Thackray Richard, Palmiere Eric J, Khalid Omar
Department of Materials Science and Engineering, The University of Sheffield, Portobello Street, Sheffield S1 3JD, UK.
Materials (Basel). 2020 Jul 24;13(15):3296. doi: 10.3390/ma13153296.
The etching of prior austenite grain boundaries in martensite for detailed quantitative metallography of low to high carbon steel has been carried out using aqueous solutions of picric acid containing different wetting agents. The choice of wetting agent was shown to be dependent on the carbon content of the steel, with sodium dodecyl sulfate (SDS) being more suitable for use with low and medium carbon steels, whereas sodium dodecylbenzene sulfonate (SDBS) was shown to be more appropriate for high carbon steels. It is also recommended that, for a particular steel, a variety of temper treatments should be carried out in order to reveal grain boundaries, particularly where more detailed results than simple grain size measurements are required. Finally, the use of dummy specimens prior to etching of the real samples was shown to reduce the need for re-polishing and re-etching of the samples.
为了对低碳到高碳钢进行详细的定量金相分析，已使用含有不同润湿剂的苦味酸水溶液对马氏体中的原奥氏体晶界进行蚀刻。结果表明，润湿剂的选择取决于钢的碳含量，十二烷基硫酸钠（SDS）更适合用于低碳和中碳钢，而十二烷基苯磺酸钠（SDBS）则更适合用于高碳钢。还建议，对于特定的钢种，应进行多种回火处理以显示晶界，特别是在需要比简单晶粒尺寸测量更详细结果的情况下。最后，结果表明，在蚀刻真实样品之前使用虚拟样品可以减少对样品进行重新抛光和重新蚀刻的需求。
