该文以耒阳电厂２００ＭＷ机组锅炉过热器爆管试样及原始管材试样为研究对象，采用Ｘ射线衍射仪进行了点阵参数分析，探讨了过热器爆管前后点阵参数的变化，结果表明：点阵参数随着材料中合金元素含量的增加而变大；爆口处的点阵参数小于原始状态和背火面处的点阵参数。表３参２ In this paper, the boiler superheater tube explosion samples and the original pipe samples of the 200MW unit in Shenyang Power Plant were taken as the research object. The lattice parameters were analyzed by X-ray diffractometer. The changes of lattice parameters before and after superheater tube explosion were discussed. The results show that the lattice parameters become larger with the increase of alloying elements in the material. The lattice parameters at the bursts are smaller than the original ones and the lattice parameters at the backfire surface. Table 3 reference 2