日本金属学会誌

J. Japan Inst. Metals, Vol. 16, No. 3 (1952),
pp. 165-169

Studies on the Microstructure of Steel at High Temperatures by Means of the Emission-type Electronmicroscope

Nobuji Sasaki, Nagahiko Kishimoto, Ryuzo Ueda, Tôru Kuroda and Hajime Okamoto


Abstract:

A simple emission-type electron-microscope with a magnetic lens was constructed.Various methods of activation of the specimen surface were tested and discussed.With Ba and Sr as activator, observations were made of the austenite microstructure of various kinds of steels at high temperatures, which reminded us of the microstructure of austenitic manganese steel. The surface of the specimen cooled from high temperatures revealed a network cut in it, which coincided well with the electron image photographed just before the cooling. Polishing and etching of the surface showed that ferrite or cementite crystals had been formed along the network of austenite grain boundaries. It is suggested that mere heating in vacuum or in indifferent gases of a steel specimen with a polished surface might serve well as a substitute for the McQuaid-Ehn method for determining austenite grain size.


(Received 1951/10/3)

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