超聲表面滾壓處理對(duì)45鋼摩擦學(xué)性能的影響及機(jī)理

超聲表面滾壓處理對(duì)45鋼摩擦學(xué)性能的影響及機(jī)理Influence of Ultrasonic Surface Rolling Processing on Tribological Performance of 45 Steel and Its Mechanism

采用超聲表面滾壓處理（USRP）技術(shù)對(duì)45鋼表面進(jìn)行強(qiáng)化處理，通過表面形貌和表層顯微組織觀察、表面粗糙度和摩擦磨損性能測(cè)試，研究了USRP對(duì)該鋼摩擦學(xué)性能的影響及機(jī)理。結(jié)果表明：USRP試樣的表面粗糙度由未處理試樣的3.2 μm降低到0.23 μm；顯微組織得到了細(xì)化，晶粒取向趨于隨機(jī)分布，有大角度晶界出現(xiàn)；表面顯微硬度比未處理試樣的提高約56%，強(qiáng)化層厚度達(dá)到400 μm；USRP試樣的摩擦因數(shù)小于未處理試樣的，磨損量為未處理試樣的1/4；未處理試樣磨損過程中表面材料呈“片塊狀”脫落，磨損機(jī)制為黏著磨損，USRP試樣磨損表面上存在犁皺形成的溝槽，磨損機(jī)制為磨粒磨損。

The surface strengthening of 45 steel was carried out by the ultrasonic surface rolling processing (USRP) technique. Then the influence of USRP on the tribological performance of the steel and the mechanism were studied by means of the surface morphology and surface microstructure observation, surface roughness and friction and wear performance tests. The results show that the surface roughness of the USRP specimen decreased from 3.2 μm of the untreated specimen to 0.23 μm; the microstructure was refined, the grain orientation tended to be randomly distributed and the high-angle grain boundary was observed; the microhardness at the surface was about 56% higher than that of the untreated specimen, and the thickness of the strengthening layer was up to 400 μm; the friction coefficient of the USRP specimen was lower than that of the untreated specimen and the wear loss was 1/4 of the untreated specimen. The surface materials of the untreated specimen showed a piece-like peeling during the wear process with the wear mechanism of adhesive wear. While on the wear surface of USRP specimen, the ploughing formed grooves were observed and the wear mechanism was abrasive wear.

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