Effect of severe air-blast shot peening on the wear characteristics of CP titanium

Abstract

In this study, air-blast shot peening was applied to analyze the wear characteristics of CP titanium (Grade II). The specimens were exposed to different plastic-deformation rates via different severe shot-peening conditions in order to determine the wear behaviour of CP titanium. A free-ball micro-abrasion test was performed on the specimens shot peened with different Almen intensities. Nanohardness measurements were also performed to investigate the work-hardened layer -the coarse-grainedstructure transition zone. Light microscopy and scanning electron microscopy (SEM) were used to analyze both the wear tracks and the severely deformed layer. As a result, the plastically deformed layer thickness reaches approximately 100 μm beneath the surface. Moreover, the hardness and wear durability after severe shot peening is increased. Keywords: air-blast shot peening, wear, nanoindentation, plastic deformation, ultra-fine-grain durability V tej {tudiji je bilo uporabljeno peskanje z zrakom za {tudij lastnosti pri obrabi CP-titana (Grade II). Vzorci so bili izpostavljeni razli~nim stopnjam deformacije v razli~nih razmerah peskanja, da bi ugotovili vedenje CP-titana pri obrabi. Izvr{en je bil abrazijski preizkus z mikrokroglicami na vzorcih po peskanju z razli~no Almen-intenziteto. Izvr{ene so bile meritve nanotrdote za preiskavo utrjenega sloja in grobozrnate strukture prehodne cone. Za analizo sledov obrabe in mo~no deformiranih slojev sta bili uporabljeni svetlobna in vrsti~na elektronska mikroskopija (SEM). Debelina plasti~no deformiranega sloja dose`e globino okrog 100 μm pod povr{ino. Trdota in odpornost proti obrabi se po mo~nem peskanju pove~ata. Klju~ne besede: hladno kovanje povr{ine s peskanjem z zrakom, obraba, nanoodtisek, plasti~na deformacija, odpornost ultra drobnih zrn

Surface, Subsurface and Tribological Properties of Ti6Al4V Alloy Shot Peened under Different Parameters

“…The fragmentation of both the worn material and the oxide layers can occur during the dry sliding [ 105 , 106 , 107 ], which could behave like hard debris particles during the contact. Thus, the grooves on the worn surfaces may be formed with the three-body abrasion mechanisms caused by the abrasive actions of these hard debris particles [ 22 , 25 , 108 ]. The elemental mappings of Ti, Al, V, and O on the worn surface ( Figure 11 ) indicates the formation of an unstable oxide layer on the wear track.…”

“…Additionally, even a minor surface degradation of Ti alloys caused by contact may trigger catastrophic failure mechanisms such as fatigue and corrosion, which tend to start from previously damaged surface sites. Thus, understanding and improving surface features is vitally important to prevent potential catastrophic failure [ 7 , 22 ].…”

“…Ganesh et al [ 34 ] investigated the wear behavior of shot peened Ti6Al4V alloy and reported that the surface hardening occurred due to shot peening, improving the wear resistance of the alloy. Karaoglanli [ 22 ] investigated the wear performance of commercially pure (CP) Ti alloy shot peened at different Almen intensities and showed that the wear-volume loss was reduced with increasing Almen intensity as the surface hardness in relation to the Almen intensity has a significant role in the wear behavior. Similar findings were reported by Unal et al [ 16 ] as they presented an improvement in the wear behavior of CP Ti (Grade 2) with shot peening.…”

A novel method for determination of surface treatment effect on mechanical properties of titanium bulk material

“…The same procedure was repeated by Bae et al 6 and Maawad et al 7 for more variety of Titanium alloys. In the similar direction, Karaoglanli 8 put the pure Titanium grade 2 samples under a flow of shots and inspected their effect on the resistance to wear. Severe plastic deformations with various time rates and different Almen grades were created on the surface.…”

Micro-Abrasion Wear Behavior of Thermal-Spray-Coated Steel Tooth Drill Bits

“…However, a little attention was payed in literature to the effects of micro-abrasion on wear and corrosion behavior [19][20]. Such effects are important to characterize, because micro-abrasion in rock drilling and industrial applications typically occurs in different tribo-corrosive environments.…”