Experimental investigation of tensile,fracture and fatigue crack growth behavior of LPBF-fabricated Ti-6Al-4V/TiC composites

Abstract

In this study, the influence of TiC reinforcement content on the tensile and fatigue behavior of Ti-6Al-4V alloy fabricated using the Laser Powder Bed Fusion (LPBF) process was investigated. Ti-6Al-4V and Ti-6Al-4V/TiC composites with different wt.% of TiC were successfully produced and evaluated through tensile, fracture toughness, and fatigue testing. The results demonstrated that TiC reinforcement significantly improves the mechanical performance of the alloy. The maximum tensile strength of 1378.8 MPa was achieved, corresponding to a 15.3% increase compared to the base alloy, while the elastic modulus increased by 16.8%. However, ductility decreased markedly from 11.5% to 4.6% due to the presence of hard ceramic particles. Fracture toughness increased with TiC addition, rising from 58.6 MPa√m for the base alloy to a maximum of 68.5 MPa√m. SEM analysis of the fabricated samples revealed a uniform distribution of TiC within the Ti-6Al-4V matrix, and EDS elemental mapping confirmed the presence of Ti, Al, V, and C, with minor traces of O, N, and Fe. Tensile fracture surfaces showed ductile dimple fracture for the base alloy, whereas TiC-reinforced composites exhibited finer dimples and mixed-mode fracture behavior. Fatigue crack growth analysis using CT specimens indicated restricted crack propagation in reinforced samples. Fatigue strength was enhanced with the addition of TiC, with endurance strength increasing by 15.2%. S–N curves developed for different composites confirmed an improvement in fatigue life.

Keywords

tensile strength fracture toughness fatigue strength EDS analysis crack growth SEM analysis

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References

Fatemi

Molaei

Simsiriwong

, et al. Fatigue behaviour of additive manufactured materials: an overview of some recent experimental studies on Ti‐6Al‐4V considering various processing and loading direction effects. Fatig Fract Eng Mater Struct 2019; 42(5): 991–1009. https://doi.org/10.1111/ffe.13000

Sterling

Shamsaei

Torries

, et al. Fatigue behaviour of additively manufactured Ti-6Al-4 V. Procedia Eng 2015; 133: 576–589. https://doi.org/10.1016/j.proeng.2015.12.632

Leuders

Thöne

Riemer

, et al. On the mechanical behaviour of titanium alloy TiAl6V4 manufactured by selective laser melting: fatigue resistance and crack growth performance. Int J Fatig 2013; 48: 300–307. https://doi.org/10.1016/j.ijfatigue.2012.11.011

Fotovvati

Namdari

Dehghanghadikolaei

. Fatigue performance of selective laser melted Ti-6Al-4V components: state of the art. Mater Res Express 2018; 6(1): 012002. https://doi.org/10.1088/2053-1591/aae10e

Sun

Huang

, et al. Effects of build direction on tensile and fatigue performance of selective laser melting Ti-6Al-4V titanium alloy. Int J Fatig 2020; 130: 105260. https://doi.org/10.1016/j.ijfatigue.2019.105260

Qian

Jian

Pan

, et al. In-situ investigation on fatigue behaviors of Ti-6Al-4V manufactured by selective laser melting. Int J Fatig 2020; 133: 105424. https://doi.org/10.1016/j.ijfatigue.2019.105424

Jiao

, et al. Evaluation on tensile and fatigue crack growth performances of Ti-6Al-4V alloy produced by selective laser melting. Procedia Struct Integr 2017; 7: 124–132. https://doi.org/10.1016/j.prostr.2017.11.069

Kumar

Ramamurty

. High cycle fatigue in selective laser melted Ti-6Al-4V. Acta Mater 2020; 194: 305–320. https://doi.org/10.1016/j.actamat.2020.05.041

Awd

Saeed

Walther

. Quantum mechanical-based fracture behavior of L-PBF/SLM Ti-6Al-4V in the very high cycle fatigue regime. Mater Perform Charact 2023; 12(2): 2–10. https://doi.org/10.1520/mpc20220085

10.

Jiao

. Study on fatigue crack growth behavior of selective laser‐melted Ti-6Al-4V under different build directions, stress ratios, and temperatures. Fatig Fract Eng Mater Struct 2022; 45(5): 1421–1434. https://doi.org/10.1111/ffe.13670

11.

Martins

Branco

Camacho

, et al. The influence of printing strategies on the fatigue crack growth behaviour of an additively manufactured Ti-6Al-4V grade 23 titanium alloy. Int J Fatig 2025; 197: 108942. https://doi.org/10.1016/j.ijfatigue.2025.108942

12.

Verma

Kumar

Jayaganthan

, et al. Extended finite element simulation on tensile, fracture toughness and fatigue crack growth behaviour of additively manufactured Ti-6Al-4V alloy. Theor Appl Fract Mech 2022; 117: 103163. https://doi.org/10.1016/j.tafmec.2021.103163

13.

Soltani-Tehrani

Habibnejad-Korayem

Shao

, et al. Ti-6Al-4V powder characteristics in laser powder bed fusion: the effect on tensile and fatigue behavior. Addit Manuf 2022; 51: 102584. https://doi.org/10.1016/j.addma.2021.102584

14.

Barbagallo

Di Bella

Mirone

, et al. Study of the electron beam melting process parameters’ influence on the tensile behavior of 3D printed Ti-6Al-4V ELI alloy in static and dynamic conditions. Materials 2022; 15(12): 4217. https://doi.org/10.3390/ma15124217

15.

Prakash

Singh

Gupta

. Flow behaviour of Ti-6Al-4V alloy in a wide range of strain rates and temperatures under tensile, compressive and flexural loads. Int J Impact Eng 2023; 176: 104549. https://doi.org/10.1016/j.ijimpeng.2023.104549

16.

Lietaert

Cutolo

Boey

, et al. Fatigue life of additively manufactured Ti-6Al-4V scaffolds under tension-tension, tension-compression and compression-compression fatigue load. Sci Rep 2018; 8(1): 4957. https://doi.org/10.1038/s41598-018-23414-2

17.

Pirotais

Saintier

Brugger

, et al. Ti-6Al-4V lattices obtained by SLM: characterisation of the heterogeneous high cycle fatigue behaviour of thin walls. Procedia Struct Integr 2022; 38: 132–140. https://doi.org/10.1016/j.prostr.2022.03.014

18.

Mahmoud

Al-Rubaie

Elbestawi

. The influence of selective laser melting defects on the fatigue properties of Ti-6Al-4V porosity graded gyroids for bone implants. Int J Mech Sci 2021; 193: 106180. https://doi.org/10.1016/j.ijmecsci.2020.106180

19.

Shi

Sun

Yang

, et al. Failure analysis of an in-vivo fractured patient-specific Ti-6Al-4V mandible reconstruction plate fabricated by selective laser melting. Eng Fail Anal 2021; 124: 105353. https://doi.org/10.1016/j.engfailanal.2021.105353

20.

Zhang

Liu

, et al. Experimental study of performance of Ti-6Al-4V femoral implants using selective laser melting (SLM) methodology. Metals 2024; 14(5): 492. https://doi.org/10.3390/met14050492

21.

Wang

Zhu

Dong

, et al. In-situ synthesized TiC/Ti-6Al-4V composites by elemental powder mixing and spark plasma sintering: microstructural evolution and mechanical properties. J Alloys Compd 2023; 947: 169557. https://doi.org/10.1016/j.jallcom.2023.169557

22.

Ren

Fan

Zuo

, et al. The synergistic strength-toughness optimization effect of TiB2 and TiC composite reinforcing phases in Ti-6Al-4V alloy cladding layers. Metall Res Technol 2026; 123(2): 223. https://doi.org/10.1051/metal/2025153

23.

Panin

Kazachenok

Shugurov

АR

, et al. Deformation and fracture of Ti-6Al-4V/TiC composites 3D printed using wire-feed electron beam additive manufacturing under uniaxial tensile stress. Phys Mesomech 2025; 28(6): 819–834. https://doi.org/10.1134/s1029959925600272

24.

Lal

Dey

Wani

. Nano-indentation characterization of TiC nano ceramic reinforced Ti-6Al-4V matrix composite. J Mater Eng Perform 2025; 34(11): 10577–10590. https://doi.org/10.1007/s11665-024-09779-8