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<p>Cobalt-based Tribaloy<sup>TM</sup> T800 alloy shows potential for applications in environments prone to elevated temperature wear and corrosion. However, their widespread use is hindered by challenges in processability due to the poor toughness arising from the high volume fraction of intermetallic Laves phase and limited oxidation resistance due to volatile Mo oxide formation. This study investigates the systematic modification of T800 by Fe and Ni alloying through the addition of 10, 25, and 40 wt pct stainless steel 316L to tailor the microstructure and assess its effect on bulk toughness, tribological, and high-temperature oxidation performance. The incorporation of SS316L reduced the proportion and size of the brittle primary Laves phase, promoting eutectic aggregation, which led to substantial improvement in flexural stress and strain, increasing three-point bending strength from 500&#xa0;MPa to 1500&#xa0;MPa and fracture strain from 2 to 5 pct. Although the reduction in hard phases resulted in reduced hardness and wear performance, it significantly enhanced oxidation resistance. The blended alloy exhibits an 86 pct reduction in mass gain compared to T800 after 250 hours of exposure at 800&#xa0;°C, due to the development of a finer microstructure that facilitates rapid Cr<sub>2</sub>O<sub>3</sub> formation. Among the modified alloys, T8S10 possesses wear resistance similar to T800 with a substantial increase in toughness, and T8S40, with a eutectic microstructure containing 40 pct Laves phase, offers superior high-temperature oxidation resistance while mitigating the brittleness of T800, thereby emerging as a promising candidate for demanding environments.</p>

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Laves Phase Modulation in TribaloyTM T800 via Stainless Steel Addition to Improve Toughness and High-Temperature Oxidation Resistance

  • 期刊论文

  • 发表日期：

    2026年3月17日

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  • Shubhra Kamal Nandi,
  • Allan Matthews,
  • Philip J. Withers,
  • Joern Stermsek,
  • Christian Fuchs,
  • Indranil Manna,
  • Siddhartha Roy

摘要

Cobalt-based TribaloyTM T800 alloy shows potential for applications in environments prone to elevated temperature wear and corrosion. However, their widespread use is hindered by challenges in processability due to the poor toughness arising from the high volume fraction of intermetallic Laves phase and limited oxidation resistance due to volatile Mo oxide formation. This study investigates the systematic modification of T800 by Fe and Ni alloying through the addition of 10, 25, and 40 wt pct stainless steel 316L to tailor the microstructure and assess its effect on bulk toughness, tribological, and high-temperature oxidation performance. The incorporation of SS316L reduced the proportion and size of the brittle primary Laves phase, promoting eutectic aggregation, which led to substantial improvement in flexural stress and strain, increasing three-point bending strength from 500 MPa to 1500 MPa and fracture strain from 2 to 5 pct. Although the reduction in hard phases resulted in reduced hardness and wear performance, it significantly enhanced oxidation resistance. The blended alloy exhibits an 86 pct reduction in mass gain compared to T800 after 250 hours of exposure at 800 °C, due to the development of a finer microstructure that facilitates rapid Cr2O3 formation. Among the modified alloys, T8S10 possesses wear resistance similar to T800 with a substantial increase in toughness, and T8S40, with a eutectic microstructure containing 40 pct Laves phase, offers superior high-temperature oxidation resistance while mitigating the brittleness of T800, thereby emerging as a promising candidate for demanding environments.