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2015•Journal of Zhongyuan University of TechnologyRequires access

Microstructure of Fe-based Alloy Coating by Plasma Cladding Process on Q345

Zhao Lon

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Abstract

By plasma cladding technology and with appropriate processing parameter,Fe-based alloy powder Fe-Ni-Cr-B-Si and Fe-Cr-B-Si were melt on the Q345,then a wear-resistant coating metallurgically bonded on the substrate was prepared.The microstructure of clad layer was investigated by optical microscope(OM),scanning electron microscopy(SEM)and X-ray diffractometer(XRD).The microhardness distribution of the clad layer was tested by microhardness tester.The results show that the microstructure of Fe-Ni-Cr-B-Si clad layer is mostly lathlikeγ-Fe,however the one of Fe-Cr-B-Si clad layer is mostly cell-like crystal,and the local area is reticulated eutectic crystal.The clad layer's microhardness can reach 500~570HV0.2.And the microstructure of the heat-affected zone of the substrate is martensite and pearlite.

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What this paper is about

By plasma cladding technology and with appropriate processing parameter,Fe-based alloy powder Fe-Ni-Cr-B-Si and Fe-Cr-B-Si were melt on the Q345,then a wear-resistant coating metallurgically bonded on the substrate was prepared.The microstructure of clad layer was investigated by optical microscope(OM),scanning electron microscopy(SEM)and X-ray diffractometer(XRD).The microhardness distribution of the clad layer was tested by microhardness tester.The results show that the microstructure of Fe-Ni-Cr-B-Si clad layer is mostly lathlikeγ-Fe,however the one of Fe-Cr-B-Si clad layer is mostly cell-like crystal,and the local area is reticulated eutectic crystal.The clad layer's microhardness can reach 500~570HV0.2.And the microstructure of the heat-affected zone of the substrate is martensite and pearlite.

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Available abstract

By plasma cladding technology and with appropriate processing parameter,Fe-based alloy powder Fe-Ni-Cr-B-Si and Fe-Cr-B-Si were melt on the Q345,then a wear-resistant coating metallurgically bonded on the substrate was prepared.The microstructure of clad layer was investigated by optical microscope(OM),scanning electron microscopy(SEM)and X-ray diffractometer(XRD).The microhardness distribution of the clad layer was tested by microhardness tester.The results show that the microstructure of Fe-Ni-Cr-B-Si clad layer is mostly lathlikeγ-Fe,however the one of Fe-Cr-B-Si clad layer is mostly cell-like crystal,and the local area is reticulated eutectic crystal.The clad layer's microhardness can reach 500~570HV0.2.And the microstructure of the heat-affected zone of the substrate is martensite and pearlite.

Key concepts: Microstructure, Materials science, Indentation hardness, Eutectic system, Diffractometer, Scanning electron microscope, Optical microscope, Alloy

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