摘要
采用有限元模型和具备温度判据的热源子程序模拟自蔓延过程,分析工艺参数对自蔓延过程温度场的影响规律。通过实验测试表面及体系内部的温度随时间的变化,用以验证有限元模型和热源子程序的有效性。结果表明:自蔓延过程中燃烧波的形貌一致,压坯表面温度分布相近,该有限元模型能够准确反映自蔓延过程的温度变化。钢基体表面温度随燃烧波的扩展依次达到最高温度,且各位置所能达到最高温度不相同,呈波浪分布,温度范围为913.4~1 044.0℃。预热使Ni/Al压坯和基体表面温度升高,且后者升温幅度相对较小。在预热到300℃时,基体表面温度可达到1 123.3℃。由中间引燃Ni/Al反应时,与一侧引燃相比,蔓延速率相同,但蔓延时间减少一半,使得燃烧更集中,压坯和基体中的温度更高。
A finite element model with a heat source based on a temperature criterion was used to simulate the combustion synthesis process of the Ni Al coating, and the influences of the processing parameters on the distributions of the temperature were analyzed. In addition, the surface and inner temperatures of the reaction system were tested by a thermal infraraed imager and a thermocouple, respectively. The simulated and experimental results of surface temperature distributions of the NiAl compact in the self propagating process are similar, indicating that the finite element model can accurately simulate the temperature changes of the self propagating process. The surface temperature of the substrate reaches the maximum temperature with the propagating of combustion wave. The highest surface temperature at different locations of the matrix are different, distributed wavily, lying at 913.4-1 044.0 ℃. The temperature of the Ni/Al compact and the substrate can be increased by a preheating. When preheating to 300 ℃, the surface temperature of the substrate can reach 1 123.3 ℃. When the Ni/Al reaction was ignited from the middle, the spead rate was the same as that ignited from the side, but the spead time was reduced by half, which caused the combustion more concentrated and the temperature of the compact and substrate higher.
引文
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