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Abstract <p>This paper examines the structural changes in P18 high-speed steel (18% W) obtained after strengthening thermocyclic treatment (STCT). STCT involves thermal cycling with solid-phase alpha-gamma transformations, quenching, and tempering. This results in the formation of several structural types: metastable, finely divided, and highly alloyed, as well as gradient and mosaic-discrete composite structures, which maximally improve the steel’s performance properties. After applying STCT to P18 steel under optimal conditions, compared to conventional thermal treatment, the following was achieved: a 56% increase in bending strength, a 25% increase in impact toughness, a 2-HRC increase in hardness (up to HRC 67), and a 1.4–12-fold increase in the tool life of various cutting tools.</p>

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Positive Changes in the Structure of High-Speed Steel as a Result of Strengthening Thermocyclic Treatment

  • 期刊论文

  • 发表日期：

    2026年8月4日

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  • A. A. Shmatov

摘要

Abstract

This paper examines the structural changes in P18 high-speed steel (18% W) obtained after strengthening thermocyclic treatment (STCT). STCT involves thermal cycling with solid-phase alpha-gamma transformations, quenching, and tempering. This results in the formation of several structural types: metastable, finely divided, and highly alloyed, as well as gradient and mosaic-discrete composite structures, which maximally improve the steel’s performance properties. After applying STCT to P18 steel under optimal conditions, compared to conventional thermal treatment, the following was achieved: a 56% increase in bending strength, a 25% increase in impact toughness, a 2-HRC increase in hardness (up to HRC 67), and a 1.4–12-fold increase in the tool life of various cutting tools.