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复膜金相法是电力施工建设、修造、运行单位对于不能破坏的工件,如发电厂锅炉的联箱、集汽箱、主蒸汽及再热蒸汽管道、导汽管及上述部件的焊缝、弯头、连接件等进行金相检验的一种简便方法。电力系统曾在五十年代末六十年代初使用过,但随着大型工件金相显微检查仪的出现以及复膜金相法存在的问题,如胶膜太薄,易于褶绉变形,不宜在光学显微镜上观察和照相,此法逐渐不再使用。近几年来,我们用有机玻璃和丙酮、有机玻璃和三氯甲烷在金相试样上进行了复膜试验。由于有机玻璃溶于三氯甲烷比溶于丙酮快,便用有机玻璃和三氯甲烷进行了各种试验,用复膜和实际试样在试验室进行了比较,最近又将复膜金相用于现场不能破坏的部件的金相检验和分析,并用暗色有机玻璃和采用染色复膜解决了金相组织的复膜反差小的缺点,效果较好。
Fumo metallographic method is the construction of electric construction, construction, operation unit for the unbreakable parts, such as power plant boiler header, steam box, main steam and reheat steam pipe, steam pipe and the above components of the weld, elbow , Connectors and other metallographic examination of a simple method. The power system was used in the late 1950s and early 1960s. However, with the advent of large-scale metallographic microscopy and the problems of the metallographic method, such as too thin films and easy pleat deformation, it is not advisable to use optical microscopy Observation and photography, this method is no longer used. In recent years, we use plexiglass and acetone, plexiglass and chloroform in the metallographic samples on the film test. Since plexiglass is soluble in chloroform faster than acetone, various tests are conducted with plexiglass and chloroform, with the laminating film being compared to the actual specimen in the laboratory, and recently the laminating phase On the scene can not be damaged parts of the metallographic examination and analysis, and the use of dark plexiglass and the use of dyed complex film to solve the shortcomings of the metallographic microstructure contrast, the effect is better.