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<p>This study investigates the effects of chemical composition and cooling rate on the continuous cooling transformation behavior and mechanical properties of two high-strength low-alloy wear-resistant steels, designated as 1# (0.14C-0.35Si-1.3Mn-0.71Cr) and 2# (0.17C-0.27Si-1.25Mn-0.75Cr). Compared with 1# steel, the higher C and Cr contents in 2# steel promote finer bainite and martensite microstructures. Static and dynamic continuous cooling transformation diagrams reveal that 2# steel exhibits a broader range of bainite transformation and a higher proportion of bainite at elevated cooling rates. Austenite deformation in 2# steel raises the martensite transformation start temperature while lowering the completion temperature, thus refining the microstructure. Mechanical testing shows that 2# steel displays ductile fracture with significantly higher low-temperature impact toughness (31.02 J/cm<sup>2</sup>) than 1# steel (18.56 J/cm<sup>2</sup>). The superior toughness of 2# steel is attributed to its refined grain size, higher fraction of lower bainite, and increased high-angle grain boundaries. These findings offer valuable insights into the design and processing of wear-resistant steels with balanced strength and toughness.</p>

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The Effect of Composition on the Continuous Cooling Transformation Behavior and Mechanical Properties of HSLA Wear-Resistant Steels

  • 期刊论文

  • 发表日期：

    2025年6月25日

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  • Jixun Jiang,
  • Fangcheng Qin,
  • Lianming Zhang,
  • Hongli Zhao,
  • Yuehua Kang

摘要

This study investigates the effects of chemical composition and cooling rate on the continuous cooling transformation behavior and mechanical properties of two high-strength low-alloy wear-resistant steels, designated as 1# (0.14C-0.35Si-1.3Mn-0.71Cr) and 2# (0.17C-0.27Si-1.25Mn-0.75Cr). Compared with 1# steel, the higher C and Cr contents in 2# steel promote finer bainite and martensite microstructures. Static and dynamic continuous cooling transformation diagrams reveal that 2# steel exhibits a broader range of bainite transformation and a higher proportion of bainite at elevated cooling rates. Austenite deformation in 2# steel raises the martensite transformation start temperature while lowering the completion temperature, thus refining the microstructure. Mechanical testing shows that 2# steel displays ductile fracture with significantly higher low-temperature impact toughness (31.02 J/cm2) than 1# steel (18.56 J/cm2). The superior toughness of 2# steel is attributed to its refined grain size, higher fraction of lower bainite, and increased high-angle grain boundaries. These findings offer valuable insights into the design and processing of wear-resistant steels with balanced strength and toughness.