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Nb-Mo-V微合金钢固溶后在450 ~ 650℃温度下回火不同时间,利用透射电镜(TEM)和三维原子探针(3DAP)对不同温度回火硬度峰值样品的显微组织及碳化物进行分析.结果表明:回火温度越高,样品硬度达到峰值所需的回火时间越短;析出强化效果最佳时合金碳化物的等效半径约1.0 nm,数量密度约2.0×1024 m-3;450℃样品中碳化物是以Nb4C3为核心,在渗碳体中原位形核而成,合金元素与碳原子配比接近4:3;500 ~ 650℃样品中碳化物的合金元素和碳原子形成团簇、偏聚分布在基体中,并未形成独立晶体结构和稳定元素化学计量配比.

参考文献

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