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<p><b>Abstract</b>—The magnetic characteristics and compressive mechanical properties of a hard magnetic isotropic Fe–30Cr–20Co–2Mo powder alloy subjected to cold rolling to a rolling reduction of 30–70% and subsequent multistage heat treatment, namely, annealing at 630°C and two-stage cooling, are studied. At all rolling reductions, the alloy is shown to have a single-phase structure, i.e., only an α-phase solid solution with a bcc structure is detected. The magnetic properties of the alloy decrease as the preliminary rolling reduction increases. The highest magnetic properties are observed at a rolling reduction of 30%; these are <i>B</i><sub>r</sub> = 0.91 T, <i>H</i><sub>c</sub> = 46.2&#xa0;kA/m, and (<i>BH</i>)<sub>max</sub> = 17.4 kJ/m<sup>3</sup>. After heat treatment, the yield stress <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11505_2025_11936_Article_IEq1.gif" Format="GIF" Height="18" Rendition="HTML" Resolution="72" Type="Linedraw" Width="26" /> </InlineMediaObject> <EquationSource Format="TEX">\(\sigma _{{0.2}}^{{\text{c}}}\)</EquationSource> <!--RusMet2570018Ustyukhin-m1--> </InlineEquation> of the alloy increases by more than 1.7 times, namely, to 1650–1800 MPa, whereas the compressive strength <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11505_2025_11936_Article_IEq2.gif" Format="GIF" Height="18" Rendition="HTML" Resolution="72" Type="Linedraw" Width="18" /> </InlineMediaObject> <EquationSource Format="TEX">\(\sigma _{{\text{u}}}^{{\text{c}}}\)</EquationSource> <!--RusMet2570018Ustyukhin-m2--> </InlineEquation> increases to ~2200 MPa. In this case, the alloy retains its plasticity at all rolling reductions, i.e., failure occurs at a strain ε<sub>c</sub> = 14–16%.</p>

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Magnetic and Mechanical Properties of a Cold-Rolled Isotropic Fe–30Cr–20Co–2Mo Powder Alloy

  • 期刊论文

  • 发表日期：

    2025年3月1日

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  • A. S. Ustyukhin,
  • V. A. Zelenskii,
  • I. M. Milyaev,
  • A. B. Ankudinov,
  • M. I. Alymov,
  • S. Ya. Betsofen,
  • A. A. Ashmarin,
  • A. S. Baikin

摘要

Abstract—The magnetic characteristics and compressive mechanical properties of a hard magnetic isotropic Fe–30Cr–20Co–2Mo powder alloy subjected to cold rolling to a rolling reduction of 30–70% and subsequent multistage heat treatment, namely, annealing at 630°C and two-stage cooling, are studied. At all rolling reductions, the alloy is shown to have a single-phase structure, i.e., only an α-phase solid solution with a bcc structure is detected. The magnetic properties of the alloy decrease as the preliminary rolling reduction increases. The highest magnetic properties are observed at a rolling reduction of 30%; these are Br = 0.91 T, Hc = 46.2 kA/m, and (BH)max = 17.4 kJ/m3. After heat treatment, the yield stress \(\sigma _{{0.2}}^{{\text{c}}}\) of the alloy increases by more than 1.7 times, namely, to 1650–1800 MPa, whereas the compressive strength \(\sigma _{{\text{u}}}^{{\text{c}}}\) increases to ~2200 MPa. In this case, the alloy retains its plasticity at all rolling reductions, i.e., failure occurs at a strain εc = 14–16%.