Microstructural analysis of titanium alloys based on high-temperature phase reconstruction
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Abstract
Abstract The microstructural evolution of titanium alloys under high-temperature conditions plays a key role in determining their mechanical properties and hot working behavior. This research presents an advanced method for calibrating β phase reconstruction software using in situ testing on Grade 2 titanium, which achieves accurate reconstruction of the parent β phase microstructure. In addition, unique microstructural observations in the forging of Ti-6246 titanium alloy are highlighted, demonstrating the influence of deformation parameters on the resulting β phase grain structures. Using advanced techniques such as electron backscatter diffraction and Burgers orientation relationship-based software, the research elucidates the behavior of these phases under varying thermal and deformation conditions. In Grade 2 titanium, significant grain growth and phase transformation dynamics were observed upon heating beyond the β-transus temperature during in situ calibration of β phase reconstruction software. The analysis demonstrates the effectiveness of the software in precise reconstructing the parent β phase microstructure based on the orientation of the inherited αs phase. Furthermore, the evaluation of hot forming parameters in Ti-6246 alloy shows the influence of deformation temperature and strain rate on the resulting microstructure. Finite element method analysis coupled with dynamic material modeling elucidates the distribution of temperature, strain rate, and effective strain during forging, which aids in the qualitative assessment of hot workability. Microstructural observations in Ti-6246 alloy forging highlight the presence of elongated colonies of αs phase precipitates, indicative of localized strain intensities and deformation temperatures. In addition, EBSD analysis coupled with β phase reconstruction reveals distinct microstructural features in different regions of the forging. In particular, regions subjected to higher strain rates exhibit elongated β phase grains with pronounced disorientation gradients, suggesting intense deformation. Conversely, optimal forging conditions lead to the appearance of unreinforced axisymmetric β phase grains, indicating dynamic recovery processes. Pole figure analysis further emphasizes the Burgers crystallographic relationship between the αs and β phases, confirming that deformation during forging occurs exclusively within the β phase. These results provide valuable insights into the microstructural evolution in titanium alloys under high-temperature conditions, which are essential for optimizing hot working processes and improving mechanical properties. Graphical abstract
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Research context
OpenAlex topics: Titanium Alloys Microstructure and Properties · Metallurgy and Material Forming · Intermetallics and Advanced Alloy Properties
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References (47)
Show source-provided references
1. Leyens C, Peters M (2003) Titanium and titanium alloys: fundamentals and applications. WILEY-VCH, Weinheim. https://doi.org/10.1002/352760211910.1002/3527602119 ↗
2. Boyer R, Welsch G, Collings EW (1998) Materials properties handbook: titanium alloys. ASM International, OH
3. Huda Z, Edi P (2013) Materials selection in design of structures and engines of supersonic aircrafts: a review. Mater Des 46:552–560. https://doi.org/10.1016/j.matdes.2012.10.00110.1016/j.matdes.2012.10.001 ↗
4. Williams JC, Starke EA (2003) Progress in structural materials for aerospace systems. Acta Mater 51(19):5775–5799. https://doi.org/10.1016/j.actamat.2003.08.02310.1016/j.actamat.2003.08.023 ↗
5. Donachie MJ (2000) Titanium: a technical guide, 2nd ed, ASM International10.31399/asm.tb.ttg2.9781627082693 ↗
6. Jaffery SI, Mativenga PT (2009) Assessment of the machinability of Ti–6Al–4V alloy using the wear map approach. Int J Adv Manuf Technol 40(7–8):687–696. https://doi.org/10.1007/s00170-008-1393-910.1007/s00170-008-1393-9 ↗
7. Lütjering G, Williams JC (2007) Titanium: engineering materials and processes. Springer, Berlin. https://doi.org/10.1007/978-3-540-73036-110.1007/978-3-540-73036-1 ↗
8. Huang S, Zhao Q, Wu C et al (2021) Effects of β-stabilizer elements on microstructure formation and mechanical properties of titanium alloys. J Alloys Compd 876:160085. https://doi.org/10.1016/j.jallcom.2021.16008510.1016/j.jallcom.2021.160085 ↗
9. Kuhlman GW, Kim Y-W, Boyer RR (1991) A critical appraisal of thermomechanical processing of structural titanium alloys. In: Microstructure/property relationships in titanium aluminides and alloys. Warrendale, TMS, USA
10. Welk BA, Taylor N, Kloenne Z et al (2021) Use of alloying to effect an equiaxed microstructure in additive manufacturing and subsequent heat treatment of high-strength Titanium Alloys. Metall Mater Trans A 52:5367–5380. https://doi.org/10.1007/s11661-021-06475-310.1007/s11661-021-06475-3 ↗
11. Du Z, Xiao S, Xu L et al (2014) Effect of heat treatment on microstructure and mechanical properties of a new β high strength titanium alloy. Mater Des 55:183–190. https://doi.org/10.1016/j.matdes.2013.09.07010.1016/j.matdes.2013.09.070 ↗
12. Lu L, Zhang Y, Song K et al (2021) Structural characterization and nanoscale strain field analysis of α/β interface layer of a near α titanium alloy. Nanotechnol Rev 10:1197–1207. https://doi.org/10.1515/ntrev-2021-008510.1515/ntrev-2021-0085 ↗
13. Krawczyk J, Łukaszek-Sołek A, Dąbrowski R (2015) The role of the deformation conditions in the evolution of the microstructure of Ti–6Al–2Sn–4Zr–6Mo alloy. Key Eng Mater 641:116–119. https://doi.org/10.4028/www.scientific.net/KEM.641.11610.4028/www.scientific.net/KEM.641.116 ↗
14. Burgers WG (1934) On the process of transition of the cubic body centered modification into the hexagonal close packed modification of zirconium. Physica 1:561–586. https://doi.org/10.1016/S0031-8914(34)80244-310.1016/S0031-8914(34)80244-3 ↗
15. Zhang M-X, Kelly PM (2005) Edge-to-edge matching and its applications: part I application to the simple HCP/BCC system. Acta Mater 53:1073–1084. https://doi.org/10.1016/j.actamat.2004.11.00710.1016/j.actamat.2004.11.007 ↗
16. Tong V, Joseph S, Ackerman AK et al (2017) Using transmission Kikuchi diffraction to characterise α variants in an α+β titanium alloy. J Microsc 267(3):318–329. https://doi.org/10.1111/jmi.1256910.1111/jmi.12569 ↗
17. Gey N, Humbert M (2002) Characterization of the variant selection occurring during the α→β→α phase transformations of a cold rolled titanium sheet. Acta Mater 50:277–287. https://doi.org/10.1016/S1359-6454(01)00351-210.1016/S1359-6454(01)00351-2 ↗
18. Baeslack WA, Mullins FD (1982) Phase transformation in a welded near-alpha titanium alloy—IMI 829. J Mater Sci Lett 1:371–373. https://doi.org/10.1007/BF0072484110.1007/BF00724841 ↗
19. Humbert M, Wagner F, Moustahfid H et al (1995) Determination of the orientation of a parent β grain from the orientations of the inherited α plates in the phase transformation from body-centred cubic to hexagonal close packed. J Appl Cryst 28:571–576. https://doi.org/10.1107/S002188989500406710.1107/S0021889895004067 ↗
20. Germain L, Gey N, Humbert M (2007) Reliability of reconstructed β-orientation maps in titanium alloys. Ultramicrosc 107:1129–1135. https://doi.org/10.1016/j.ultramic.2007.01.01210.1016/j.ultramic.2007.01.012 ↗
21. Humbert M, Gey N, Muller J et al (1996) Determination of a mean orientation from a cloud of orientations. Application to electron back-scattering pattern measurements. J Appl Cryst 29:662–666. https://doi.org/10.1107/S002188989600669310.1107/S0021889896006693 ↗
22. Glavicic MG, Bartha BB, Jha SK et al (2009) The origins of microtexture in duplex Ti alloys. Mater Sci Eng A 513–514:325–328. https://doi.org/10.1016/j.msea.2009.02.00310.1016/j.msea.2009.02.003 ↗
23. Dehghan-Manshadi A, Dippenaar RJ (2012) Strain-induced phase transformation during thermo-mechanical processing of titanium alloys. Mater Sci Eng A 552:451–456. https://doi.org/10.1016/j.msea.2012.05.06910.1016/j.msea.2012.05.069 ↗
24. Jackson M, Dashwood RJ, Christodoulou L et al (2002) Isothermal subtransus forging of Ti 6Al–2Sn–4Zr–6Mo. J Light Met 2:185–195. https://doi.org/10.1016/S1471-5317(02)00044-510.1016/S1471-5317(02)00044-5 ↗
25. Alluaibi MH, Rusea A, Cojocaru VD (2018) Influence of thermomechanical processing at temperatures above β-transus on the microstructural and mechanical characteristics of the Ti-6246 alloy. UPB Sci Bull Ser B 80(1):245–258
26. Uginet JF, Albert V (2007) Close die forging of Ti 6246 engine disks. Aubert and Duval Pamiers France, 11th WC Titanium, Kyoto
27. García AMM (2011) BLISK fabrication by linear friction welding. Adv Gas Turbine Tech 18:411–435. https://doi.org/10.5772/2127810.5772/21278 ↗
28. Choda T, Oyama H, Murakami S (2015) Technologies for process design of titanium alloy forging for aircraft parts. Kobelco Tech Rev 33:44–49
29. Cayron C (2007) ARPGE: a computer program to automatically reconstruct the parent grains from electron backscatter diffraction data. J Appl Cryst 40:1183–1188. https://doi.org/10.1107/S002188980704877710.1107/S0021889807048777 ↗
30. Davies PS (2009) An investigation of microstructure and texture evolution in the Near-α Titanium Alloy Timetal ® 834. Ph.D. thesis, Department of Engineering Materials, The University of Sheffield
31. Silva BF, Jackson M, Fox K et al (2023) Tool for automatic macrozone characterization from EBSD data sets of titanium alloys. J Appl Crystallogr 56:737–749. https://doi.org/10.1107/S160057672300386210.1107/S1600576723003862 ↗
32. Gey N, Humbert M (2002) Characterization of variant selection occurring during the α→β→α phase transformations of a cold rolled titanium sheet. Acta Mater 50:277–287. https://doi.org/10.1016/S1359-6454(01)00351-210.1016/S1359-6454(01)00351-2 ↗
33. Singh G, Souza PM (2023) Hot deformation behavior of a novel alpha+beta titanium alloy TIMETAL®407. J Alloys Compd 935:167970. https://doi.org/10.1016/j.jallcom.2022.16797010.1016/j.jallcom.2022.167970 ↗
34. Lypchanskyi O, Śleboda T, Wojtaszek M et al (2021) The analysis of flow behavior of Ti–6Al–2Sn–4Zr–6Mo alloy based on the processing maps. Int J Mater Form 14:523–532. https://doi.org/10.1007/s12289-019-01533-z10.1007/s12289-019-01533-z ↗
35. Prasad YVRK, Seshacharyulu T (1998) Processing maps for hot working of titanium alloys. Mater Sci Eng A 243(1–2):82–88. https://doi.org/10.1016/S0921-5093(97)00782-X10.1016/S0921-5093(97)00782-X ↗
36. Lin YC, Huang J, He D-G et al (2019) Phase transformation and dynamic recrystallization behaviors in a Ti55511 titanium alloy during hot compression. J Alloys Compd 795:471–482. https://doi.org/10.1016/j.jallcom.2019.04.31910.1016/j.jallcom.2019.04.319 ↗
37. Zhang J-Y, Sun Z-P, Qiu D (2023) Dislocation-mediated migration of the α/β interfaces in titanium. Acta Mater 261:119364. https://doi.org/10.1016/j.actamat.2023.11936410.1016/j.actamat.2023.119364 ↗
38. Qarni MJ, Sivaswamy G, Rosochowski A et al (2017) On the evolution of microstructure and texture in commercial purity titanium during multiple passes of incremental equal channel angular pressing (I-ECAP). Mater Sci Eng A 699:31–47. https://doi.org/10.1016/j.msea.2017.05.04010.1016/j.msea.2017.05.040 ↗
39. Lypchanskyi O, Śleboda T, Łukaszek-Sołek A et al (2021) Application of the strain compensation model and processing maps for description of hot deformation behavior of metastable β titanium alloy. Materials 14(8):2021. https://doi.org/10.3390/ma1408202110.3390/ma14082021 ↗
40. Zyguła K, Lypchanskyi O, Łukaszek-Sołek A et al (2024) A comprehensive study on hot deformation behavior of the metastable β titanium alloy prepared by blended elemental powder metallurgy approach. Metall Mater Trans A 55:933–954. https://doi.org/10.1007/s11661-024-07297-910.1007/s11661-024-07297-9 ↗
41. Jiang Y-Q, Lin YC, Wang G-Q et al (2021) Microstructure evolution and a unified constitutive model for a Ti-55511 alloy deformed in β region. J Alloys Compd 870:159534. https://doi.org/10.1016/j.jallcom.2021.15953410.1016/j.jallcom.2021.159534 ↗
42. Gatina SA, Polyakova VV, Polyakov AV et al (2022) Microstructure and mechanical properties of β-titanium Ti-15mo alloy produced by combined processing including ECAP-conform and drawing. Mater 15(23):8666. https://doi.org/10.3390/ma1523866610.3390/ma15238666 ↗
43. Alaneme KK, Okotete EA (2019) Recrystallization mechanisms and microstructure development in emerging metallic materials: a review. J Sci Adv Mater Devices 4(1):19–33. https://doi.org/10.1016/j.jsamd.2018.12.00710.1016/j.jsamd.2018.12.007 ↗
44. Souza PM, Beladi H, Singh RP et al (2018) An analysis on the constitutive models for forging of TI6AL4V alloy considering the softening behavior. J Materi Eng Perform 27:3545–3558. https://doi.org/10.1007/s11665-018-3402-y10.1007/s11665-018-3402-y ↗
45. Zyguła K, Wojtaszek M, Śleboda T et al (2021) The influence of induction sintering on microstructure and deformation behavior of Ti–5Al–5Mo–5V-3Cr Alloy. Metall Mater Trans A 52:1699–1713. https://doi.org/10.1007/s11661-021-06179-810.1007/s11661-021-06179-8 ↗
46. Muszka K, Lopez-Pedrosa M, Raszka K et al (2014) The impact of strain reversal on microstructure evolution and orientation relationships in Ti–6Al–4V with an initial alpha colony microstructure. Metall Mater Trans A 45:5997–6007. https://doi.org/10.1007/s11661-014-2590-910.1007/s11661-014-2590-9 ↗
47. Muszka K, Madej L, Wynne BP (2016) Application of the digital material representation to strain localization prediction in the two phase titanium alloys for aerospace applications. Arch Civ Mech Eng 16(2):224–234. https://doi.org/10.1016/j.acme.2015.10.00310.1016/j.acme.2015.10.003 ↗