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<p>Based on finite element numerical simulation, the stress field, temperature field, and solidification behavior of WC/Fe matrix composites were predicted at casting temperatures of 1425, 1450, 1475, 1500, 1525, 1550, 1575, and 1600&#xa0;°C. The results of the reach demonstrate that the temperature distribution between the preform and the matrix varies with the pouring temperature. The temperature change curve around the preform is observed to be the gentlest when the temperature reaches 1575&#xa0;°C, which is not easy to produce the phenomenon of radical cooling during the solidification process. With the increase in casting temperature, the stress distribution on the surface of the preform shows the trend of increasing first and then decreasing; when the casting temperature is 1575&#xa0;°C, the stress produced on the surface of the preform has a minimum value of 703.2&#xa0;MPa, and the distribution is uniform. However, as the casting temperature continues to rise, the WC ceramic particles on the surface of the preform are completely reacted and dissolved. As a consequence of the elevated temperature, the temperature of the composite zone declines at a rapid rate during the solidification phase. This results in a considerable discrepancy in temperature between the composite zone and the matrix, which in turn gives rise to a pronounced surge in stress. It was experimentally verified that the WC ceramic particles in the preform and the iron matrix diffused to form a well-bonded interfacial layer during the casting process at a casting condition of 1575&#xa0;°C, and the WC/Fe matrix composite was successfully prepared.</p>

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Stress field simulation and solidification mechanism of WC/Fe matrix composites at different casting temperatures

  • 期刊论文

  • 发表日期：

    2025年3月28日

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  • Lin Yang,
  • Yifan Shi,
  • Di Wu,
  • Zhixiang Yang,
  • Fei Zhang,
  • Zulai Li

摘要

Based on finite element numerical simulation, the stress field, temperature field, and solidification behavior of WC/Fe matrix composites were predicted at casting temperatures of 1425, 1450, 1475, 1500, 1525, 1550, 1575, and 1600 °C. The results of the reach demonstrate that the temperature distribution between the preform and the matrix varies with the pouring temperature. The temperature change curve around the preform is observed to be the gentlest when the temperature reaches 1575 °C, which is not easy to produce the phenomenon of radical cooling during the solidification process. With the increase in casting temperature, the stress distribution on the surface of the preform shows the trend of increasing first and then decreasing; when the casting temperature is 1575 °C, the stress produced on the surface of the preform has a minimum value of 703.2 MPa, and the distribution is uniform. However, as the casting temperature continues to rise, the WC ceramic particles on the surface of the preform are completely reacted and dissolved. As a consequence of the elevated temperature, the temperature of the composite zone declines at a rapid rate during the solidification phase. This results in a considerable discrepancy in temperature between the composite zone and the matrix, which in turn gives rise to a pronounced surge in stress. It was experimentally verified that the WC ceramic particles in the preform and the iron matrix diffused to form a well-bonded interfacial layer during the casting process at a casting condition of 1575 °C, and the WC/Fe matrix composite was successfully prepared.