将Nb-V微合金钢在1200℃固溶0.5 h后淬火,在不同温度回火4 h,结合光学显微镜(OM)和透射电子显微镜(TEM),用三维原子探针(3DAP)研究了淬火与回火样品中碳化物的特征.结果显示,淬火样品中V,Nb分布均匀,C由于自回火出现轻微偏聚;450、500、550和600℃回火样品中存在大小和数量不同的V和Nb的碳化物,其中550℃回火样品中数量最高,对应着二次硬化的硬度峰值;650℃回火样品中数量明显减少,与硬度下降对应.
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