钒微合金钢的高温力学性能分析

针对V微合金化高强异型钢在轧制过程中易出现翼缘裂边的情况，采用Gleeble 3800热模拟试验机对V质量分数为0.060%～0.080%的连铸坯试样在应变速率为1×10^-3 s^-1的试验条件下进行了700~950 ℃高温拉伸试验。通过对高温拉伸试样断口形貌、断面收缩率、抗拉强度及应力-应变曲线等的分析，得出试验钢的第III脆性温度区为750~875 ℃，不同变形温度下应力-应变曲线均表现为动态回复，并且随着变形温度的升高，曲线向下向左移动，最大应力对应的应变逐渐降低。因此，连铸生产时应优化配水模型，连铸坯入矫直机温度为900～950 ℃，以保证铸坯良好的表面质量。

Analysis of high temperature mechanical properties of vanadium microalloyed steel

Aiming at the flange crack of vanadium micro-alloyed high strength profiled steel during rolling,high temperature tensile tests of continuous casting billet with 0.060%-0.080% vanadium were carried out at 700-950 ℃ using Gleeble 3800 thermal simulator at 1×10-3 s-1 strain rate.The analysis of fracture morphology,section shrinkage,tensile strength and stress strain curve at high temperature show that the third brittle temperature zone of test steel is 750-875 ℃,the stress strain curves show dynamic recovery at different deformation temperatures,and the curve moves downward to the left with the increase of deformation temperature in which the strain corresponding to the maximum stress decreases gradually.Therefore the water distribution model should be optimized in the continuous casting production and the slab straightening start temperature should be controlled in 900-950 ℃ to ensure good surface quality of casting billet.