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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(Pf).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.

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