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高速电弧喷涂再制造曲轴的使用寿命与涂层的结合强度和耐磨性有很大的关系。为了提高涂层的性能,研究了新型FeAlCr/3Cr13复合涂层的组织结构和力学性能,采用扫描电镜(SEM)、能谱仪(EDAX)和X射线衍射仪分析了涂层的微观结构、相组成和残余应力。利用显微硬度计和CETR微动摩擦磨损试验机等试验设备对涂层的力学性能进行了分析。结果表明,喷涂FeAlCr粉芯丝材作为打底层,合金元素反应充分,复合涂层组织均匀、致密,空隙率约9.87%。复合涂层相组成主要由韧性相α-Fe和硬质相Cr23C6、(Fe,Cr)固溶体组成,氧化物含量较低,约3.2%,复合涂层平均残余应力较小,约67.6 MPa,平均显微硬度HV0.1为4000 MPa,结合强度约46.6 MPa,油润滑高载摩擦条件下复合涂层表现出较好的耐磨性能。
The service life of high speed arc spray remanufacturing crankshafts is strongly related to the bond strength and wear resistance of the coating. In order to improve the performance of the coating, the microstructure and mechanical properties of the new FeAlCr / 3Cr13 composite coating were studied. The microstructure, phase and morphology of the coating were analyzed by SEM, EDAX and XRD. Composition and residual stress. The mechanical properties of the coatings were analyzed by using microhardness tester and CETR fretting friction and wear testing machine. The results showed that FeAlCr powder core wire was sprayed as the primer layer and the alloying elements reacted well. The composite coating was uniform and dense with a porosity of about 9.87%. The phase composition of the composite coating is mainly composed of α-Fe tough phase and Cr23C6, (Fe, Cr) solid solution with relatively low oxide content of about 3.2%. The average residual stress of the composite coating is small, about 67.6 MPa. The average The microhardness HV0.1 is 4000 MPa and the bonding strength is about 46.6 MPa. The composite coatings show good wear resistance under the condition of high oil friction and friction.