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利用金属薄膜透射电镜观察,电子衍射分析和X-射线能谱分析等方法,确定以38Fe-40Ni-14Cr为基的高温合金,经过750℃和800℃长达5000小时时效处理后组织的变化,发现:(1)合金中γ’-相聚集长大的倾向性缓慢;(2)晶内普遍析出针状Laves-相和微量的μ-相;(3)晶界上除了M_3B_2和M_(23)C_6外,还有块状的σ-相析出,晶界上析出σ-相使合金脆化,从而使合金的室温冲击值急剧下降。
The microstructures of 38Fe-40Ni-14Cr-based superalloy were determined by transmission electron microscopy (TEM), electron diffraction (XRD) and energy dispersive X-ray spectroscopy (XRD) The results show that: (1) the tendency of the γ’-phase to aggregate and grow is slow in the alloy; (2) acicular Laves-phase and trace μ- phase are precipitated in the crystal; (3) besides the M_3B_2 and M_ (23) ) C_6, there are massive σ-phase precipitation, grain boundary precipitation σ-phase alloy embrittlement, so that the alloy at room temperature impact value dropped sharply.