Affiliations: Dipartimento di Scienze dei Materiali e della Terra, Universita’ 60131, Ancona, Italy | INFM (Istituto Nazionale per la Fisica della Materia)-Ancona Unit, Italy | Studsvik Neutron Research Laboratory Uppsala University S-61182, Nyköping, Sweden | Istituto di Scienze Fisiche, Universita’ 60131, Ancona, Italy | National R&D Institute for Welding and Material Testing-ISIM, Timisoara, Romania | NUOVA M.A.I.P SpA, Viale Cavallotti n.30, 60035, Jesi (AN), Italy
Note: [] Corresponding author Address: Dipartimento de Fisica e Integrieria dei Materiali e del Territorio, Universita 60131, Ancona, Italy: ph +39 071 220 4735; fax +39 071 220 4729; e-mail: gialbe@popcsi.unian.it
Abstract: As part of an integral study on operation and safety of centrifuges for food processing and agricultural applications, neutron diffraction measurement was carried out on a bowl (rotor of a centrifuge) to investigate residual stresses due to manufacturing. The bowl was made of duplex stainless steel containing 50 vol% austenite and 50 vol% ferrite. The results reveal high tensile stresses in the austenite phase and high compressive stresses in the ferrite phase. In addition, significant macroscopic stresses were observed in the hoop direction, which decreased with increasing distance from the upper surface of the bowl. The observed residual stresses were attributed to different processes employed during manufacturing.
