Effect Of Magnetic Controlling Parameters On Microstructure And Mechanical Property Of The Surfacing ZY-YD101N-S Alloy Layer

At the background of remanufacturing engineering, the serious problem of wear on roll was studied by preparing ZY-YD101N-S layer on Q235B steel. The longitudinal alternating magnetic field was applied on the submerged arc welding by orthogonal experiment method for the ZY-YD101N-S alloy layer. The microstructure phase compositions, formation mechanism of the surfacing layer is studied with relevant performance measurement and modern material analysis methods. The effect of magnetic field parameters on the microstructure and property is analyzed. Concluded as follows:ZY-101N-S alloy layer is obtained by applying longitudinal alternative magnetic field with surfacing ZY-101N-S alloy on Q235B low carbon steel, which has a good metallurgical bonding property. And the hardness of the surfacing layer get improved comparing with non-magnetic. The impacts of magnetic field parameters on the hardness is that the effect of hardness is obvious dependent on its peak current, and frequency, the base current has no effect. When the peak current is280A, the base current is100A, magnetic field frequency is20Hz, the hardness and the corrosion resistant of surfacing layer was improved most obviously. With the effect of magnetic field, the corrosion rate reduced from319.20g/(m2·h) to76.36g/(m2·h). It was concluded that the phase compositions of the microstructure are α-Fe,(CR, Fe)7C3,(Cr, Fe)2C,(Mn, Fe)3C, Cr3Si and Cr3Ni2. The phase compositions is irrelevant to magnetic field. The rod-like M2C and flaky M7C3phases distribute along martensite matrix radial direction. A spot of granular nonmetallic compound, like MO2and M2O3, are also existed.With additional longitudinal alternating magnetic field, the electromagnetic stirring on the molten pool urges grain refinement. Crystal microstrain is initiated alternative electromagnetic field, the substructure is increased, martensitic transformation is promoted and then hardness of surfacing alloy is promoting. The main reason of corrosion resistant property improving is that the element of surfacing alloy is equality and grain is refined. The macro-stress and micro-stress of alloy layer of addition magnetic field are increased than non-magnetic. In this experimental condition, macro-stress and micro-stress of surfacing alloy increase following the rising of peak current and base current. Primary caused:microstructure refinement reduces the thermal conductivity of surfacing alloy, helpful to the thermal stress increased. Because of magnetic field, the strain energy is increasing, and then improving the internal stress.