Railway Castings, as important load-bearing parts in railway programs, have their internal microstructure straight identifying the effectiveness and service life. Metallographic Investigation, by revealing the microstructure features of components, provides a immediate foundation for the quality evaluation of track castings. one.Technical methods of metallographic Assessment 1.one Met... https://talkitter.com/post/456844_with-the-development-of-big-data-the-internet-of-things-and-artificial-intellige.html