Laser welding of amorphous nickel-based alloy strips
Abstract
An increase in the mutual solubility of elements, changes in the structure's morphology, the grinding of structural elements, the creation of new metastable phases, and the transformation of metallic materials into microcrystalline and occasionally amorphous states are all effects of the ultra-rapid cooling of melts. Due to the previously mentioned changes in microstructure, phase composition, crystal structure, and even state, many of the physicochemical properties change both qualitatively and quantitatively during ultra-fast quenching. The authors solved the problem of joining amorphous tapes to make a wider range of finished products and semi-finished items from quick-hardening alloys. Any attempt to make such a connection via soldering or arc welding runs the risk of dissolving the amorphous structure and creating brittle crystalline formations. To reduce the likelihood of this influence, the welding bath must be cooled quickly (above 105 °С/s). Studies show that following laser welding, the principal metal of the quasi-amorphous Ni-Fe-Cr-Si-B alloy tape does not crystallize. The resulting structures in the welded joint zone are of a finer character, according to a comparison between the amorphous structures in the base metal and the weld zone. Laser welding is thus a viable technique for joining amorphous tapes. Studies have been done on creating a welded junction of amorphous strips that are both long and wide in order to generate a wider variety of semi-finished items and final products from quick-hardening alloys. It was noted that there was no transformation of the amorphous alloy into the crystalline state following laser welding. It has been shown that it is mostly feasible to fuse an amorphous tape using laser light while preserving the amorphous structure.
Key words: amorphous materials, experimental studies, laser welding, transmission electron microscopy, structure
