摘要:
研究了铸造法制备的原位VCP增强钢基复合材料的组织和性能,探讨了复合材料的组织形成机理。结果表明,原位VCP增强钢基复合材料具有浇铸温度低(1723~1773 K),铸造成型性好的特点,适用于制备体积分数较高的颗粒内生复合材料;原位合成的VC颗粒细小,体积分数可达15 ％左右,并在基体中均匀分布;在复合材料组织中发现三种类型的VC增强相,即自熔体中析出的颗粒状VC,条状共晶VC和二次析出粒状VC;通过基体合金化,可以明显提高复合材料的组织稳定性,经923 K回火后,硬度可维持在HRC 60左右,明显提高了复合材料的高温磨损性能。
Abstract:
The microstructure and properties of in situ VCP/steel composite fabricated by casting are investigated, and the formation mechanism of the composite microstructure is also analysed. The results show that in situ VCP /steel composite has low pouring temperature (1723~1773 K) and good cast forming. It is suited to fabricate the in situ composite that demands a large reinforced particle volume fraction. In situ VCP composite contains fine VC particles, which distribute homogeneously in the matrix, and 15 % particle volume. Three types of reinforced VC phases, granular VC from melt, strip eutectic VC, and granular VC separated from matrix, were found in composite microstructure. The composite microstructure stability can be remarkably improved by alloying matrix. After 923 K temperature, the composite can still hold hardness at HRC 60. This property can improve the composite wear-resistance at high temperature.
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