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Abstract:
12 Processes with
various controlled-rolling, controlled-cooling and coiling temperatures
have been designed. The behavior of Nb (C,N) precipitation, dislocation
density, sub grain state, texture, ferrite grain size and pealite
fraction have been examined experimentally. Each strengthening effect
has been calculated and the interaction between them have been
analysised, as a result of which it can be concluded that fine grain
strengthening is the most important strengthening mechanism and subgrain
strengthening, texture strengthening and pealite strengthening can be
neglected under the condition finished in austenite range, and there are
heavy interactions between precipitation and dislocation strengthening.
A new yield strength evaluation formula for controlling rolled
micrealloyed steels finished in austenite range has been built.
Key words:
屈服强度 估算 微合金钢
Received
198907, received in revised form 199008
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