日本金属学会誌

J. Japan Inst. Metals, Vol. 51, No. 3 (1987),
pp. 194-200

Analysis of Hydrogen Behavior in Cr-Mo Steels by Electron Microscopic Autoradiography

Teruo Asaoka1, Hideo Saito2, Norio Nogawa3, Naotake Morikawa3 and Yoichi lshida2

1Faculty of Science and Engineering, Tokyo Denki University, Saitama
2Institute of Industrial Science, University of Tokyo, Tokyo
3Radio Isotope Centre, University of Tokyo, Tokyo

Abstract:

By using electron microscopic tritium autoradiography and tritium release measurements, the hydrogen behavior in heat-treated Cr-Mo steels was analyzed.
The optimum experimental conditions for autoradiography were first determined including the tritium charging of the sample, selection of nuclear emulsions, protective films of the sample surface, sub-zero temperature exposure and development.
The autoradiographic observations by thin foil transmission electron microscopy, replica electron microscopy and electron microprobe analyser revealed that, prior austenite grain boundary, martensite-lath interfaces, precipitate-matrix interfaces and MnS inclusion-matrix were the trap sites for hydrogen in these steels. Tritium release measurement enabled us to separate quantitatively mobile and trapped hydrogen in these steels.


(Received 1986/10/1)

Keywords:

electron microscopic autoradiography, high voltage electron microscopy, tritium charge, tritium release measurement, hydrogen trap, chromium-molybdenum steel


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