非调质钢的强度为α-Fe基体细化强度与固溶强化、奥氏体析出碳化物弥散强化、 界面强化和过饱和铁素体析出碳化物的析出强化的强度增量之和. 以细晶铁素体强度 为基础, 利用相最强键上的共用电子数nA及相界面电子密度差Δρ 计算了连铸连轧非调质钢固溶强化、界面强化、弥散强化和析出强化 的强度增量. 给出了一组计算非调质钢连铸连轧终轧强度的公式. 可 根据化学成分和工艺规定的终轧晶粒尺寸计算终轧强度, 或根据技术 要求的强度给出相应的轧制晶粒尺寸与化学成分间的最佳组合. 实现了化学成分-轧制晶粒尺寸-终轧强度的计算机预报.
The strength of non quenched-tempered steel consists of the strength of fine-grained α-Fe matrix, solution-strengthening, interface-strengthening, dispersion-strengthening (carbides from austenite), and separation-strengthening (carbides from oversaturated ferrite). Based on the strength of α-Fe matrix, the strengthening increments of the above four mechanisms are respectively calculated with the electron number nA on the strongest bond in alloying phase and electron density difference Δρ on biphase interface. A set of strength calculated equations is proposed with the strengthening factors and the weights of C and alloying elements (M) in non quenched-tempered steel, and used in calculation of the end-rolled strength of non quenched-tempered on the basis of composition and the grain size after rolling. In opposition, the optimization between composition and the grain size can be accomplished on the strength proposed by technical standard. So, the end-colled strength prediction from composition, and grain size can be carried out.
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