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选择２２５Ｃｒ─１Ｍｏ钢手工电弧多层焊焊接头进行了不同工艺规范的持久强度试验，用透射电镜对蠕变断裂时母材和焊缝碳化物的形态、大小和分布进行了分析，采用选区电子衍射和ＥＤＡＸ能谱分析方法对析出的碳化物类型进行了鉴定．结果表明，试验中出现的碳化物类型分别为Ｆｅ３Ｃ，Ｍｏ２Ｃ和Ｍ２３Ｃ６．在试验时间较长应力较小时，断裂试样中针状Ｍｏ２Ｃ在晶内聚集粗化，块状Ｍ２３Ｃ６在晶界聚集粗化，这种碳化物分布状态是影响蠕变断裂的主要因素．
Select 225Cr - 1Mo steel arc welding manual multi-arc welding of different specifications of the long-term strength test, transmission electron microscopy of creep rupture of the parent material and weld carbide morphology, size and distribution were analyzed by the selection of electronic The types of precipitated carbides were identified by diffraction and EDAX EDS. The results show that the types of carbides appearing in the experiment are Fe3C, Mo2C and M23C6, respectively. When the stress of longer test time is smaller, the acicular Mo2C aggregates and coarsens in the fracture specimen, and the massive M23C6 aggregates and coarsens in the grain boundary. The distribution of these carbides is the main factor that affects the creep rupture.