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通过对DT合金各相的成份、形貌、结构特点的观罕及热处理工艺对其影响的分析,揭示出该合金的显微特征,并就进一步提高合金性能从理论上进行了初步探讨。碳化钨相与基体相在加热到高温时发生相互溶解和扩散。各元素的分布有一定的规律。扩散的结果强化了两相的结合。碳化钨相存在溶解、析出和长大倾向不同的两种颗粒,它们的形貌和成份均不同,一种是W向基体扩散较多、外形已明显“球化”的颗粒;另一种是W向基体扩散较少,外形尚未明显“球化”的颗粒。通过比较认为:若能使合金中碳化钨相颗粒实现“球化,”可能有利于提高性能。固溶有其他元素的碳化钨相仍保持WC的结构类型,但晶格常数大于WC,而且随回火温度提高,晶格常数a和c减小。
By analyzing the composition, morphology, structural features and the influence of the heat treatment process on the phases of the DT alloys, the microscopic characteristics of the alloy are revealed and the theoretical study on the further improvement of the properties of the alloy is also given. The tungsten carbide phase and the matrix phase are dissolved and diffused when heated to a high temperature. The distribution of the elements have certain rules. The result of the diffusion strengthens the combination of the two phases. Tungsten carbide phase exists dissolution, precipitation and growth tendency of two different particles, their morphology and composition are different, one is W to the matrix diffusion more shape has been obviously “nodular” particles; the other is W to the matrix diffusion less shape has not yet obvious “ball” of the particles. By comparison, it is considered that if the tungsten carbide particles in the alloy can be “spheroidized”, it may be beneficial to improve the performance. Tungsten carbide phase solid solution with other elements still maintain the structure type of WC, but the lattice constant is greater than WC, and with the tempering temperature increases, the lattice parameters a and c decrease.