用电镜观察、电解提取相分离、X射线衍射和电子探针分析的综合方法研究了6Cr4Mo3Ni2WV钢的碳化物相。在1120℃淬火时,钢中未溶碳化物中存在有碳原子长程有序的M_2C和碳原子空位短程有序的V_4C_3。观察到回火析出时V_4C_3与M_2C的伴生成核。确定了合金元素在钢基体和碳化物之间的分配。
The carbides in 6Cr4Mo3Ni2WV steel have been studied by TEM, electrolytic extraction phase analysis, X-ray diffraction and EMPA. It was confirmed that the M_2C with long-range ordered carbon distribution and V_4C_3 with short-range ordered vacancy distribution are present in the residual carbides of the steel quenched from 1120℃. The nucleation of V_4C_3 with concomitant M_2C was observed during the tempering precipitation.The distribution of alloying elements partitioned between steel matrix and carbides is thus ascertained.
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