稀土Ce对激光熔覆高硼贝氏体涂层性能的影响

利用激光熔覆制备了不同Ce含量的高硼贝氏体涂层.采用扫描电镜对不同Ce含量的涂层组织进行表征;利用显微硬度计检测熔覆层显微硬度;通过万能拉伸机测试熔覆涂层的断裂韧性;用往复摩擦磨损试验机测试涂层的磨损性能.结果表明:经稀土Ce改性后,初生奥氏体晶粒尺寸减小,晶间网格状硼化物形态得到改善,呈现断网或颗粒状.三点弯曲断裂韧...

Effect of rare earth Ce on properties of high-boron bainite coating prepared by laser cladding

High boron bainite coatings with different Ce contents were prepared by laser cladding,then the microstructure,microhardness,fracture toughness,wear performance of the costings were studied by using SEM,microhardness tester,universal tensile machine,reciprocating friction and wear tester,respectively.The results show that the grain size of primary austenite decreases,and the morphology of intergranular trellis boride is improved after Ce modification.The three-point bending fracture toughness is improved,and the fracture changes from intergranular brittle fracture to quasi-cleavage fracture.With the increase of Ce content,the average friction coefficient of the coatings decreases first and then increases,and serious fatigue peeling occurs in all the wear marks.