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通过Gleeble-1500D热模拟试验机研究了不同Cr含量的低碳高铌X80管线钢在相同变形工艺条件下的软化行为,采用补偿法计算了试验钢的静态再结晶百分率,分析了变形温度和道次间隔时间对静态软化行为的影响。结果表明:变形温度在900～980℃,Cr含量达到一定水平时,可以通过溶质拖曳作用显著降低奥氏体再结晶的进行;Cr的加入还可以增加NbC的固溶度、减小其析出驱动力而延迟其析出时间。
The softening behavior of low carbon and high niobium X80 pipeline steel with different Cr content under the same deformation process conditions was studied by Gleeble-1500D thermal simulation test machine. The static recrystallization percentage of the test steel was calculated by the compensation method. The deformation temperature, The Effect of Interval on Static Softening Behavior. The results show that the austenite recrystallization can be significantly reduced by the solute drag when the deformation temperature is 900 ~ 980 ℃ and the Cr content reaches a certain level. The addition of Cr can also increase the solid solubility of NbC and reduce its precipitation drive Force and delay its precipitation time.