Experimental investigation into the evolution of microstructure and nanomechanical characterization of electric discharge deposited surface layers on Ti64. (31st March 2023)

• Record Type: Journal Article
• Authors: Jaiswal, Shubham; Kuriachen, Basil; Mathew, Jose
• Is Part Of: Measurement. Volume 210(2023)
• Publication Date: 2023-03-31
• Subjects: Ti-6Al-4V -- Nanoindentation -- Electric discharge -- Microstructure -- Surface crack density -- Deposited layer; Weights and measures -- Periodicals; Measurement -- Periodicals; Measurement; Weights and measures; Periodicals; 530.8
• DOI: 10.1016/j.measurement.2023.112544
• Languages: English
• ISSNs: 0263-2241

Abstract

Highlights: The impact of electrical discharge alloying on the microstructure and nano-mechanical characteristics are presented. The deposited layer on Ti6Al4V showed the presence of Titanium Carbide and twice the hardness of the base material. The thickness of the deposited layer is influenced by the current and pulsed ON time. The deposited layer consists of dendritic, columnar, and spike like dendritic structure. Abstract: In the current study, Ti64′s surface has been transformed by electric discharge machining, and its microstructure, surface crack density, layer composition, and nanomechanical properties are examined, as well as the effects of peak current and pulse on time. The studies were carried out using a two-factor, three-level full factorial design. On the deposited layer, OM, XRD, EDS, SEM, and nanoindentation tests were performed. According to the variation in the process parameters, it was discovered that the deposited layer is not uniform and has a thickness range of 45–182 μm. Additionally, it has a dual microstructure that is both equiaxed and dendritic. Carbon deposition (up to 70% by weight), and carbide formation were all found to increase with parameter values. It is discovered that the layer's hardness is twice (718HV) as compared to the base material. Additionally, a minor modification in reduced modulus has been noted. SCD and crack width were discovered to be rising as parameter level rose.