DePalma K, Walluk M, Martin L P, Sisak K
Golisano Institute for Sustainability, Rochester Institute of Technology, Rochester, NY USA.
J Therm Spray Technol. 2022;31(1-2):315-328. doi: 10.1007/s11666-021-01304-w. Epub 2022 Jan 3.
Twin wire arc is a commonly used thermal spray technology for application of steel coatings to cast iron components. Hardness and adhesion strength are critical properties of such coatings, and significant research is available reporting these properties. However, the lamellar structure of the coatings and residual stresses induced during the coating process leads to significantly different behavior in bending applications than in purely tensile applications which are evaluated by the standard adhesion test. In addition, microstructural features that are controlled by certain process parameters during deposition of the coating can have a significant effect on these properties. This work relates the hardness, adhesion strength, and wear resistance to the coating microstructure and assesses the related bending strength and failure mode. Comparisons between bend tests and pull-off adhesion tests show significant differences to consider when designing a twin wire arc coating.
双丝电弧是一种常用于在铸铁部件上施加钢涂层的热喷涂技术。硬度和附着力是此类涂层的关键性能，已有大量研究报道了这些性能。然而，涂层的层状结构以及涂层过程中产生的残余应力导致其在弯曲应用中的行为与通过标准附着力测试评估的纯拉伸应用中的行为有显著不同。此外，涂层沉积过程中某些工艺参数控制的微观结构特征会对这些性能产生重大影响。这项工作将硬度、附着力和耐磨性与涂层微观结构相关联，并评估相关的弯曲强度和失效模式。弯曲试验和拉脱附着力试验之间的比较表明，在设计双丝电弧涂层时需要考虑显著差异。
