工艺参数对WC颗粒增强表层复合材料与钢基界面组织的影响

以45钢为基材,通过放电等离子烧结和铸造工艺成功制备了WC颗粒增强表层复合材料,研究不同浇铸工艺参数对表层WC/Fe复合材料与基材之间的界面结合及微观组织的影响。结果表明:随着浇铸量的增加,锭模的数值模拟温度可达1493 ℃,高温停留时间约734 s,为实现钢液与WC/Fe复合材料冶金结合提供有利条件,但是过高的浇铸量使WC/Fe复合材料的组织发生明显的变化,几乎观察不到WC增强相,组织出现大量鱼骨状碳化物Fe₃W₃C。当浇铸量控制在锭模体积的2/5时,可得到良好的WC/Fe复合材料与基材的宏观界面,界面反应产物Fe₃W₃C增加,但是增强颗粒仍保留了浇铸前的原始形貌。

Effect of process parameters on interfacial microstructure of WC particle reinforced surface composite and steel substrate

WC particle reinforced surface composite was prepared on 45 steel as substrate material by spark plasma sintering and then casting process. The effects of various casting process parameters on the interface bonding and microstructure between the WC/Fe composite and the steel substrate were studied. The results show that when the casting amount increases, the numerical simulation ingot mold temperature may reach 1493 ℃, and the high temperature residence duration is about 734 s, providing favorable conditions for realizing the metallurgical bonding of molten steel and WC/Fe composite material. However, due to the large casting quantity, the microstructure of the WC/Fe composite material changes noticeably, and the WC strengthened phase is hardly observed, while a lot of fishbone carbide Fe₃W₃C appears in the microstructure. When the casting quantity is set to 2/5 of the mold volume, a good macroscopic interface between the WC/Fe composite and the steel substrate is formed, and the interface reaction product Fe₃W₃C increases, but the original morphology of the reinforced particles is still preserved.