Impact-Sliding Tribology Behavior of TC17 Alloy Treated by Laser Shock Peening.

Meigui Yin,Wenjian Wang,Zhenbing Cai,Weifeng He

doi:10.3390/ma11071229

Meigui Yin, Wenjian Wang + Show 2 more

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https://doi.org/10.3390/ma11071229

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Abstract

Outer particle collision with certain dynamic objects is not a pure impact wear behavior; it is typically accompanied by sliding wear phenomena. This study is aimed at investigating the impact-sliding wear performance of three different TC17 titanium alloys. One was untreated, and the other two were subjected to laser shock peening (LSP) by 5 and 7 J pulse energy, respectively. The wear test was performed on a novel impact-sliding wear testing rig, which can realize multiple impact-sliding motions by changing motion parameters in the x and z directions. Present results showed that wear resistance of both treated samples improved compared with the untreated alloy. Given the increase in wear cycles, increment in wear rate of the untreated sample was constantly higher than those of the treated samples. All results can be attributed to the increase in surface hardness of the material and residual compressive stress, which was also introduced after LSP.

Highlights

Considering the rapid development of the aviation industry, more types of high performance titanium alloys have been widely used in the aviation manufacturing field
Liu et al [9,10,11] studied the microstructural characteristics of TC17 after shot peening, which was achieved by projecting some small particles on the surface of samples to form a strengthened layer with a certain thickness; some heat treatment techniques are applied to improve friction and wear properties of titanium alloys [12,13]
Residual stress cannot only impede the initiation of fatigue delamination cracks, but the. These findings indicated that compressive residual stress has been introduced been introduced after laser shock peening (LSP), and this kind stress can extend the fatigue life of the metal components

Summary

Introduction

Considering the rapid development of the aviation industry, more types of high performance titanium alloys have been widely used in the aviation manufacturing field. These materials commonly exhibit excellent properties, such as high strength to weight ratio, excellent toughness, and outstanding corrosion resistance [1,2]. Researchers have proposed several surface treatment technologies to improve mechanical properties of titanium alloys. Some coatings, such as carbide, nitride oxide, and other compounds, have been commonly used to improve superficial properties of materials to protect substrates against material degradation and failure [7,8]. Liu et al [9,10,11] studied the microstructural characteristics of TC17 after shot peening, which was achieved by projecting some small particles on the surface of samples to form a strengthened layer with a certain thickness; some heat treatment techniques are applied to improve friction and wear properties of titanium alloys [12,13]

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