Tribological properties of overlap and non-overlap zones in laser-clad iron-based coatings
WU Ying1,2, LIU Yan1, CHEN Wenjing3, CHEN Hui1
1. School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China; 2. Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China; 3. School of Materials Science and Engineering, Xihua University, Chengdu 610039, China
Abstract：The microstructures of multi-pass laser cladding coatings exhibit periodic changes that are generally divided into overlap and non-overlap zones. The tribological properties of these two zones were studied using linear reciprocating friction tests with forces of 5 and 25 N and friction times of 150 and 300 s. This study analyzed the tribological characteristics with analyses of the microstructures and phases in the two zones. The results show the relationship between the tribological effects and the microstructure and the evolution of the microstructure during the friction process. The results show that at low pressures, the anti-wear characteristics are greatly affected by the microstructure. The overlap zone has poor wear resistance due to the coarse microstructure and less α-Fe content while the non-overlap zone with a finer microstructure and high α-Fe content has better wear resistance. At high pressures, the wear characteristics are less affected by the microstructure with the anti-wear characteristics of the overlap zone being similar to those of the non-overlap zone. The subsurface below the wear scar had a shear deformation layer after the friction test whose thickness, hardness and equivalent strain increased with increasing pressure and friction time. The overlap zone hardness increases faster than that of the non-overlap zone.
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2022, Vol. 62 
