Investigations on the void coalescence and corrosion behaviour of titanium grade 4 sheets during single point incremental forming process

Abstract

Purpose The purpose of this paper is to investigate the void coalescence and corrosion behaviour of titanium Grade 4 sheets during single point incremental forming (SPIF) process with various spindle rotational speeds. The development of corrosion pits in 3.5 (%) NaCl solution has also been studied during SPIF process. Design/methodology/approach In this current research work, the void coalescence analysis and corrosion behaviour of titanium Grade 4 specimens were studied. A potentio-dynamic polarization (PDP) study was conducted to investigate the corrosion behaviour of titanium Grade 4 processed samples with various spindle speeds in 3.5 (%) NaCl solution. The scanning electron microscope and transmission electron microscope analysis was carried out to study the fracture behaviour and corrosion morphology of processed samples. Findings The titanium Grade 4 sheets obtained better formability and corrosion resistance by increasing the CNC spindle rotational speeds. In fact that, the significant plastic deformation affects the corrosion rate with various spindle speeds were recorded. Originality/value The spindle rotational speeds and vertical step depths increases then the titanium Grade 4 sheets showed better formability, void coalescence and corrosion behaviour as the same is evidenced in forming limit diagram and PDP curves.

Investigations on the formability, tensile properties, TEM, 3D-surface roughness and corrosion behaviour on Ti–6Al–4V alloy sheets during single point and multi point incremental forming process

“…Corrosion rate and I corr value of BM reveals poor corrosion resistance as compared with SPIF and MPIF, because of its higher plastic deformation. The rotational shear stress plays major role transmitted to the sheet metals also increases, and it turn which increases the formability and corrosion rate and the same is evidenced (refer Figure 1 and Figure 3) (Yoganjaneyulu et al , 2019).…”

“…Corrosion rate and I corr value of BM reveals poor corrosion resistance as compared with SPIF and MPIF, because of its higher plastic deformation. The rotational shear stress plays major role transmitted to the sheet metals also increases, and it turn which increases the formability and corrosion rate and the same is evidenced (refer Figure 1 and Figure 3) (Yoganjaneyulu et al, 2019). 3.6 Energy-dispersive X-ray spectroscopy analysis of corroded Ti-6Al -4V alloy Figures 3(e)-(f) show the SEM micrograph and elemental composition of Ti-6Al-4V alloy; the PDP test is conducted in 3.5% NaCl solution.…”