用蠕变法在Gleeble-1500热模拟机上研究了不同Cu含量的Cu-Nb系超低碳钢的时效 过程. 结果表明, 在蠕变过程中, 沉淀析出使蠕变曲线出现平台, 平台的起点与结束 点分别对应析出开始点(Ps)与结束点(P f). 并得出了两类钢的沉淀析出等温转变(PTT)曲线. 由蠕变法测出的Pf与由硬度法测出的峰值 时间tp吻合得较好.
A creep test was conducted on a Gleeble-1500 thermal simulator for monitoring the aging procedure of Cu-Nb ultra-low carbon steels with different contents of copper. The result indicated that during creep testing the occurrence of precipitation could make a plateau on the creep curve. The left- and right-hand ending points of the plateau can be defined as the precipitation start (Ps) and finish (Pf) times, respectively. The Pf is in coincidence with the peak time (tp) from hardness curve. The precipitation-time-temperature (PTT) diagrams of two steels were obtained.
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