火灾现场中铜包钢导线熔痕金相鉴别技术研究
发布时间：2019-06-17 14:40
【摘要】：模拟火灾现场中铜包钢导线熔痕产生的条件,制备一、二次短路熔痕和火灾热作用导线痕迹。使用金相分析法,寻找最佳金相浸蚀剂,研究一、二次短路熔痕的金相组织特点。结果表明,4%硝酸酒精是最佳浸蚀剂,一次短路熔痕的组织以较细的马氏体为主,及少量暗色托氏体,存在气孔;二次短路熔痕中以马氏体为主,晶界处有铁素体析出,不存在托氏体,几乎没有气孔存在。
[Abstract]:The condition that the copper-clad steel wire of the copper-clad steel wire in the fire field is simulated is simulated, and a lead trace of a secondary short-circuit melting mark and a fire thermal effect is prepared. Metallographic analysis method is used to find the best metallographic etching agent, and the metallographic structure of the secondary short-circuit fusion mark is studied. The results show that 4% of the nitric acid alcohol is the best etching agent, the microstructure of the primary short-circuit melting mark is dominated by the fine martensite, and a small amount of dark troostite exists in the secondary short-circuit melting mark, and the martensite is the main material in the secondary short-circuit melting mark, and the grain boundary is provided with ferrite to separate out, no supporting body exists, and almost no air hole exists.
【作者单位】： 中国人民武装警察部队学院;
【分类号】：TG115.21;D918.91
本文编号：2501060
[Abstract]:The condition that the copper-clad steel wire of the copper-clad steel wire in the fire field is simulated is simulated, and a lead trace of a secondary short-circuit melting mark and a fire thermal effect is prepared. Metallographic analysis method is used to find the best metallographic etching agent, and the metallographic structure of the secondary short-circuit fusion mark is studied. The results show that 4% of the nitric acid alcohol is the best etching agent, the microstructure of the primary short-circuit melting mark is dominated by the fine martensite, and a small amount of dark troostite exists in the secondary short-circuit melting mark, and the martensite is the main material in the secondary short-circuit melting mark, and the grain boundary is provided with ferrite to separate out, no supporting body exists, and almost no air hole exists.
【作者单位】： 中国人民武装警察部队学院;
【分类号】：TG115.21;D918.91
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