Growth Mechanism of Micro-Arc Spark Deposited Stellite Alloy Coatings

Abstract:

Micro-arc spark deposition with Stellite6 alloy as the coating material on SCH13 steel substrates was carried out using high-energy micro-arc process with different processing parameters. The microstructure, chemical compositions and phase identification of the deposition layers were examined by using scanning electron microscopy (SEM), energy dispersive Xray spectroscopy (EDS) and X-ray diffraction (XRD), respectively. Meanwhile the form and growth mechanism of a single pulse deposit were focused on. The results show that the morphology of the single pulse deposit is splashshape. A large number of single pulse deposits deposited and superimposed continuously and then deposition layers with a certain thickness were formed. The epitaxial growth coating with columnar grains was then achieved by the micro-arc spark deposition. The prepared Stellite6 alloy coating has a good metallurgical combination with the SCH13 steel substrate and the elements at the interface are smooth transition. Because of the effects of the temperature gradient and the solidification rate, the microstructure of the deposition layer is slightly coarser with the increasing of the processing voltage. The coatings are consisted of γ-Co solid solution and chromium carbides.

• Periodical: Applied Mechanics and Materials (Volume 455)
• Pages: 83-87
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.455.83
• Online since: November 2013
• Authors: Chun Hua Zhang, Chao Wang, Song Zhang, Ming Sheng Wang, Yu Jiang Xie, Jun Zhe Tan
• Keywords: Directional Epitaxial Growth, Micro-Arc Spark Deposition, Stellite 6 Alloy

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