目的 提升42CrMo合金钢摩擦副表面的摩擦学性能。方法 采用激光织构技术在试件表面加工不同面密度的三角织构,以环氧树脂E51为衬垫,将纳米颗粒MoS2与E51环氧树脂按1∶2比例混合后填充至织构内部,进行摩擦磨损试试验。在不同工况条件下,研究织构不同面积占比的摩擦学性能,并利用SEM扫描电镜和EDS元素能谱分析仪对试样表面磨痕进行表征。最后,通过应力仿真分析不同织构密度的等效应力大小及分布规律。结果 与未织构表面相比,纯织构表面的摩擦系数在一定程度上降低,从约0.8降至0.6左右;微织构与MoS2纳米颗粒结合形成的复合润滑结构的摩擦学性能明显优于未织构表面和纯织构表面。当织构凹坑面积占有率为16%时,复合润滑结构的摩擦系数最低,约为0.19;随着织构密度的增加,复合润滑结构的摩擦系数逐渐上升,当织构密度达到36%时,摩擦系数达到最大值,约为0.3。密度为16%的织构表面等效应力峰值为3.553 8 MPa,随着织构密度的增加,等效应力峰值呈现先增大后减小的趋势。结论 表面微织构与填充的MoS2纳米颗粒的协同作用,显著改善了42CrMo合金钢表面的摩擦学性能。MoS2纳米颗粒在摩擦副表面形成固体润滑膜,而微织构能够捕获磨屑并储存润滑剂,为破损的润滑膜提供补充,从而实现减摩抗磨的效果。
Abstract
42CrMo, widely utilized in gears, bearings, connecting rods, and other automotive components, demonstrates significant potential for enhancing wear resistance and friction reduction performance. The work aims to introduce a composite surface modification technique combining laser processing surface weaving technology with solid lubricants to improve friction reduction and wear resistance without altering the base material.
Rectangular blocks of 40 mm × 40 mm × 8 mm were cut from 42CrMo and polished with the sandpaper of varying grits before being cleaned in an ultrasonic cleaner. Laser weaving technology was employed to create triangular structures with surface densities of 16%, 26%, and 36% on the specimen surfaces. A viscous composite lubricant, prepared by mixing MoS2 and epoxy resin E-51 at a 1∶2 volume ratio, was applied with a dust-free cloth and uniformly filled into the microstructures. Excess lubricant was removed by grinding and polishing with the sandpaper, and the blocks were subsequently heated and fixed to prepare friction wear specimens. The composite surface morphology was examined with a metallurgical microscope. Friction and wear experiments were conducted on an MRTR-1 multifunctional tester under dry friction conditions for 20 minutes, with data acquisition at 0.1-second intervals, a load of 20 N, and a rotational speed of 200 r/min. SEM and EDS analyses were performed to examine wear marks and elemental compositions, while stress simulation was used to investigate equivalent stress magnitudes and distributions for different weave densities and friction-wear patterns.
Compared to textured surfaces, composite surfaces with varying texture densities exhibited differing levels of friction reduction. The composite surface with a texture density of 16% demonstrated the most effective friction reduction, achieving a friction coefficient of approximately 0.19 and a friction reduction rate of 77.65%. The friction coefficient increased with fabric density. The peak equivalent stress for the 16% density surface was 3.553 8 MPa, showing an initial increase followed by a decrease as fabric density continued to rise.
Processing surface microstructures and incorporating MoS2 nanoparticles significantly enhance the tribological properties of 42CrMo alloy steel. Both the microstructures and the MoS2 nanoparticles contribute to a synergistic lubrication effect. The nanoparticles form a solid lubrication film on the friction surface, while the microstructures capture abrasive debris and store lubricants to replenish the lubrication film when it breaks. This mechanism effectively reduces friction and wear. Additionally, the stored lubricant supplements the broken lubrication film, achieving the dual goals of friction reduction and wear resistance.
关键词
42CrMo合金钢 /
激光织构技术 /
复合润滑结构 /
MoS2 /
织构密度 /
摩擦学性能
Key words
42CrMo alloy steel /
laser texture technology /
composite lubrication structure /
MoS2 /
texture density /
tribological property
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基金
云南省教育厅面上项目（2022J0499）;云南省DongyangLi院士工作站（202305AF150019）;国家自然科学基金（51865053）
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