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| Effect of microstructure on properties of roll surfacing |
| LIU Lu, GUO Jian, ZHAO Guang, LI Bo, ZHAO Jianglin, HAN Peng |
| Technology Center, HBIS Group Tangsteel Company, Tangshan 063011, China |
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Abstract The service life of roll surfacing layer is closely related to the surface hardness and quality of surfacing alloy, while the surface hardness is closely related to the microstructure of the surfacing alloy. The surfacing alloy was prepared on 45 # steel substrate by the submerged arc surfacing technology using high-chromium molybdenum flux cored wire as the surfacing welding material. The alloy layer deposited by 420L welding wire had the dendritic structure composed of Fe-Cr solid solution and carbide, while the alloy layer deposited by YD255Mo-S welding wire was mainly composed of the mixture of black acicular martensite and residual austenite. The average microhardness HV0.2 of alloy layers deposited by two kinds of welding wires was 620 and 634.6, respectively. The maximum error was 11.9% and 9.1%, respectively. The overall average hardness value of alloy layer welded with YD255Mo-S wire was high with little fluctuation. The relationship between the microstructure characteristics of surfacing alloy formed under two grades of welding wire and the surface hardness of the alloy was studied.
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Received: 22 July 2022
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2023, Vol. 41 
