Microstructure and high-temperature tribological properties of Ti–6Al–4V alloy treated by laser shock peening

Li Zhang; Wentai Ouyang; Haichen Wu; Xiu Qin; Shuowen Zhang; Weixin Xie; Shilong Jiang; Wenwu Zhang; Liyuan Sheng

Journal of Materials Research and Technology (Mar 2024)

Microstructure and high-temperature tribological properties of Ti–6Al–4V alloy treated by laser shock peening

Li Zhang,
Wentai Ouyang,
Haichen Wu,
Xiu Qin,
Shuowen Zhang,
Weixin Xie,
Shilong Jiang,
Wenwu Zhang,
Liyuan Sheng

Affiliations

Li Zhang: Key Laboratory of Aero Engine Extreme Manufacturing Technology of Zhejiang Province, Ningbo Institute of Materials Technology and Engineering, CAS, Ningbo, 315201, China; Ningbo University, Ningbo, 315211, Zhejiang, China
Wentai Ouyang: Key Laboratory of Aero Engine Extreme Manufacturing Technology of Zhejiang Province, Ningbo Institute of Materials Technology and Engineering, CAS, Ningbo, 315201, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Corresponding author. Key Laboratory of Aero Engine Extreme Manufacturing Technology of Zhejiang Province, Ningbo Institute of Materials Technology and Engineering, CAS, Ningbo, 315201, China.
Haichen Wu: Key Laboratory of Aero Engine Extreme Manufacturing Technology of Zhejiang Province, Ningbo Institute of Materials Technology and Engineering, CAS, Ningbo, 315201, China
Xiu Qin: Key Laboratory of Aero Engine Extreme Manufacturing Technology of Zhejiang Province, Ningbo Institute of Materials Technology and Engineering, CAS, Ningbo, 315201, China
Shuowen Zhang: Key Laboratory of Aero Engine Extreme Manufacturing Technology of Zhejiang Province, Ningbo Institute of Materials Technology and Engineering, CAS, Ningbo, 315201, China
Weixin Xie: Huizhou Port Customs, Huizhou, 516084, China
Shilong Jiang: PKU-HKUST Shenzhen-Hongkong Institution, Shenzhen, 518057, China
Wenwu Zhang: Key Laboratory of Aero Engine Extreme Manufacturing Technology of Zhejiang Province, Ningbo Institute of Materials Technology and Engineering, CAS, Ningbo, 315201, China; University of Chinese Academy of Sciences, Beijing, 100049, China
Liyuan Sheng: Shenzhen Institute, Peking University, Shenzhen, 518057, China; PKU-HKUST Shenzhen-Hongkong Institution, Shenzhen, 518057, China; Corresponding author. Shenzhen Institute, Peking University, Shenzhen, 518057, China.

Journal volume & issue: Vol. 29
pp. 4129 – 4145

Abstract

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The high-temperature wear resistance plays an important role for Ti–6Al–4V alloy components working in extreme environments, especially vital for avoiding unexpected failure. However, the reasonable method of surface modification should meet the requirement of improving in wear resistance and less decreasing in mechanical properties simultaneously, which brings a great challenge. In the present research, the laser shock peening (LSP) technique was applied to optimize the superficial layer of Ti–6Al–4V alloy by different processing. The microstructure, elastic modulus, nano-hardness and high-temperature tribology properties of the LSP processed Ti–6Al–4V were investigated to reveal the improving effect. The results demonstrate the LSP processing transforms the dual-size grain structure to relative homogeneous grain structure and forms the gradient nano-structure in superficial layer. With the increasing of LSP processing numbers, the density of geometrically necessary dislocation (GND) decreases obviously, but the density of statistically stored dislocation (SSD) rises significantly, which promotes the increase of total dislocation density compared with the as-received (AR) alloy. Due to the crystal evolution, the Ti–6Al–4V alloy with three-times LSP processing has the lowest wear rate which is less than half of the as-received state. The observations on worn surface and adjacent cross-sectional microstructure reveal the severe scratching and many inner microcracks in the AR sample but the slight scraping and few inner microcracks in the three-times LSP processed sample. Considering the elevated nano-hardness and elastic modulus, the improved tribological properties should be mainly attributed to the optimized microstructure and dislocation state by LSP processing. The present research provides a more reasonable method to improve the high-temperature wear properties of Ti–6Al–4V alloy.

Published in Journal of Materials Research and Technology

ISSN: 2238-7854 (Print); 2214-0697 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/journal-of-materials-research-and-technology/

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