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<p>The present work investigates the effects of hot-rolling followed by quenching and tempering on high-cycle fatigue (HCF) behaviour and associated failure mechanisms in a novel low-carbon Nb + V microalloyed steel. The HCF study shows the highest fatigue limit for the hot-rolled + water-quenched (HRQ) sample compared to that of the as-received (AR) and tempered (T500) materials. The HRQ sample contains a relatively finer microstructure (2.4&#xa0;<i>µ</i>m) than AR (8.4&#xa0;<i>µ</i>m) and T500 (3.1&#xa0;µm), resulting in an excellent combination of fatigue (385&#xa0;MPa) and yield strength (1108&#xa0;MPa) with adequate ductility (14.4 pct) and impact toughness (32 ± 1&#xa0;J). Tempering the HRQ material at 500&#xa0;°C for 10 minutes (T500 sample) increases the tensile ductility to 18 pct, primarily due to the evolution of spherical second-phase particles and relaxation of quenched stresses. The failure analysis of the HCF-tested samples reveals that the crack is initiated predominantly at the interfaces of cementite particles/matrix and/or MnS inclusions/matrix. The HRQ sample displays the narrowest striation width (0.5&#xa0;<i>μ</i>m) in the crack propagation region, signifying a better resistance to crack growth. Furthermore, the possible HCF fracture mechanisms have been established for all the samples (AR, HRQ, and T500) based on the microstructure evolution before and after the HCF test and fracture surface characteristics.</p>

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High-Cycle Fatigue Behaviour and Damage Evaluation in a Nb–V Stabilized Low-Carbon Martensitic Steel

  • 期刊论文

  • 发表日期：

    2025年7月18日

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  • Pravendra Pratap Singh,
  • Suhrit Mula

摘要

The present work investigates the effects of hot-rolling followed by quenching and tempering on high-cycle fatigue (HCF) behaviour and associated failure mechanisms in a novel low-carbon Nb + V microalloyed steel. The HCF study shows the highest fatigue limit for the hot-rolled + water-quenched (HRQ) sample compared to that of the as-received (AR) and tempered (T500) materials. The HRQ sample contains a relatively finer microstructure (2.4 µm) than AR (8.4 µm) and T500 (3.1 µm), resulting in an excellent combination of fatigue (385 MPa) and yield strength (1108 MPa) with adequate ductility (14.4 pct) and impact toughness (32 ± 1 J). Tempering the HRQ material at 500 °C for 10 minutes (T500 sample) increases the tensile ductility to 18 pct, primarily due to the evolution of spherical second-phase particles and relaxation of quenched stresses. The failure analysis of the HCF-tested samples reveals that the crack is initiated predominantly at the interfaces of cementite particles/matrix and/or MnS inclusions/matrix. The HRQ sample displays the narrowest striation width (0.5 μm) in the crack propagation region, signifying a better resistance to crack growth. Furthermore, the possible HCF fracture mechanisms have been established for all the samples (AR, HRQ, and T500) based on the microstructure evolution before and after the HCF test and fracture surface characteristics.