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利用Gleeble 3800热模拟试验机,结合膨胀仪研究了微量铜和砷对连续加热过程和冷却过程中Ti-IF钢相变动力学的影响;结合光学显微镜和扫描电子显微镜,模拟研究了微量铜和砷对不同热轧终轧温度条件下TiIF钢的铁素体晶粒尺寸的影响。结果表明:与几乎不含铜和砷的Ti-IF钢相比,铜、砷的质量分数为0.08%、0.04%的Ti-IF钢中的铜和砷显著提高连续加热过程中Ti-IF钢奥氏体相变的开始温度和连续冷却过程中铁素体相变的结束温度。这主要是由于砷是封闭铁基奥氏体区的元素。由于微量砷提高铁素体相变的结束温度,导致铁素体晶粒尺寸反常粗大。因此,对于残余砷含量较高的Ti-IF钢,应适当控制较高的热轧终轧温度,以避免形成粗大的铁素体组织。
The effects of trace amounts of copper and arsenic on the phase transformation kinetics of Ti-IF steel during continuous heating and cooling were investigated by using Gleeble 3800 thermal simulator and dilatometer. Combining optical microscope and scanning electron microscope, the effects of trace amounts of copper and arsenic Effect of TiIF steel ferrite grain size under different hot rolling finishing temperature conditions. The results show that the content of copper and arsenic is 0.08% compared with that of Ti-IF steel, which contains almost no copper and arsenic. The contents of copper and arsenic in 0.04% Ti-IF steel significantly increase the Ti-IF steel The onset temperature of austenite transformation and the end temperature of ferrite transformation during continuous cooling. This is mainly due to the fact that arsenic is an element that seals the iron-based austenite region. As trace arsenic increases the end temperature of ferrite transformation, resulting in ferrite grain size abnormal coarse. Therefore, for Ti-IF steels with a high residual arsenic content, the higher hot rolling finishing temperature should be properly controlled to avoid the formation of coarse ferrite structures.