Characterising electron beam welded dissimilar metal joints to study residual stress relaxation from specimen extraction

摘要: Abstract Nuclear power plants require dissimilar metal weld joints to connect the primary steam generator made from ferritic steel intermediate heat exchanger austenitic steel. Such are complex because of mismatch in thermal and mechanical properties materials used joint. Electron Beam (EB) welding is emerging as a promising technique manufacture providing great many advantages over conventional techniques, terms low input, high intensity, narrow fusion affected zones, deeper penetration increased speeds. However before this method can be considered for implementation an actual plant, it essential careful comprehensive outlining joint characteristics apparent effects on performance during service. In present study, EB welded was manufactured using AISI 316LN stainless ferritic-martensitic P91 steel, without addition filler material. Neutron diffraction measurement conducted plate measure residual stress distribution across well through thickness plate. A finite element analysis two-dimensional cross-sectional model ABAQUS code simulate process predict stresses, implementing solid-state phase transformation experienced by The predicted stresses were transferred 3D machining extraction C(T) blank specimen extent relaxation studied.