论文部分内容阅读
通过Gleeble—1500D热模拟机研究了不含Nb元素和含Nb元素耐候钢的连续冷却转变(CCT)曲线,分析了Nb元素及冷却速度对耐候钢CCT曲线及组织变化规律的影响。结果表明,Nb元素的加入阻碍了耐候钢相变的发生,降低了各相开始转变的温度,导致相变曲线向右下移动;当冷却速度为15℃/s时,加入Nb元素的耐候钢组织发生明显的变化;含Nb耐候钢随着冷却速度的增大,其硬度逐渐提高,当冷却速度大于5℃/s时,有大量的贝氏体生成,当冷却速度大于20℃/s时,有部分马氏体生成,均有利于提高耐候钢的强度,改善其性能。
The continuous cooling transformation (CCT) curves of Nb-free and Nb-containing weathering steels were studied by Gleeble-1500D thermal simulator. The effects of Nb content and cooling rate on the CCT curves and microstructure of weathering steels were analyzed. The results show that the addition of Nb interferes with the occurrence of weathering steel phase transformation and decreases the temperature at which each phase begins to change, causing the phase transition curve to move to the right. When the cooling rate is 15 ℃ / s, The hardness of Nb-containing weathering steels increases with the cooling rate increasing. When the cooling rate is more than 5 ℃ / s, a large amount of bainite is formed. When the cooling rate is more than 20 ℃ / s , Some martensite generated, are conducive to improving the strength of weathering steel to improve its performance.