Microstructure And Wear Properties Of WC/Grey Cast Iron Matrix Surface Composite Performed By In-situ

In this paper, WC / Fe surface composite materials successfully prepared with the method of combining casting with heat treatment process. And then we used the X-ray diffraction and scanning electron microscopy to study the Phase composition and microstructure of the composite materials in different holding time, used micro-hardness tester testing the longitudinal cross-section micro-hardness composite patterns under different heat preservation time, at the same time, we used pin tray with a dry abrasive wear tester composite samples of two-body wear test under different loading, As well as one-way experiment scratch in the surface of the composite model,Studied the wear properties and wear mechanism of the composite. The following major Conclusion:(1) At different incubation time, the composite surface has a dense tungsten carbide ceramic layer, after holding 8h reaction layer thickness reached to 148?m, and with the increase of holding time, the thickness of the ceramic layer is gradually increasing and becoming more and more compact;(2) In the WC / Fe Surface Composites two-body abrasion test, with the loading increases, the composite surface damage is more severe, reducing the relative wear resistance is at the first increases and then down; for WC composite materials under the same load but different volume fraction, we found that with the volume fraction's increasing, it has better wear resistance, When the WC samples' volume fraction reached to about 90%, the study showed that combine with gray cast iron, the relative wear resistance is 89.8;(3) A longitudinal section of the composite samples micro-hardness, micro-hardness in multiple districts reach to 1431HV0.1, It's about 5.2 times of gray cast iron matrix;(4) In the dense layer one-way scratch test, when the load from 0N to 120 N process, the ceramic layer surface groove depth increases, the deepest trench depth of 15?m, during sliding crack initiation first generate in the bottom of the trench, after is micro-cracks, tiny cracks intensive, small and medium mixing until it evolved into a crack through the cracks.