Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : October 07, 2017 - October 09, 2017
With Gr. 91 boiler piping base metals used for a long time in ultra-supercritical (USC) power plant as target, a small sample was taken using the electric discharge sampling equipment, and we investigated the affected layer thickness by the electric discharge processing method, the dimensional accuracy of the small sample , and processing after sampling of small samples. As a result, it was confirmed that the thickness of the processing influence layer by the electric discharge processing method is within about 30 μm for both the sample and the pipe side, the sampling accuracy in the thickness direction of the sample is about ± 0.2 mm. In addition, almost no processing influence layer after grinder molding was found.
