Then, the Austenite grain growth of the
welded joints for the ultra fine grain reinforcement steel bar is
simulated. At the same time the heat pinning effect of temperature
gradient on the grain growth in the heat affected zone is considered.
The results indicate that the grain size and distribution can be
predicted using the Monte Carlo simulation technology for the DC FBW
process. Also, the technology is a powerful tool for determining welding
parameters and improving welds quality.
Key words:
Ultra-fine
grain steel DC flash butt welding Monte Carlo simulation
Microstructure
CLC No: TG457
国家973资助项目(G1998061500). Received 20040222, received in revised form 20040809
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