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<p>The effect of carbon balance (C<sub>bal</sub>) on structural properties and wear resistance of multi-component white cast irons was investigated. Specimens with varying C<sub>bal</sub> value from − 0.68 to +0.53% were produced via Y-block casting. Following annealing at 950&#xa0;°C, specimens were hardened through a liquid nitrogen spray from 1050 to 1100&#xa0;°C austenitizing. The hardened specimens (As-H) were tempered at three temperatures within 400–620&#xa0;°C at which the temperature giving the maximum tempered hardness (H<sub>Tmax</sub>), and those at lower (L-H<sub>Tmax</sub>) and higher (H-H<sub>Tmax</sub>) than H<sub>Tmax</sub> temperatures. The abrasive wear resistance was assessed using Suga (two-body) and Rubber wheel (three-body) wear testers. As-cast microstructures of all specimens presented a hypoeutectic composition, with the eutectic carbides identified as MC, M<sub>2</sub>C, and/or M<sub>7</sub>C<sub>3</sub> types, depending on the C<sub>bal</sub> value. The heat-treated matrices primarily comprised martensite, retained austenite, and secondary carbides. Both the hardness and the volume fraction of retained austenite (Vγ) were influenced by the C<sub>bal</sub> value of specimens and the following heat treatment conditions. The lowest specific wear specific (S<sub>WR</sub>, mg/N&#xa0;m<sup>2</sup>) was obtained in the As-H or H<sub>Tmax</sub> specimen, irrespective of the C<sub>bal</sub> value and austenitizing temperature. The S<sub>WR</sub> decreased continuously until 0%C<sub>bal</sub>, and then, it gradually increased as the C<sub>bal</sub> values went up. The S<sub>WR</sub> lowered with increasing the hardness. The S<sub>WR</sub> in the two-body wear test was reduced until 20%Vγ, and over that, it rose gradually. In the three-body wear test, however, the S<sub>WR</sub> did not change significantly even if the Vγ value increased up to about 60%.</p>

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Effect of Carbon Balance on Structural Properties and Wear Resistance of Multi-component White Cast Iron

  • 期刊论文

  • 发表日期：

    2025年6月12日

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  • Jatupon Opapaiboon,
  • Sudsakorn Inthidech,
  • Kaoru Yamamoto,
  • Yasuhiro Matsubara

摘要

The effect of carbon balance (Cbal) on structural properties and wear resistance of multi-component white cast irons was investigated. Specimens with varying Cbal value from − 0.68 to +0.53% were produced via Y-block casting. Following annealing at 950 °C, specimens were hardened through a liquid nitrogen spray from 1050 to 1100 °C austenitizing. The hardened specimens (As-H) were tempered at three temperatures within 400–620 °C at which the temperature giving the maximum tempered hardness (HTmax), and those at lower (L-HTmax) and higher (H-HTmax) than HTmax temperatures. The abrasive wear resistance was assessed using Suga (two-body) and Rubber wheel (three-body) wear testers. As-cast microstructures of all specimens presented a hypoeutectic composition, with the eutectic carbides identified as MC, M2C, and/or M7C3 types, depending on the Cbal value. The heat-treated matrices primarily comprised martensite, retained austenite, and secondary carbides. Both the hardness and the volume fraction of retained austenite (Vγ) were influenced by the Cbal value of specimens and the following heat treatment conditions. The lowest specific wear specific (SWR, mg/N m2) was obtained in the As-H or HTmax specimen, irrespective of the Cbal value and austenitizing temperature. The SWR decreased continuously until 0%Cbal, and then, it gradually increased as the Cbal values went up. The SWR lowered with increasing the hardness. The SWR in the two-body wear test was reduced until 20%Vγ, and over that, it rose gradually. In the three-body wear test, however, the SWR did not change significantly even if the Vγ value increased up to about 60%.