Study on Application Performance of Instrument Valve Body Formed by Selective Laser Melting for Nuclear Power Plant

Abstract

A 316L stainless steel instrument valve body which with complex internal flow passage and used for primary loop flow measurement in pressurized power plant along with test specimen were printed by selective laser melting. The optical metallography of specimen showed the microstructure transform to be uniform after heat treatment state. The residual stress test was tested on three different position on the valve body after heat treatment. The results showed that the valve body mainly had a surface residual compressive stress, and the max main stress was in a range of-367.27MPa to 34.97MPa which get higher along the building direction. Then the application performance of intergranular corrosion test and hydraulic test on the valve body showed a good performance and the result could meet the acceptance requirements of the construction rule.