English is a little trouble for me .so ,there are maybe some errors in
my writting.
so I hope someone who is kind help me check the syntax error (grammar
mistakes)
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Different microstructures and mechanical properties can be developed
in a variety of annealing temperature. An investigation was undertaken
to examine effect of annealing temperature on microstructure and
mechanical of dual phase steel under simulated hot-dipped galvanizing.
The steel (of composition 0.15wt%C 0.1wt%Si 1.7wt%Mn) was obtained at
three different heating temperatures (790$B!n(B, 820$B!n(B, 850$B!n(B) by continuous
annealing experiment thermal simulator. The microstructures were
observed by the optical microscope and transmission electron
microscopy, and the mechanical properties were tested. Under hot-dip
galvanizing condition, the effect of annealing temperature on
microstructure and the relationship of microstructure and mechanical
properties have been investigated. Increasing the annealing
temperature, martensite volume fraction increases, and intergranular
carbide reduces and ferrite intragranular carbide becomes small. When
the annealing temperature is 790$B!n(B, most of martensite distributes
intergranular region. Increasing the annealing temperature,
intragranular island martensite increases. When the annealing
temperature reaches 820$B!n!$(Btwin martensite appears in the room
temperature microstructure. The influence of annealing temperature on
the flow curve is significant. When the annealing temperature is 790$B!n(B,
there is obvious yield point elongation. When the annealing
temperature is 820$B!n(B, yield point elongation disappears. At the same
time, tensile strength fluctuates with the annealing temperature
changes.