To provide a method for observing a surface layer part of a steel material, which can accurately grasp three-dimensional distribution of a second phase in the surface layer part of the steel material, and to provide a steel material manufacturing method capable of suitably correcting manufacturing conditions based on observation results.
When observing the three-dimensional distribution of the second phase in the surface layer part of the steel material, processing for determining an observation surface in the surface layer part and then treating the observation surface by a focused ion beam so that the treated surface becomes parallel with the observation surface and processing for observing the treated observation surface by a scanning electron microscope are repeated and respective observation results are integrated to grasp the three-dimensional distribution of the second phase on the surface layer part.
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NAGANO HIDEKI
Yamaguchi Yusuke
Kengo Yoshida