超声深滚法提高电弧喷涂3Cr13涂层性能

Improvement of the Properties of Electric Arc Spray 3Cr13 Coating by Ultrasonic Deep Rolling Method

利用超声深滚(Ultrasonic deeprolling,UDR)技术对钢基体电弧喷涂3Cr13涂层进行表面复合强化处理,旨在改善涂层的综合性能。采用扫描电镜、应力仪及球—盘式摩擦磨损试验机等设备检测和分析UDR工艺对该涂层孔隙率、表面粗糙度、残余应力、显微硬度、摩擦学性能等的影响。结果表明,UDR工艺使该涂层的孔隙率从5.1%降为2.3%;表面粗糙度Ra由40μm以上降为2.4μm;表面残余压应力由8MPa提高到257MPa;涂层显微硬度提高约45%,涂层摩擦学性能得到了明显提高。且Bragg衍射峰明显宽化、左移、峰强增大,这表明涂层晶粒明显细化、晶格畸变,且形成晶向平行表面的板织构。同时分析和讨论UDR工艺对提高3Cr13涂层性能的影响机理。

Ultrasonic deep rolling（UDR） technique is applied to treating electric arc spray 3Cr13 coating to improve its overall properties.The influence of UDR treatment on coating porosity,surface roughness,residual stresses,microhardness,inherent strength and tribological property of the coating is investigated by using scanning electron microscope,X-Ray stress instrument,ball-on-disc friction and wear tester,etc.Results of the tests show the distinct improvement on the overall properties of the UDR treated coating：The porosity decreases from 5.1% to 2.3%,surface roughness decreases from more than 40 μm to 2.4 μm,surface compressive residual stresses increases from 8 MPa to 257 MPa,microhardness increases about 45% and wear resistance increases obviously.The X-ray diffraction experimental results show that the peak of Bragg diffraction pattern is broadened evidently and the intensity of the peak also increases evidently as a result of UDR treatment,which indicates the refinement of coating grain and the distortion of lattice,and the formation of a sheet texture surface with parallel lattice orientation.At the same time,the effect mechanism of UDR treatment on the properties of the coating is discussed and analyzed.