为了探究激光熔覆对高速车轮钢合金涂层摩擦与磨损性能的影响,利用LDM2500-60型半导体全固态激光器在高速车轮钢表面激光熔覆制备Fe基合金涂层.分别采用金相显微镜、能量色散X射线光谱仪、X射线衍射仪(XRD)分析了熔覆涂层的组织结构、元素分布以及物相,利用MM-2000高速摩擦试验机研究了高速车轮材料激光熔覆处理前后轮轨材料的摩擦磨损性能.结果表明:激光熔覆处理能有效改善车轮材料的抗磨损性能,熔覆涂层主要由γ-Fe、Cr7C3碳化物以及含铁固溶体等物相组成,涂层组织主要以树枝晶和共晶为主;车轮合金涂层的磨损速率相比基体材料降低了51％左右,车轮熔覆铁基合金后的轮轨磨损机制主要表现为轻微的磨粒磨损和氧化磨损.
Fe-based alloy coating on laser cladding high-speed wheel steel was obtained by a semiconductor all solid-state laser of LDM250060 device,and the microstructure,element distribution and phase composition of the coating were measured by a metallographic microscope,energy dispersive X-ray spectroscopy and X-ray diffraction (XRD).The friction and wear performance of coating,wheel substrate and mapped rail material were evaluated by a MM-2000 high-speed friction tester.Results showed that the wear resistance of the wheel material could be effectively improved by laser cladding treatment.The cladding coating was mainly composed of γ-Fe,Cr7 C3 carbide and iron-containing solid solution.The composition organization was mainly formed with dendrites and eutectic crystallizations.Moreover,the average wear rate of cladding coating of wheel mnaterial was reduced by 51％,and after modified with laser cladding Fe-based alloy coating,the wear mechanism of wheel/rail mainly belonged to mild abrasive wear and oxidation wear.
参考文献
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%