Tungsten/reduced activation ferritic–martensitic steel joints made with an Fe–Si–B amorphous filler

Abstract

The joining of Tungsten (W) and reduced activation ferritic–martensitic steel (RAFMs) is crucial to the fabrication of divertors in future fusion reactors. In this work, an Fe75.0Si8.33B16.67 (at.-%) amorphous filler and iron interlayer are considered for brazing W and RAFMs. Crack-free joints in both the as-brazed and post joining heat treatment (PJHT) states have been obtained by short-time vacuum brazing at 1230°C. The bonding seams of the joints are composed of an α-Fe matrix, fine FeWB and Fe3B particles. The PJHT joint exhibits a high strength of 310 MPa and room temperature plasticity. The strong and tough joint would be appealing in its thermal cycling and thermal shock performance.