论文部分内容阅读
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。
The continuous cooling transformation curves of Q460C steel under undeformed and deformed conditions were measured by thermal expansion method and metallographic - hardness method on a dilatometer and Gleeble-1500 thermal simulation machine. The Vickers hardness of the transformed tissue was measured. As the cooling rate increased, the hardness of the tissue increased. Both CCT curves have ferrite (F), pearlite (P), bainite (B) and martensite (M). Deformation causes the CCT curve to move to the upper left, increasing the onset temperature of the austenite cooling transition, increasing as the cooling rate increases. Deformation expanded F and P area, narrowing B and M area. Compared with the CCT curve of 16Mn steel without niobium, the influence of niobium on the continuous cooling transformation was analyzed.