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<p>The effect of mischmetal on the mechanical properties of hot compressed low-carbon aluminum-killed (LCAK) steel was studied. An increased mischmetal content in LCAK steel increased yield strength and ultimate tensile strength. While ductility also improved with mischmetal additions up to 260&#xa0;ppm in steel, a noticeable decline was observed beyond that point. Fractography analysis showed rough and fibrous surfaces with dimples. The size, number, and distribution of these dimples varied significantly with inclusion size, shape, and distribution. Mischmetal addition significantly refined the grains in LCAK steel. We demonstrated that rare earth (RE)-modified inclusions pinned the austenite grains, leading to grain refinement.&#xa0;We showed that acicular ferrite nucleated effectively at the RE-modified inclusions, attributed to the estimated low lattice misfit of inclusions with the steel matrix. Optimally treated steel with 260&#xa0;ppm RE demonstrated the slowest work-hardening rate against strain in later stages of hardening, enhancing mechanical properties. On the other hand, the untreated sample showed the highest fall of work-hardening rate, earlier necking, and failure at the last stage of hardening.</p>

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Effect of Mischmetal Treatment on the Microstructure, Tensile Properties, and Fracture Behavior of Hot Compressed Low-Carbon Aluminum-Killed (LCAK) Steel

  • 期刊论文

  • 发表日期：

    2025年10月18日

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  • Nachiketa Yadav,
  • Gour Gopal Roy

摘要

The effect of mischmetal on the mechanical properties of hot compressed low-carbon aluminum-killed (LCAK) steel was studied. An increased mischmetal content in LCAK steel increased yield strength and ultimate tensile strength. While ductility also improved with mischmetal additions up to 260 ppm in steel, a noticeable decline was observed beyond that point. Fractography analysis showed rough and fibrous surfaces with dimples. The size, number, and distribution of these dimples varied significantly with inclusion size, shape, and distribution. Mischmetal addition significantly refined the grains in LCAK steel. We demonstrated that rare earth (RE)-modified inclusions pinned the austenite grains, leading to grain refinement. We showed that acicular ferrite nucleated effectively at the RE-modified inclusions, attributed to the estimated low lattice misfit of inclusions with the steel matrix. Optimally treated steel with 260 ppm RE demonstrated the slowest work-hardening rate against strain in later stages of hardening, enhancing mechanical properties. On the other hand, the untreated sample showed the highest fall of work-hardening rate, earlier necking, and failure at the last stage of hardening.