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本文借助于透射电镜和电子衍射分析手段,研究了15CrMoV钢在拘束多层焊条件下,各焊层近缝区粒状贝氏体精细结构与韧性的对应关系。研究结果表明:随着焊层数增大,(M—A)组织的精细结构发生本质性的变化,由高碳的孪晶马氏体向低碳的位错马氏体转化;铁素体基体的精细结构,由单纯的高密度位错特征逐渐转化到其上再弥散分布着极细的V_4C_3析出相。与此相对应,该近缝区随着焊层数增大韧性依次提高。
In this paper, by means of transmission electron microscopy and electron diffraction analysis, the relationship between the fine structure of bainite and the toughness of 15CrMoV steel under the confined multi-layer welding was studied. The results show that the fine structure of (M-A) microstructure changes with the increase of the number of welding layers, from high-carbon twinned martensite to low-carbon dislocation martensite. Ferrite The fine structure of the matrix gradually transformed from simple high-density dislocation features to finely dispersed V_4C_3 precipitates. Correspondingly, the near-seam area increases as the number of layers increases and the toughness increases in turn.