Q460C钢连续冷却转变规律研究
Study on Continuous Cooling Transformation Regularity of Q460C Steel
高 雅, 孙建林, 贠 冰
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作者单位：(北京科技大学 材料科学与工程学院, 北京 100083)
中文关键字：连续冷却转变曲线； Q460C钢； 膨胀法； 铌
英文关键字：continuous cooling transformation curve; Q460C steel; dilatometric test; Nb
中文摘要：利用热膨胀法并结合金相-硬度法在热膨胀仪和Gleeble-1500热模拟试验机上测定了Q460C钢的未变形和变形条件下的连续冷却转变曲线。测定了转变后组织的维氏硬度，随冷速的提高，组织硬度增大。两种CCT曲线上均有铁素体区(F)、珠光体区(P)、贝氏体区(B)和马氏体区(M)。变形使CCT曲线向左上方移动，提高了奥氏体冷却转变开始温度，随冷速加大提高得越多。变形扩大了F和P区，缩小了B和M区。与不含铌的16Mn钢的CCT曲线对比，分析了铌对连续冷却转变规律的影响。
英文摘要：The continuous cooling transformation curves of Q460C steel under un-deformed and deformed conditions were investigated on thermal dilatometer and Gleeble-1500 thermo-mechanical simulator based on dilatometric test, metallographic analysis and hardness measurement. The vickers-hardness of the microstructure after cooling was measured. The results show that the hardness increases with the increase of cooling rate. Ferrite(F) zone, pearlite(P) zone, bainite (B) zone and martensite(M) zone were found on both CCT diagrams. The deformation moves CCT curve to left and up direction. the cooling transformation initiating temperature of austenite increases more with the increase of cooling rate. The F and P zone enlarge and the B and M zone diminish. Compared with the CCT of 16MnR steel, the effect of Nb on the continuous cooling transformation regularity is analyzed.