In order to deter-nine continuously the austenite grain size of steels with a high temperature microscope, observations of the austenite grain growth of 0.2%C steels (Si-Nn killed, or Al killed) in various atmospheres were carried out. The results obtained were as follows: (1) When 0.2%C steels were heated in 3•~10-5mmHg vacuum, the austenite grains on the surface were coarsened of their grain size was nearly equal to that of the inner grains. (3) According to an electron microscopic study, the degree of oxidation oil the specimen surface in high vacuum was less in grain size were observed. (4) As regards the surface grain growth of 0.2%C steels in various atmospheres, it was observed that the lower the degree of vacuum or the higher the argon pressure, the higher the grain coarsening temperature. several microns in depth even after removing the mechanically polished layer by electrolytic polishing.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.