摘要
探讨了不同合金元素的双相钢（Ｆ＋Ｍ）经不同时效工艺处理后铁素体精细结构、显微组织变化及其对力学性能的影响。结果表明：双相钢低温时效（≤７０℃）后铁素体的显微硬度时效曲线有硬度峰，这是由于铁素体中淬火空位迁移，并且聚集成位错圈，构成点阵障碍。这种点阵缺陷阻碍了可动位错的滑移，造成了摩擦硬化。宏观力学性能上表现为硬度升高，σ＿ｂ、σ＿ｓ上升。
The fine structure and its effect on mechanical properties of ferrite are studiedin some low carbon dual-phase stells containing Cr,Mn,Al and Si elements after differentaging processes respectively.The results show that there exists a ferrite microhardness peakin aging curves when samples are aged at low temperature(≤70℃).This phenomenon isdue to the migration of quenching vacancies and condensation to form dislocation loops inthe ferrite,which results in the formation of lattice defect,based on the TEM observation.This lattice defect may hinder the movable dislocation from slipping and result in frictionhardening and consequently , the σ_b and σ_s are increased greatly.
基金
上海市科委青年基金资助
