采用两种不同的轧制工艺, 对经过冷拔真应变为1.75的65Mn钢丝进行累积变形量为80.8%的三机架连续轧制变形制备扁钢丝, 分析了钢丝轧制前后力学性能和显微组织的演变。结果表明: 工艺2制备出了抗拉强度和显微硬度分别为2 328 MPa和532 HV的高强度扁钢丝; 钢丝中渗碳体片在轧制过程中可发生转动和弯曲变形制备扁钢丝, 并且不断碎化, 部分发生溶解; 末道次轧制后所获得的高强度取决于渗碳体部分溶解所引起的固溶强化效应和未溶渗碳体的弥散强化作用。

The as-drawn 65Mn steel wire with a true strain of 1.75 was rolled in two continuous rolling processes in three rolling-mills, and its total deformation degree was 80.8%. The mechanical property and the microstructure evolution of steel wire before and after rolling were analyzed. The results show that a high strength flat steel wire with a tensile strength of 2 328 MPa and a micro-hardness of 532 HV, was obtained in the process 2. The cementites in steel wire rotated, bending deformed, continuously fragmented and finally dissolved during the rolling process. The high strength of steel wire depended on partial solution of cementites which could cause solution strengthening and dispersion strengthening of undissolved cementites.