Hadfield Steel Matrix Composite Reinforced by Oriented High Cr Cast Iron Bar
Hadfield steel matrix composite reinforced by oriented high Cr cast iron bar was prepared by inserting high-Cr alloys flux-cored welding wires into hadfield molten.The microstructure and mechanical properties of the composite were carried out by optical microscope,electric scanning microscope,XRD,microhardness and three-body abrasion wear tester.The results show that the water quenched composite is composed of oriented high-Cr cast iron bars reinforcements and austenite hadfield matrix,the reinforcements consist of austenite dendrites,eutectic cells of M7C3 carbides and residual austenite phases.The microhardness of the reinforcements is 1100～1280 HV0.1,which is 4～5 times higher than that of hadfield steel matrix.Compared with the as-cast composite and hadfield steel,the water quenched composite possesses great wear-resistant behavior.