Effect of ultrasonic shot peening duration on microstructure, corrosion behavior and cell response of cp-Ti

Gradient Microstructure Induced by Surface Mechanical Attrition Treatment in Grade 2 Titanium Studied Using Positron Annihilation Spectroscopy and Complementary Methods

“…Additionally, a passive film that was formed on the SMATed specimens is more stable in comparison to the one formed on the non-treated sample, which makes it harder to cross for chloride ions. An increase in corrosion resistance USP cp titanium in the electrolyte similar to this applied in the present study, i.e., Ringer’s Solution was reported by Agrawal et al [ 51 ]. Those authors attributed better corrosion resistance to the enhanced formation of a passive oxide protective film due to the presence of many grain boundaries on the surface of USP titanium.…”

“…The crystallite size in the present study is comparable to those reported in the literature obtained using XRD measurements even for different SMAT parameters [ 49 , 50 ]. They are larger than those obtained by Agrawal et al for cp titanium and similar SMAT parameters including the short duration between 30 and 120 s, which were close to 20 nm with the microstrain close to 0.20% [ 51 ]. However, there is even a better concurrence between the present results and those reported in ref.…”

A Review on Ultrasonic-Assisted Forming: Mechanism, Model, and Process

“…To improve the performance of the workpiece, the surface plastic forming method was used for surface modification in the final stage of processing. In recent years, researchers have developed various surface treatment (UST) processes based on UV, such as ultrasonic shot peening [103][104][105], ultrasonic impact treatment [106][107][108], and ultrasonic surface rolling [85,109,110]; the principles of the different UST processes are similar. Severe plastic deformation on the material surface is caused by high-frequency vibration tools, which rapidly change the structure of the surface layer and improve the mechanical properties of the material, such as the elongation and yield ratio [86,87,108,[111][112][113][114][115].…”

“…The UST generates a residual compressive stress on the workpiece surface, thereby improving the damage tolerance and fatigue life of the material [103,104,[118][119][120][121][122][123]. For the Ti-6Al-4V alloy, the fatigue strength was increased by 60%-72.7% and the fatigue lifetime was extended by two orders of magnitude using UST (Figure 14b) [106,109,124].…”

Enhanced Physicochemical and Biological Properties of a Low-Temperature Copperized Layer on Gradient Nanograined Pure Titanium

“…Since a large number of grain boundaries in nanograined materials can act as channels for rapid atomic diffusion, , a gradient nanograined (GNG) surface layer fabricated by surface nanocrystallization technology can significantly accelerate the diffusion kinetics, thereby reducing the processing temperature and/or duration. − At the same time, low-temperature alloying, in turn, reduces the coarsening of nanograins, thus retaining the superior properties of GNG Ti. − However, the GNG layers obtained by commonly used surface attrition mechanical treatment (SMAT) − or shot peening (SP) − were relatively rough and unevenly deformed, which is detrimental to the subsequent copperizing process. In recent years, surface ultrasonic rolling treatment (SURT), as a novel technology utilizing ultrasonic vibrations superimposed on rolling, has been applied to induce a uniform deformation layer with a good surface finish, − thus facilitating the subsequent copperizing process.…”