Abstract
Maraging400-like alloys were made by arc-melting iron with the alloy elements (i.e., Ni, Co, Ti and Mo), followed by a high temperature heat-treatment for solubilization. The solubilized alloys were further heat-treated (480 °C and 580 °C, by 3 h), for aging. The samples were finely characterized by X-ray diffraction (Rietveld refinement), Mossbauer spectroscopy and magnetization techniques. The results revealed that the as-solubilized sample is martensitic and ferromagnetic. Its residual induction and coercive field increase monotonically with the maximum applied field of a magnetization minor loop and both curves presented very similar shapes. The area of the minor loops varies parabolically with this maximum applied field. The aging induced an atomic rearrangement in the martensite phase, involving change in the composition and lattice parameters, reversion of austenite and the formation of the Fe 3 Mo 2 intermetallic compound. Comparisons are presented between the results obtained by us for these alloys and those obtained for Maraging-350 steel samples.
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