摘要
采用激光熔覆技术在Q235A钢表面制备Fe/Cu复合涂层,利用XRD,SEM,TEM和滑动磨损试验等方法研究了Cu对铁基合金激光熔覆涂层的影响.结果表明,未经时效处理的Fe/Cu熔覆层主要是由α-Fe、正交结构的M7C3和M23C6构成.在马氏体上分布着高密度的位错,而且位错沿着熔覆基材向熔覆层方向延伸分布.熔覆层经时效处理后,ε-Cu颗粒沿着M7C3相由过饱和α-Fe中弥散析出,对其周围的位错起钉扎作用.时效后熔覆层的表面耐磨性能显著提高.
The Fe/Cu composite coating was coated on Q235A steel by laser cladding process. The effect of Cu on the microstructure and properties of laser cladded iron-based alloy coating was investigated. It was found that α-Fe phase existed accompanied by the M7C3 with an orthorhombic crystal structure and M23C6 in the cladded coating. The TEM observation showed that the high density dislocations existed in the martensite. The distribution direction of the dislocations existed on the boundary from cladded substrate to cladded coating. The particles of ε-Cu were precipitated dispersedly from the supersaturated α-Fe solid solution along the M7C3 when the cladded coating was aged. They played the role of anchoring dislocation. The wear resistance of coating increased greatly after the aging treatment.
出处
《过程工程学报》
CAS
CSCD
北大核心
2009年第S1期76-80,共5页
The Chinese Journal of Process Engineering
基金
贵州省科学技术基金资助项目(编号:黔科合J字[2007]2179号)
关键词
激光熔覆
铁基合金
铜
组织结构
耐磨性
laser cladding
iron-based alloy
copper
microstructure
wear resistance
