EUROPEAN CONGRESS AND EXHIBITION ON ADVANCED MATERIALS AND PROCESSES - EUROMAT 2021

Diffusion bonding is a candidate joining method for Plasma Facing Components in fusion reactors effected significant investigations over the last decades. One of the technological challenges for fusion reactors is the joining of flat metal parts with a reliable contacts on their welding seams. The hot isostatic pressure (HIP) bonding is a well-known technology, however the development of new materials like ceramic dispersion strengthened (CDS) 316L stainless steels require new investigation of its diffusion bonding capabilities. As a continuation of an earlier work [T. Baross, 2019], where diffusion bonding of 316L specimens were tested on the Gleeble 3800 thermomechanical physical simulator, five CDS specimens were diffusion bonded with standard 316 L samples on temperature range 950-1000 °C and under mechanical pressure of 20 – 30 MPa. The oxide dispersion-strengthened (ODS) 316L stainless steels were prepared by powder technology by Balázsi et al (2011) by spark plasma sintering (SPS). The two starting composition were the following: 316L and 316 L/1 wt% Al2O3. During the procedure, the ODS samples showed significant larger electrical resistance and creep properties, which may the consequences of the large current density. The values of electrical resistance were approximated by the earlier developed models. Further investigation revealed the microstructural alterations during the long bonding process lasting 40-60 min.