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采用两相区变形-保温-淬火(DIQ)热处理工艺,研究低碳钢两相区变形位错增殖作用下Mn元素配分行为及其对贝氏体组织的影响规律。通过OM、SEM、TEM、EPMA和XRD等手段对组织成分、位错密度、合金元素分布等进行表征。结果表明,变形后的铁素体晶粒和马氏体板条细化、块状马氏体数量减少;位错密度由0.36×10~(14)m~(-2)增加至1.20×10~(14)m~(-2),位错滑移的相互运动提高了空位浓度及间隙溶质原子数量,加速了C、Mn元素在a相与g相中的扩散速率,促进了Mn在两相区的配分效果,C、Mn元素富集量及富集区域增多。采用两相区变形-保温-奥氏体化-淬火-贝氏体区保温-淬火(DI&Q&PB)热处理工艺,残余奥氏体的体积分数由11.5%提高到13.9%,残余奥氏体中的C含量由1.14%提高到1.28%。
The heat treatment process of two-phase zone deformation-holding-quenching (DIQ) was used to study the effect of Mn on the biodistribution of bauxite under the action of deformation dislocation in the two-phase region of low carbon steel. The microstructure, dislocation density and alloying elements were characterized by OM, SEM, TEM, EPMA and XRD. The results show that the deformed ferrite grain and martensite strip refine and the amount of massive martensite decreases; the dislocation density increases from 0.36 × 10 ~ (14) m ~ (-2) to 1.20 × 10 ~ (14) m ~ (-2), the interaction of dislocation slip increases the vacancy concentration and interstitial solute atoms, accelerates the diffusion rate of C and Mn in phase a and phase g, Phase partition effect, C, Mn enrichment and enrichment area increased. The volume fraction of retained austenite increased from 11.5% to 13.9% by using DI & Q & PB heat treatment in a two-phase zone. The volume fraction of retained austenite in C The content increased from 1.14% to 1.28%.