Microstructure and Magnetic Properties of Sintered Fe50Ni and 410L Stainless Steel

摘要

Soft magnetic materials are used in many applications. When good combination of corrosionresistance and magnetic permeability is necessary, as for electrovalves for chemical industries, it canbe obtained with iron-nickel alloys and with ferritic stainless steels. Fe50Ni has higher magneticproperties but 410 stainless steels are less expensive. Porosity reduces drastically magneticproperties, especially permeability, so the difference between sintered Fe50Ni and sintered 410stainless steels should be lower. The aim of this paper is to investigate this difference. A mixture ofatomized Fe powder and carbonyl Ni powder were used to produce Fe50Ni alloys. Commercialatomized pre-alloyed 410L powder was used to produce ferritic stainless steel. Rings and smallcylinders were pressed and sintered. Sintering was carried out in a high temperature vacuum furnace(rings) and in a thermal dilatometer (small cylinders). Microstructural features were investigated bymicroscopy. Magnetic properties were determined throughout magnetization curves.