The microstructure and strength properties of MA957 nanostructured ferritic alloy joints produced by friction stir and electro-spark deposition welding

Efficiency and availability driven R&D issues for DEMO

“…Concerning the phase stability and on the basis of the data presently available, this type of material should not be recommended for inservice temperature below ∼450 • C. In addition, in order to keep the oxide dispersion during joining processes, classical welding techniques based on melting are excluded. First trials of other methods such as diffusion welding [45] or stir friction welding [46] show encouraging results.…”

Gas tungsten arc welding and friction stir welding of ultrafine grained AISI 304L stainless steel: Microstructural and mechanical behavior characterization

“…Recently, solid state welding techniques are being developed to weld advanced materials [10][11][12]. For example, Miao et al [13] studied the microstructure and mechanical properties of an MA957 nanostructured ferritic alloy welded by friction stir welding and electrospark deposition welding. Their results showed a uniform fine scale ferrite structure with nanometer scale particles in the friction stir welded (FSW) joint region that caused welding efficiency values (weld zone strength / base metal strength) of more than 90%.…”

Some microstructural characterisations in a friction stir welded oxide dispersion strengthened ferritic steel alloy

“…The process has been successfully applied to non-ferrous materials such as aluminium [2] but also, by using suitable tool materials, to harder and higher melting point materials such high strength low-alloy steel [3]. However, very few papers report the use of the friction stir welding for ODS steels [4,5].…”