Clarification of the false liquation crack existed in 9% Cr/CrMoV dissimilar welded joint by comparative etching process and in situ laser scanning confocal microscope

Liquation cracks are generally regarded as thermal defects in various materials, e.g. in steels and nickel-based alloys. However, direct observation of microstructure with crack-like morphology that may be revealed by chemical etching or electrochemical etching methods, might lead to the misinterpretation of liquation cracks. To avoid the possible misinterpretation, comparative etching was employed to reveal the effect of various etching...