Effects of Laser Surface Remelting on Microstructure and Friction and Wear Properties of FeCoCrNiMo_0.75 High-Entropy Alloy AITranslate

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Chinese Library Classification Number:TG139[一般工业技术—材料科学与工程];TG665[金属学及工艺—合金]

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FeCoCrNiMo_0.75 high-entropy alloys prepared by vacuum arc melting were subjected to laser sur-face remelting modification treatment.The effects of different laser powers(300~1500 W)on the remel-ted microstructure,hardness,and friction and wear properties of FeCoCrNiMo_0.75 alloy were investigated using XRD,SEM-EDS,a microhardness tester,and a reciprocating friction and wear tester.The results show that the thickness of the remelted layer increases with increasing laser power.The microstructure of the alloy without remelting treatment is mainly composed of FCC,σphase andμphase.After remelting at low power(300~600 W),the phase composition does not change significantly.When the laser power is in-creased to 900~1500 W,theμphase in the remelted microstructure disappears.Laser remelting can signi-ficantly refine the eutectic microstructure of the alloy and improve its surface hardness and friction and wear properties.Among them,FeCoCrNiMo_0.75 high-entropy alloy remelted at 600 W laser power has the optimal comprehensive performance,with the highest average hardness of the remelted layer(573 HV_0.2).In addition,its friction coefficient,surface roughness,and volumetric wear rate are all the lowest,and the volumetric wear rate is reduced by 85.5%compared with the alloy without remelting.In terms of wear mechanisms,the room-temperature wear mechanism of the alloy without remelting is mainly abrasive wear and fatigue wear.However,after the alloy is subjected to laser surface remelting treatment,its wear mecha-nism is mainly abrasive wear.