摘要
为了提高快速成形零件的服役性能,采用机器人脉冲熔化极气体保护焊工艺在H08Mn2Si堆积材料表面制备了耐磨涂层。利用扫描电镜(SEM)、能谱分析仪(EDS)观察分析了基体和涂层的组织形貌,在纳米硬度计上测试了基体–过渡区–涂层的硬度变化,采用T11摩擦磨损试验机考察了油润滑条件下基体和涂层的摩擦学性能。试验结果表明,熔覆涂层与快速成形堆积基体材料呈冶金结合,无孔洞、裂纹出现,沿基体–涂层方向随着距离的增大材料显微硬度呈增大趋势。熔覆涂层的摩擦因数低于快速成形堆积基体材料,磨损过程也更平稳,相对耐磨性是快速成形堆积基体的5.91倍。这主要是由于熔覆涂层基体硬度较高且有M7C3等硬质相形成所致。
In order to improve property of parts manufactured by layer deposited processing, wear–resistant coating by robotic gas metal arc welding–pulse processing （GMAW–P） are prepared on test sample accumulated with H08Mn2Si welding wire. The microstructures, hardness, wear–resisting property of cladding layer are analyzed by scanning electron–microscope, nano–hardness tester and T11 high temperature–wear testing machine. The results show that metallurgical bonding between laser–cladding layer and substrate deposited with H08Mn2Si, there are no cracks in the cladding coatings. With the increase of distance, the micro hardness increases along substrate–cladding coating direction. The friction coefficient of coatings is lower and wear process of the coatings is more stable than those of parent material by rapid prototyping under oil lubricating. The reasons of higher matrix hardness of coating and some hard phases among coatings such as M7C3 among coatings make the wear resistance of cladding coating is 5.91 times that of the substrate deposited with H08Mn2Si.
出处
《中国表面工程》
EI
CAS
CSCD
北大核心
2010年第2期69-73,共5页
China Surface Engineering
基金
国家自然基金项目(50975286)
国防科技重点实验室基金(No9140C8502050806)
国防基金项目(No9140C8502050806)
