Effects of heat treatment combined with laser shock peening on wire and arc additive manufactured Ti17 titanium alloy: Microstructures, residual stress and mechanical properties

Chi, Jiaxuan; Cai, Zhongyi; Wan, Zhandong; Zhang, Hongqiang; Chen, Zhenlin; Li, Liuhe; Liu, Ying; Peng, Peng; Guo, Wei

doi:10.1016/j.surfcoat.2020.125908

Cited by 98 publications

(31 citation statements)

References 37 publications

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“…The Arrhenius, Johnson-Cook and Khan-Huang-Liang equations precisely described the process but only in the plastic deformation zone [39,[45][46][47][48][49]. The Arrhenius model, in spite of the fact that it is widely used [50,51], turned out to be less precise than JC and Anand models in our studies.…”

Section: Materials Observationsmentioning

confidence: 90%

New approach in constitutive modelling of commercially pure titanium thermo-mechanical processing

Bańczerowski

Pawlikowski

2021

Continuum Mech. Thermodyn.

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The pure titanium, as a biomaterial destined for production of load-demanding prostheses, requires thermo-mechanical processing to increase its strength. The most common way to achieve this is the method of grain fragmentation. Thermo-mechanical deformation of titanium is a complex process, which makes it very difficult to describe it by means of constitutive equations. Such constitutive relations are very useful as they can be implemented in the finite element method tools in order to simulate and optimize the whole process. Cylindrical specimens were compressed at elevated temperatures on a thermo-mechanical simulator. The tests were performed at four different strain rates (from 10$$^{\mathrm {-2}}$$ - 2 s$$^{\mathrm {-1}}$$ - 1 to 10 s$$^{\mathrm {-1}})$$ - 1 ) and at 775 K and 875 K temperatures. The collected data allowed us to create strain–stress graphs characterizing the process. Observations on the scanning electron microscope and scanning transmission electron microscope were done as well as the electron backscatter diffraction analysis, revealing significant grain fragmentation. The aim of the studies described in the paper was to verify and select a proper mathematical model for the process of titanium grain fragmentation obtained in a thermoplastic process. Four different constitutive models were considered. The calculation of theoretical stress values based on the Arrhenius-type equation, Anand viscoplastic model, Johnson–Cook model and Khan Huang-Liang model was done and compared to experimental results. The theoretical curves were generated and fitted to experimental, which made it possible to calibrate the constants in the mathematical models. The curve-fitting analyses showed that the Anand constitutive model described the titanium behaviour best.

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Section: Materials Observationsmentioning

confidence: 90%

New approach in constitutive modelling of commercially pure titanium thermo-mechanical processing

Bańczerowski

Pawlikowski

2021

Continuum Mech. Thermodyn.

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“…Chen and co-workers (Ref 88 ) demonstrated that LSP can be used to improve the oxidation resistance of AM TiC/Inconel 625 nanocomposites. Chi and co-workers (Ref 89 ) demonstrated that LSP can transform the residual stresses from tensile to compressive stresses in AM Ti17 alloys, in addition to significantly increasing the hardness through grain refinement and work-hardening. Hackel and co-workers demonstrated that LSP outperformed shot peening for improving the fatigue performance of AM 316L with and without notches (Ref 84 ); LSP was found to improve the fatigue strength of AM 316L with notches by 60%.…”

Section: Post-processing Methods For Am Metalsmentioning

confidence: 99%

Effects of Post-processing on the Surface Finish, Porosity, Residual Stresses, and Fatigue Performance of Additive Manufactured Metals: A Review

Zhang

Zhao

et al. 2021

J. of Materi Eng and Perform

108

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Additive manufacturing (AM) has attracted much attention due to its capability in building parts with complex geometries. Unfortunately, AM metals suffer from three major drawbacks, including high porosity, poor surface finish, and tensile residual stresses, all of which will significantly compromise the fatigue performance. These drawbacks present a major obstacle to the application of AM metals in industries that produce fatigue-sensitive components. Many post-processing methods, including heat treatment, hot isotropic pressing, laser shock peening, ultrasonic nanocrystal surface modification, advanced finishing and machining, and laser polishing, have been used to treat AM metals to decrease their porosity, improve the surface finish, and eliminate tensile residual stresses. As a result, significant improvement in fatigue performance has been observed. In this paper, the state of the art in utilizing post-processing techniques to treat AM metals and the effects of these treatments on the porosity, surface finish, and residual stresses of metal components and their resultant fatigue performance are reviewed.

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“…For example, changing the surface energy of the molten pool makes it difficult for droplets to spread. The droplet has a large wetting angle owing to the laser effect (Singh et al , 2022; Näsström et al , 2019; Singh et al , 2021; Chi et al , 2020), as shown in Figure 7. The outcome of using oscillating laser-assisted WAAM is the opposite; herein, the temperature distribution inside the molten pool is altered, which triggers an increase in the width of the deposited layer owing to the impact of the liquid metal from the bottom to the walls of the molten pool (Gong et al , 2020).…”

Section: Changed Molten Pool Dynamicsmentioning

confidence: 99%

Forming accuracy improvement in wire arc additive manufacturing (WAAM): a review

Dong

Miao

et al. 2022

RPJ

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Purpose This paper aims to anticipate the possible development direction of WAAM. For large-scale and complex components, the material loss and cycle time of wire arc additive manufacturing (WAAM) are lower than those of conventional manufacturing. However, the high-precision WAAM currently requires longer cycle times for correcting dimensional errors. Therefore, new technologies need to be developed to achieve high-precision and high-efficiency WAAM. Design/methodology/approach This paper analyses the innovations in high-precision WAAM in the past five years from a mechanistic point of view. Findings Controlling heat to improve precision is an effective method. Methods of heat control include reducing the amount of heat entering the deposited interlayer or transferring the accumulated heat out of the interlayer in time. Based on this, an effective and highly precise WAAM is achievable in combination with multi-scale sensors and a complete expert system. Originality/value Therefore, a development direction for intelligent WAAM is proposed. Using the optimised process parameters based on machine learning, adjusting the parameters according to the sensors’ in-process feedback, achieving heat control and high precision manufacturing.

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Effects of heat treatment combined with laser shock peening on wire and arc additive manufactured Ti17 titanium alloy: Microstructures, residual stress and mechanical properties

Cited by 98 publications

References 37 publications

New approach in constitutive modelling of commercially pure titanium thermo-mechanical processing

New approach in constitutive modelling of commercially pure titanium thermo-mechanical processing

Effects of Post-processing on the Surface Finish, Porosity, Residual Stresses, and Fatigue Performance of Additive Manufactured Metals: A Review

Forming accuracy improvement in wire arc additive manufacturing (WAAM): a review

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