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Phase and Microstructural Analysis of Hot Rolled FeNi42 Sheet, its Response in Magnetic and Mechanical Properties
Author(s) -
Jiraskova Y.,
Bursik J.,
Tucek J.
Publication year - 2011
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201000294
Subject(s) - materials science , hardening (computing) , metallurgy , intermetallic , ferromagnetism , oxide , brittleness , nickel , magnetization , martensite , grain boundary , scanning electron microscope , sheet metal , composite material , microstructure , condensed matter physics , magnetic field , physics , alloy , layer (electronics) , quantum mechanics
Inclusions unavoidably existing in steels and consequently also in final products obtained by e.g. rolling markedly affects the physical properties. This paper is devoted to investigation of FeNi42 steel hot rolled into a sheet form. The structural and phase analysis is done by scanning electron microscopy, X‐ray diffraction, and Mössbauer spectroscopy completed by magnetic and hardness measurements. The results yield an inhomogeneous nickel distribution in the sheet resulting in a formation of the intermetallic Ni 3 Fe phase. A depletion of sheet surface by nickel leads to an intensive surface oxidation; its thickness increases in the direction of sheet edges. The non‐metallic oxide inclusions are concentrated predominantly at grain boundaries, which contribute to an easier cracking. The formation of Ni 3 Fe affects a small increase in saturation magnetization. The oxides and consequently cracks formation cause magnetic hardening as can be seen on an increase of the structurally sensitive remnant magnetization. The hard oxide inclusions evoke also the hardening of material, rise brittleness and crack liability.