Structural characterisation of reaction zone for friction stir welded aluminium-stainless steel joint
作者： M Ghosh , A Kar , K Kumar , S V Kailas
DOI: 10.1179/175355509X12608916825994
关键词:
摘要: In the present investigation, commercially pure Al has been joined with 304 stainless steel (SS) by friction stir welding. The assembly finds widespread application in field of cryogenics, nuclear, structural industries and domestic appliances. Microstructural characterisation was carried out using scanning transmission electron microscopes. It found that diffusion Fe, Cr Ni is substantial within Al; however, 304SS limited. Owing to interdiffusion chemical species across bondline, discrete islands Fe3Al intermetallic form reaction zone. rubbing action tool over butting edge removed fine particles from 304SS, which were embedded stirring zone matrix. Subsequently, austenite underwent phase transformation ferrite due large strain this grain. Fracture path mainly moves through alloy under tensile loading; some places, presence compound also found.
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