在Cr35Ni45型高温合金失效裂解炉管金相试样的制备、显示过程中, 组织显示是一个难点。通过试验研究证明: 因渗碳使内、外壁抗腐蚀性能相差较大的高温合金裂解炉管金相试样, 可以使用配置比例为FeCl3∶HCl∶H2O=5 g∶50 mL∶300 mL的腐蚀剂, 通过分区域、分别腐蚀的方法得到较好衬度的宏观和微观组织形貌。良好的组织显示可以为后续的光学金相观察以及进一步的电子显微分析提供基础支持。

Microstructure display represents a difficult point in the preparation and exhibition process of the metallographic specimen of failure cracking furnace tube of Cr35Ni45 high-temperature alloy. The experiments indicated that etching liquid of FeCl3∶HCl∶H2O=5 g∶50 mL∶300 mL could be applied to the metallographic specimens with relatively significant performance differences in terms of anti-etching capability due to between inner and outer surfaces, with the approach of segmented and separated etching of different zones, an optimal etching effect of macrostructure and microstructure with clear contrast could be achieved. A satisfactory structure display in its turn would provide fundamental support to the follow-on optical metallographical observation and further electronic microscope analysis.