University of Oulu

Luo, G., Zhang, L., Xiong, Y. et al. Microstructure Evolution and Improved Surface Properties of Ti-6Al-3Nb-2Zr-1Mo Alloy by Laser Shot Peening. J. of Materi Eng and Perform 31, 5571–5582 (2022). https://doi.org/10.1007/s11665-022-06618-6

Microstructure evolution and improved surface properties of Ti-6Al-3Nb-2Zr-1Mo alloy by laser shot peening

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Author: Luo, Gaoli1; Zhang, Lingfeng1,2; Xiong, Yi1,2;
Organizations: 1School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang, 471023, Henan, China
2Collaborative Innovation Center of New Nonferrous Metal Materials and Advanced Processing Technology Jointly Established by the Ministry of Science and Technology, Luoyang, 471023, Henan, China
3School of Mechanical Engineering, Huanghe S & T University, Zhengzhou, 450063, Henan, China
4Nano and Molecular Systems Research Unit, University of Oulu, FIN-90014, Oulu, Finland
Format: article
Version: accepted version
Access: embargoed
Persistent link: http://urn.fi/urn:nbn:fi-fe202301112341
Language: English
Published: Springer Nature, 2022
Publish Date: 2023-03-11
Description:

Abstract

In this work, the surface modification of Ti-6Al-3Nb-2Zr-1Mo (Ti80) alloy was performed by laser shock peening (LSP). The resultant microstructure, mechanical properties and corrosion properties of LSP-treated (LSPed) Ti80 were systematically investigated by 3D profiler, x-ray diffractometer (XRD), optical microscope (OM), transmission electron microscope (TEM), scanning electron microscope (SEM), microhardness tester, tensile tester and electrochemical workstation. LSP induced significant number of dislocations through plastic deformation, forming many defects such as dislocation tangles, stacking faults and deformation twins. The surface grain was severely refined due to severe plastic deformation at the surface. Microhardness improved substantially by 26.7%, compressive residual stress reached its maximum value (−307 MPa), and both microhardness and compressive residual stress presented a gradient change along depth. The tensile properties were improved by the action of work hardening, grain refinement and compressive residual stresses after LSP. The fracture changed from typical ductile to mixed ductile and brittle fracture. Grain refinement provides more nucleation sites for the formation of passivation film, while impurities are not easily segregated at grain boundaries, retarding intergranular corrosion, high-density dislocations hinder electron transfer and reduce corrosion current density, resulting in a significant improvement in the corrosion resistance of Ti80 alloy in 3.5% NaCl and 5M HCL solution.

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Series: Journal of materials engineering and performance
ISSN: 1059-9495
ISSN-E: 1544-1024
ISSN-L: 1059-9495
Volume: 31
Issue: 7
Pages: 5571 - 5582
DOI: 10.1007/s11665-022-06618-6
OADOI: https://oadoi.org/10.1007/s11665-022-06618-6
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
116 Chemical sciences
Subjects:
Copyright information: © ASM International. This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at: http://dx.doi.org/10.1007/s11665-022-06618-6