| Molten aluminum is very corrosive.During the process of aluminum alloy smelting,hot-dip aluminum plating and aluminum alloy products,parts such as molds,crucibles,etc.that are in direct contact with the molten aluminum will be subject to the interaction of corrosion and wear of molten aluminum and are easily damaged.This will cause problems such as aluminum liquid pollution,product quality decline,production cost increase,and efficiency decrease.Therefore,the development of a new type of corrosion-wear resistant materials in molten aluminum is an urgent need.Fe-Cr-B alloy is a very promising material for corrosion-wear of molten aluminum.The boride in the alloy has excellent resistance to corrosion-wear resistance of liquid aluminum.The toughness of the material is poor,making it difficult to apply to actual production.However the network distribution of boride cuts the matrix,resulting in poor toughness of the material,so it is difficult to apply to actual production.Rare earth modification and alloying can improve the morphology of boride,but there are few reports about the effect of modification and alloying on the corrosion-wear resistance of Fe-Cr-B alloy.This paper takes Fe-Cr-B alloy as the research object,by adding and adjusting the content of Ce,W and B elements,the structure,mechanical properties,resistance to molten aluminum corrosion and corrosion-wear of the above elements on Fe-Cr-B alloy are studied.The main research conclusions are as follows:?1?Fe-Cr-B alloy can achieve good impact toughness through Ce modification and a small amount of W addition.The impact toughness of M5?Fe-15.0Cr-1.4B-1.0W-0.6Ce?is 2.9times higher than that of M1?Fe-15.0Cr-1.3 B?.The addition of Ce can desulfurize and deoxidize and purify the grain boundaries,while W can improve the toughness of the boride,and the combination of the two can gradually reduce the continuity and size of the boride in the alloy,and the distribution of boride is more uniform Improve the impact toughness of the alloy.In addition,The rockwell hardness and compressive strength of the material increases with the increase of W and B content,but the plasticity gradually decreases.?2?M2B boride has excellent corrosion resistance to molten aluminum,and the volume,shape and distribution of boride will affect the corrosion resistance of molten aluminum.M10?Fe-15.0Cr-3.9B-4.9W-0.6Ce?has the best corrosion resistance to molten aluminum,about 5.3times that of H13 steel.The increase of B content can increase the volume fraction of boride in the alloy,and form a larger size of boride to block the corrosion of the molten aluminum,delay the peeling of the IMC,and then improve the corrosion resistance of the material to molten aluminum.M5 has the best comprehensive performance of toughness and corrosion resistance of molten aluminum.The addition of Ce and W makes the distribution of boride in the matrix more uniform.While improving toughness,it can also delay the corrosion of molten aluminum and protect the matrix.?3?Fe-Cr-B alloys with different compositions all have excellent resistance to corrosion-wear of molten aluminum.M10 has the best corrosion-wear resistance to molten aluminum,about 2.9 times higher than that of H13.M5 has the best comprehensive performance of toughness and corrosion-wear resistance of molten aluminum.The corrosion-wear loss of the alloys in molten aluminum is much higher than the sum of its weight loss under pure corrosion and pure wear,In the corrosion-wear process of materials,corrosion and wear have a mutually promoting effect,and the interaction between corrosion and wear is the main reason for the failure of Fe-Cr-B alloy. |
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