On the magnetic anisotropy of superduplex stainless steel

Abstract

a b s t r a c tThe austenite-ferrite superduplex stainless steel (SDSS) is essentially an Fe-Cr-Ni alloy to which additional elements (e.g. Mo, Mn, Si, Cu, C, P, S) were added so as to confer additional advantageous characteristics such as higher mechanical strength and resistance to corrosion. Many of its applications require the process of rolling which, due to the two-phase character, induces a marked texturing, elongation of grains, and directional ordering in each of the constituent phases. This, in turn, imprints a strong anisotropic features in the mechanical, magnetic, and other properties. Using various experimental techniques, such as magnetization and ac susceptibility, this work investigated the induced magnetic anisotropy. An easy axis (parallel to the rolling direction) anisotropy was observed. The nature of the magnetic anisotropy, manifested during low and high applied magnetic fields, will be discussed in terms of the combined influences of two main anisotropies, namely shape anisotropy (arising from demagnetizing forces) and texture anisotropy (arising from the induced preferred orientation).

Determination of the demagnetisation of electrical steel strips

“…In such cases as the measurement of electrical steel strips using an open magnetic circuit or an online yoke type tester with air gaps between the sample and the yokes, the demagnetising field cannot be entirely eliminated. Concerted effort has been dedicated on determination and computation of demagnetising effects [6][7][8][9][10]. The actual magnetic field in the sample can be accurately measured using the Rogowski-Chattock potentiometer or an H-coil.…”

Detection of the Magnetic Easy Direction in Steels Using Induced Magnetic Fields

“…The magnetic properties of electrical steels such as core loss and magnetic induction depend on the microstructure and texture, which result from thermo-mechanical processes like slab reheating, hot-and cold-rolling, and final recrystallization annealing [10][11][12][13][14][15]. These processes can also generate noticeable magnetic anisotropy in the material because the magnetic behavior of steels strongly depends on their stress and strain states [11,13,[16][17][18][19][20].…”

Caracterização eletroquímica e proposta de metodologia para a determinação da temperatura crítica de pite de aços inoxidáveis super duplex UNS S32760

“…As duas fases distintas do Aço Inoxidável Super Duplex, apresentam características magnéticas diferenciadas, devido às suas microestruturas CCC e CFC, sendo a fase α -ferrítica magnética, e a fase γaustenítica não magnética [31], o que faz com que este tipo de liga tenha um comportamento, no geral, de um material magnético.…”