摘要
采用光学显微镜、扫描电镜(SEM)、X射线衍射(XRD)以及磨损实验,研究了添加1%(质量分数)Y2O3对等离子喷焊高铬铸铁型铁基合金涂层组织和耐磨性的影响。结果表明,加入1%Y2O3并未改变涂层中相的组成,主要都是由面心立方的γ(Fe、Ni)固溶体和六方结构的M7C3型碳化物构成,但使γ(Fe、Ni)固溶体生长晶面由{002}转变为以{111}和{002}晶面为主。由于涂层中Y2O3的加入,稀土氧化物颗粒可作为异质形核核心,细化组织,并抑制碳化物的生长,使其弥散分布于共晶组织中,从而提高喷焊层的显微硬度和耐磨性能。
High chromium iron based coatings with and without 1% Y203 were produced by plasma arc cladding process on a low carbon steel. Microstrueture and tribologieal characteristics of the coatings were studied using optical microscope, seanning electron microscopy, X-ray diffraction and wear test. The results show that the high chromium iron based coating is composed of γ-（FeNi） solid solution with face-centered cubic lattice and M7 C3 （ M = Cr, Fe, Mo） carbides with hexagonal lattice structure. The Y2 03 in the Fe-based coating doesn＇ t change the coating＇ s phase composition, but it changes the crystal growth direction of γ-（ Fe, Ni）solid solution from almost single{002} to both {111}and {0021. The rare earth oxide Y2 03 not only acts as the heterogeneous nucleation to refine the microstructure but also restrains the growth of the carbides. Additionally, it improves the microhardness and wear resistance of the coating by making the refined carbide particles dispersively distribute in the coating matrix.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2013年第6期153-157,共5页
Transactions of Materials and Heat Treatment
关键词
等离子喷焊
铁基合金
稀土氧化物
耐磨性
plasma cladding
Fe-based alloy
rare earth oxide
wear resistance
