高速电弧喷涂FeNiCrBSiNbW非晶涂层组织结构与力学性能对热处理温度的响应?

Fe 基非晶涂层因较高的性价比、良好的耐蚀性而广泛应用于众多工业领域,但其在高温环境下的使役性能会因微观结构的变化而发生改变。 为了探讨 Fe 基非晶涂层组织结构与力学性能对热处理温度的响应,利用高速电弧喷涂技术制备 FeNiCrBSiNbW 非晶涂层,随后对其进行不同温度热处理,获得三种具有不同组织结构的涂层。 采用 X 射线衍射仪、扫描电子显微镜、能谱仪、差示扫描量热仪、电子万能试验机、显微硬度计、纳米压痕仪对不同热处理温度下涂层的组织结构和力学性能进行表征。 结果表明:FeNiCrBSiNbW 涂层中非晶相的晶化过程包括初晶晶化与共晶晶化;随着热处理温度的升高,涂层的非晶相含量、孔隙率、结合强度与断裂韧性逐渐降低,而涂层的硬度与弹性模量不断增大。 研究成果对调控高速电弧喷涂 Fe 基非晶涂层的组织结构与力学性能有一定的指导意义。

Response of Microstructure and Mechanical Property of High Velocity Wire Arc Sprayed FeNiCrBSiNbW Amorphous Coating to Annealing Temperature

Fe-based amorphous coating is widely used due to its cost-effective and good corrosion resistance, but its high temperature performance is affected by the variation of the microstructure. In order to investigate the response of microstructure and mechanical property of Fe-based amorphous coating to annealing temperature, FeNiCrBSiNbW amorphous coatings are prepared by high velocity wire arc spraying, and then three coatings with different microstructures are obtained by annealing treatment at different temperatures. Microstructure and mechanical property of the as-sprayed and annealed FeNiCrBSiNbW coatings are characterized by means of XRD, SEM, EDS, DSC, electronic universal testing machine, microhardness tester and nanoidenter. The results show that the crystallization process of amorphous phase in FeNiCrBSiNbW coating includes primary crystallization and eutecticum crystallization. With increasing annealing temperature, the FeNiCrBSiNbW coatings show reductions in amorphous content, porosity, bond strength and fracture toughness, and increase in hardness and elasticity modulus. The research result has a guiding significance to regulate the microstructure and mechanical property of arc-sprayed Fe-based amorphous coating.