Abstract
In this study, in order to achieve a better understanding of the strengthening mechanism in the commercially pure (CP) Ti welds, autogenously laser beam and laser-MIG hybrid welding of 4.2 mm thick CP-Ti plates were performed and the correlation between microstructure, texture distribution and the mechanical properties were systematically investigated. Microstructural coarsening and increase in microhardness were observed in the HAZ and WZ. The tensile test results suggested the base metal was the weak point of the joint for both welding conditions. The EBSD observations confirmed that a large number of \( \left\{10\overline{1}2\right\} \) and \( \left\{11\overline{2}2\right\} \) twin grains occurred in the HAZ and WZ of both welded joints, while a higher concentration of these twin grains were found in the laser-MIG hybrid joints. High concentration of the twin grain boundaries can act as barrier to stop dislocation slip during deformation and therefore contribute to the strengthening of the welds. The existence of very small twin grains and acicular α phase in HAZ and WZ would equivalently reduce the averaged grain size and therefore induce an increase in strength based on Hall-Petch’s law. In addition, the averaged Schmid factor of BM is higher than that of the WZ and HAZ in both welding joints suggesting that the grain boundary sliding will take place preferably in BM during deformation so that the necking and fracture occurred in base metal during tensile tests of both welding joint specimens.
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References
Polmear IJ, StJohn D, Nie J.-F, and Qian M, Light alloys: metallurgy of the light metals
Geetha M, Singh AK, Asokamani R, Gogia AK (2009) Ti based biomaterials, the ultimate choice for orthopaedic implants—a review. Prog Mater Sci 54(3):397–425
Wang ZB, Hu HX, Zheng YG, Ke W, Qiao YX (2016) Comparison of the corrosion behavior of pure titanium and its alloys in fluoride-containing sulfuric acid. Corros Sci 103:50–65
Palanivel R, Dinaharan I, Laubscher RF (2017) Microstructure evolution and mechanical characterization of Nd:YAG laser beam welded titanium tubes. Mater Charact 134:225–235
Wu M, Xin R, Wang Y, Zhou Y, Wang K, Liu Q (2016) Microstructure, texture and mechanical properties of commercial high-purity thick titanium plates jointed by electron beam welding. Mater Sci Eng A 677:50–57
Zhao Y, Wang W, Yan K, Liu C, Zou J (2018) Microstructure and properties of Cu/Ti laser welded joints. J Mater Process Technol 257:244–249
Schneider A, Gumenyuk A, Lammers M, Malletschek A, Rethmeier M (2014) Laser beam welding of thick titanium sheets in the field of marine technology. Phys Procedia 56:582–590
Liu H, Shui J, Cai T, Chen Q, Song XG, Yang GJ (2018) Microstructural evolution and hardness response in the laser beam welded joints of pure titanium during recrystallization and grain growth. Mater Charact 145:87–95
Ascari A, Fortunato A, Guerrini G, Liverani E, Lutey A (2017) Long pulse laser micro welding of commercially pure titanium thin sheets. Procedia Eng 184:274–283
Yokohara K, Okamoto Y, Ochiai H, Kimura R, Ono S, Akase M (2016) Investigation of shielding gas supplying method in vertical-position laser welding of pure titanium. Procedia CIRP 42:448–453
Zhan X, Peng Q, Wei Y, Ou W (2017) Experimental and simulation study on the microstructure of TA15 titanium alloy laser beam welded joints. Opt Laser Technol 94:279–289
Liu H, Nakata K, Zhang JX, Yamamoto N, Liao J (2012) Microstructural evolution of fusion zone in laser beam welds of pure titanium. Mater Charact 65:1–7
Kumar C, Das M, Paul CP, Bindra KS (2018) Comparison of bead shape, microstructure and mechanical properties of fiber laser beam welding of 2 mm thick plates of Ti-6Al-4V alloy. Opt Laser Technol 105:306–321
Li R, Li Z, Zhu Y, Rong L (2011) A comparative study of laser beam welding and laser–MIG hybrid welding of Ti–Al–Zr–Fe titanium alloy. Mater Sci Eng A 528(3):1138–1142
Acherjee B (2018) Hybrid laser arc welding: state-of-art review. Opt Laser Technol 99:60–71
XU G et al (2015) Numerical analysis of fluid flow in laser+gmaw hybrid welding. Acta Met Sin 51(6):713–723
Maawad E et al (2016) Influence of crystallographic texture on the microstructure, tensile properties and residual stress state of laser-welded titanium joints. Mater Des 101:137–145
Hahn EN, Meyers MA (2015) Grain-size dependent mechanical behavior of nanocrystalline metals. Mater Sci Eng A 646:101–134
Liu H, Nakata K, Yamamoto N, Liao J (2011) Mechanical properties and strengthening mechanisms in laser beam welds of pure titanium. Sci Technol Weld Join 16(7):581–585
Li C, Muneharua K, Takao S, Kouji H (2009) Fiber laser-GMA hybrid welding of commercially pure titanium. Mater Des 30(1):109–114
Karpagaraj A, Siva shanmugam N, Sankaranarayanasamy K (2015) Some studies on mechanical properties and microstructural characterization of automated TIG welding of thin commercially pure titanium sheets. Mater Sci Eng A 640:180–189
Wang XY, Li WY, Ma TJ, Vairis A (2017) Characterisation studies of linear friction welded titanium joints. Mater Des 116:115–126
Mironov S, Sato YS, Kokawa H (2009) Development of grain structure during friction stir welding of pure titanium. Acta Mater 57(15):4519–4528
Shen J et al (2018) Microstructure evolution and mechanical properties of flash butt-welded Inconel718 joints. Mater Sci Eng A 718:34–42
Short AB (2009) Gas tungsten arc welding of α+β titanium alloys: a review. Mater Sci Technol 25(3):309–324
Chen Z, Gao J, Yan K (2018) Formation of twin boundaries in commercial purity aluminum with addition of Ti refiner. Mater Lett 221:1–3
Ghaderi A, Barnett MR (2011) Sensitivity of deformation twinning to grain size in titanium and magnesium. Acta Mater 59(20):7824–7839
Gurao NP, Kapoor R, Suwas S (2011) Deformation behaviour of commercially pure titanium at extreme strain rates. Acta Mater 59(9):3431–3446
Liu H, Nakata K, Yamamoto N, Liao J (2010) Grain orientation and texture evolution in pure titanium lap joint produced by friction stir welding. Mater Trans 51(11):2063–2068
Wronski M, Arul Kumar M, Capolungo L, McCabe RJ, Wierzbanowski K, Tomé CN (2018) Deformation behavior of CP-titanium: experiment and crystal plasticity modeling. Mater Sci Eng A 724:289–297
Nixon ME, Lebensohn RA, Cazacu O, Liu C (2010) Experimental and finite-element analysis of the anisotropic response of high-purity α-titanium in bending. Acta Mater 58(17):5759–5767
Pouraliakbar H, Jandaghi MR, Mohammadi Baygi SJ, Khalaj G (2017) Microanalysis of crystallographic characteristics and structural transformations in SPDed AlMnSi alloy by dual-straining. J Alloys Compd 696:1189–1198
Fernandes FAO, Oliveira DF, Pereira AB (2017) Optimal parameters for laser welding of advanced high-strength steels used in the automotive industry. Procedia Manuf 13:219–226
Kashaev N et al (2017) Microstructure and mechanical performance of autogenously fibre laser beam welded Ti-6242 butt joints. Mater Sci Eng A 694:110–120
Liu FC, Liao J, Gao Y, Nakata K (2015) Influence of texture on strain localization in stir zone of friction stir welded titanium. J Alloys Compd 626:304–308
Pouraliakbar H, Jandaghi MR, Heidarzadeh A, Jandaghi MM (2018) Constrained groove pressing, cold-rolling, and post-deformation isothermal annealing: consequences of their synergy on material behavior. Mater Chem Phys 206:85–93
Sarkari Khorrami M, Mostafaei MA, Pouraliakbar H, Kokabi AH (2014) Study on microstructure and mechanical characteristics of low-carbon steel and ferritic stainless steel joints. Mater Sci Eng A 608:35–45
Acknowledgements
The authors acknowledge the financial support provided by the National Natural Science Foundation of China (Grant No. 51405206) and the China Postdoctoral Science Foundation (Grant No. 2017M611750).
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Li, R., Zhang, F., Sun, T. et al. Investigation of strengthening mechanism of commercially pure titanium joints fabricated by autogenously laser beam welding and laser-MIG hybrid welding processes. Int J Adv Manuf Technol 101, 377–389 (2019). https://doi.org/10.1007/s00170-018-2922-9
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DOI: https://doi.org/10.1007/s00170-018-2922-9