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

doi:10.13251/j.issn.0254-6051.2021.11.020

Abstract

Abstract: 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.

Key words: WC/Fe surface composite, 45 steel, interfacial microstructure, casting, numerical simulation

CLC Number:

TG174.4

Zhang Zhanzhan, Ning Jiaqing, Zuo Lingli, Liao Haiyang. Effect of process parameters on interfacial microstructure of WC particle reinforced surface composite and steel substrate[J]. Heat Treatment of Metals, 2021, 46(11): 131-136.

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