Destructive and non-destructive evaluation methods of interface on F82H HIPed joints

Highlights: • The first wall of F82H steel will be fabricated by the HIP method. • Inspection techniques need to be developed for the HIPed interface. • Both destructive and non-destructive inspection techniques are introduced. - Abstract: The first walls of F82H steel with built-in cooling channels will be assembled thin plates and rectangular pipes by a HIP method. Silicon oxides form on an interface of HIPed joints during HIPing and result in the lowering of toughness of the HIPed joints. A large issue is investigation method of HIPed interface. The flexibility of specimen size for the investigation will be necessary because of the thin wall of cooling channels. A small specimen destructive test technique which is able to distinguish a base metal and an excellent HIPed joint has been desired, and recent researches find out a torsion test method to solve the issue. Non-destructive test technique is another issue for the inspection of the first wall. An ultrasonic inspection method is a candidate but silicon oxides are too small to produce good flaw echo from oxides, some solutions will be necessary. Present research introduces the current status of development of small specimen destructive test technique and the ultrasonic method for the first wall inspection.