Ultrasonic Testing of Nickel-based Superalloy Fastening Bolts

The article aims to study the nickel based high-temperature alloy and martensitic stainless steel bolts of type 600~1 000 MW power plant ultra-supercritical sets. By developing the special test block, the probe and the test block with simulated bolt flaws based on the classification of diameter and steel type, a new ultrasonic testing process method was formed.