材料期刊网

本文研究了经亚温淬火获得的铁素体-马氏体双相20钢的组织性能关系以及冷轧时的形变行为。试验结果表明:双相钢中的铁素体与马氏体同单独存在时的组织性能有明显差异,通常用以估价纤维增强复合材料强度的混合律并不适用。双相20钢的冷轧形变由开始阶段的等应力模型逐渐向等应变比模型过渡,形变强化则由两相间的不等强化状态逐渐向等强度比状态演变。文中提出了冷轧时形变行为的综合图,能够清楚地描述双相20钢中两相组织及性能相对变化的全过程。

A study was made on the microstrueture, properties and deformation behaviour of intercritically quenched ferrite-martensite dual-phase steel 20 under coldrolling. The results indicate that both structure and properties of martensite and ferrite phases are quite different from those of single-phase ones. The conventional mixture law, which is commonly used to evaluate the strength of the fibre-reinforced composite materials seems to be not applicable. The model of deformation of the dual phase steel 20 in the process of cold rolling may be proposed by a gradual transition from stress-equal model at the starting to strain-ratio-equal model on the later stage. Its work-hardening may be attributed to a change from nonequal strengthening state to strength-ratio-equal state A summarized plot for its deformation behaviour during cold-rolling is also given to understand rather easily the relative variation of the structure and properties of each phase in the whole process.