Strengthening of Ti-6Al-4V alloy by high temperature ultrasonic nanocrystal surface modification technique

Amanov, Auezhan; Urmanov, B.; Amanov, Tileubay; Pyun, Young Sik

doi:10.1016/j.matlet.2017.03.059

Cited by 41 publications

(16 citation statements)

References 12 publications

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“…In general, UNSM reduces the surface roughness, increases the surface hardness, refines grain size and induces high compressive residual stress with the depth of hardened layer in the range of ~0.1 to ~0.3 mm [23,25]. UNSM temperature-dependent surface hardness and phase transformation of wrought Ti-6Al-4V alloy were reported earlier [26], but the influence of UNSM temperature-dependent mechanical and tribological properties of AM fabricated Ti-6Al-4V alloy was not investigated yet. Therefore, in this study, the synergy effect of UNSM and local heat treatment (LHT) on the improvement of tensile and tribological properties of SLM fabricated Ti-6Al-4V alloy is investigated.…”

Section: Introductionmentioning

confidence: 52%

Tribology of Ti-6Al-4V Alloy Manufactured by Additive Manufacturing

Amanov¹

2021

Tribology in Materials and Manufacturing - Wear, Friction and Lubrication

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In this study, the influence of ultrasonic nanocrystal surface modification (UNSM), which was applied as a post-additive manufacturing (AM), in terms of surface, tensile and tribological properties of Ti-6Al-4V alloy by selective laser melting (SLM) was investigated. Ti-6Al-4V alloy was subjected to UNSM at room and high temperatures (RT and HT). It was found that the UNSM enhanced the strength and reduced the roughness of the as-SLM sample, where both increased with increasing UNSM temperature. The UNSM bore influence on tribological properties, where the friction coefficient of the as-SLM sample reduced by about 25.8% and 305% and the wear resistance enhanced by about 41% and 246% at RT and HT, respectively. These are essentially attributed to the enhanced strength, smoothed surface and expelled pores from the surface. Based on SEM images, the damage caused by abrasive wear was the most observed in the wear track of the as-SLM sample than was caused by the highest wear rate. The UNSM temperaturedependent wear mechanisms were comprehensively investigated and elaborated based on the obtained experimental data and observed microstructural images. Indeed, a further investigation is required to improve the characteristics of as-SLM Ti-6Al-4V alloy to the wrought level due to the replacement possibility.

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Section: Introductionmentioning

confidence: 52%

Tribology of Ti-6Al-4V Alloy Manufactured by Additive Manufacturing

Amanov¹

2021

Tribology in Materials and Manufacturing - Wear, Friction and Lubrication

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“…Not only surface hardness, but also strength and ductility of ST3 may be enhanced by grain size refinement through the SPD method [ 23 ]. Practically, the effective depth of UNSM technique at RT for steels—in terms of hardened or grain size refined layer—may reach up to 200–300 µm depending on the UNSM treatment parameters, but that depth can be deepened even more by increasing the UNSM treatment temperature [ 13 , 24 ]. Hence, it can be assumed based on the percentage of hardness increase that the effective depth of the UNSM technique may reach up to over 100 µm.…”

Section: Resultsmentioning

confidence: 99%

Experimental Investigation on Friction and Wear Behavior of the Vertical Spindle and V-belt of a Cotton Picker

2019

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This study deals with the friction and wear behavior of the vertical spindle and V-belt to improve the reliability, operation and to extend the service life of a cotton picker. The vertical spindle made of low-carbon steel (ST3) was treated by the ultrasonic nanocrystal surface modification (UNSM) technique to control the friction and wear behavior. It was found that the UNSM technique reduced surface roughness and increased surface hardness of the vertical spindle. The friction and wear behavior of the vertical spindle and V-belt was assessed by carrying out tribological tests and the results showed that the UNSM-treated vertical spindle generated a higher friction coefficient compared to the untreated one due to having less slip. In case of wear resistance, unmeasurable wear occurred on the surface of the vertical spindle due to its significant high hardness compared to the hardness of the V-belt that came into contact with the vertical spindle in relative motion. Hence, the wear behavior and mechanisms of the V-belts were systematically investigated and also discussed based on the wear track profiles and micrographs. It can be concluded that the application of the UNSM technique to the vertical spindle may contribute to improve the performance of cotton pickers by reducing the slip and prolonging the service life.

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“…It is worth mentioning here that the changes, such as strain, work hardening, etc. of the UNSM treatment at both RT and HT specimens can be estimated by quantitatively analyzing the broadening in FWHM and reduction in relative intensity of diffraction peaks [ 39 ]. Top surface grain size of the specimens quantified based on the Scherer equation was in consistent with the cross-sectional EBSD IPF maps, where the refinement of coarse grains into (sub) grains is clearly seen in Figure 1 b,d, where the refined (sub) grain size by UNSM treatment at RT was further refined with increasing the temperature, leading to the highest fraction (~23.8%) of sub (grains) at the top surface.…”

Section: Resultsmentioning

confidence: 99%

“…The development of LHT with UNSM treatment successfully demonstrated the possibility of further improvement in wear resistance of Ti-6Al-4V alloy by increasing the hardness, compressive residual stress, refining grain size in comparison with the UNSM-treated specimen at RT [ 26 ]. Moreover, it has been reported in our previous study that a gradient nanostructured surface layer with a thickness of about 60 µm was produced in Ti-6Al-4V by UNSM treatment at RT, while LHT with UNSM at HT of 800 °C was able to increase the thickness of nanostructured surface layer by up to about 100 µm [ 39 ].…”

Section: Resultsmentioning

confidence: 99%

Gradient Nanostructured Tantalum by Thermal-Mechanical Ultrasonic Impact Energy

2018

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Microstructural evolution and wear performance of Tantalum (Ta) treated by ultrasonic nanocrystalline surface modification (UNSM) at 25 and 1000 °C were reported. The UNSM treatment modified a surface along with subsurface layer with a thickness in the range of 20 to 150 µm, which depends on the UNSM treatment temperature, via the surface severe plastic deformation (S2PD) method. The cross-sectional microstructure of the specimens was observed by electron backscattered diffraction (EBSD) in order to confirm the microstructural alteration in terms of effective depth and refined grain size. The surface hardness measurement results, including depth profile, revealed that the hardness of the UNSM-treated specimens at both temperatures was increased in comparison with those of the untreated ones. The increase in UNSM treatment temperature led to a further increase in hardness. Moreover, both the UNSM-treated specimens with an increased hardness resulted in a higher resistance to wear in comparison with those of the untreated ones under dry conditions. The increase in hardness and induced compressive residual stress that depend on the formation of severe plastically deformed layer with the refined nano-grains are responsible for the enhancement in wear resistance. The findings of this study may be implemented in response to various industries that are related to strength improvement and wear enhancement issues of Ta.

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Strengthening of Ti-6Al-4V alloy by high temperature ultrasonic nanocrystal surface modification technique

Cited by 41 publications

References 12 publications

Tribology of Ti-6Al-4V Alloy Manufactured by Additive Manufacturing

Tribology of Ti-6Al-4V Alloy Manufactured by Additive Manufacturing

Experimental Investigation on Friction and Wear Behavior of the Vertical Spindle and V-belt of a Cotton Picker

Gradient Nanostructured Tantalum by Thermal-Mechanical Ultrasonic Impact Energy

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