When hydrogen is dissolved, brittleness occurs in the material. However, in the case of titanium and titanium alloy, hydrogen can be temporarily dissolved and removed, thereby improving the mechanical properties of titanium and titanium alloy. In this study, Core time Hydrogen Heat treatment (CHH) applies to Ti–6Al–4V alloy to improve mechanical properties. CHH was performed at 800°C and 1000°C for 2 h. Thereafter, dehydrogenation was performed for 2 h at 700°C in vacuum atmosphere to remove residual hydrogen. After the CHH at 800°C, it was found that the α-lath size in the Ti–6Al–4V was narrowed; thereby increasing the Vickers hardness and tensile strength without decreasing in elongation.
EliezerDTal-GutelmacherECrossCEHydrogen absorption and desorption in a duplex-annealed Ti-6Al-4V alloy during exposure to different hydrogen-containing environments. Mater Sci Eng A. 2006; 433(1–2):298–304. doi: 10.1016/j.msea.2006.06.088
3.
SenkovONFroesFH.Thermohydrogen processing of titanium alloys. Int J Hydrog Energy. 1999; 24:565–576. doi: 10.1016/S0360-3199(98)00112-8
4.
ZhangYZhangSQ.Hydrogenation characteristics of Ti-6Al-4V cast alloy and its microstructural modification by hydrogen treatment. Int J Hydrog Energy. 1997; 22:161–168. doi: 10.1016/S0360-3199(96)00167-X
5.
SenkovONJonasJJFroesFH.Recent advances in the thermohydrogen processing of titanium alloys. JOM. 1996; 48:42–47. doi: 10.1007/BF03222997
6.
ChenCQLiSXZhengHAn investigation on structure, deformation and fracture of hydrides in titanium with a large range of hydrogen contents. Acta Mater. 2004; 52:3697–3706. doi: 10.1016/j.actamat.2004.04.024
7.
ZhuTLiM.Lattice variations of Ti-6Al-4V alloy with hydrogen content. Mater Charact. 2011; 62:724–729. doi: 10.1016/j.matchar.2011.04.019
8.
SenkovONChakoumakosBCJonasJJEffect of temperature and hydrogen concentration on the lattice parameter of beta titanium. Mater Res Bull. 2001; 36:1431–1440. doi: 10.1016/S0025-5408(01)00604-3
9.
QaziJISenkovONRahimJPhase Transformations in Ti-6Al-4V-xH alloys. Metall Mater Trans A Phys Metall Mater Sci. 2001; 32A:2453–2463. doi: 10.1007/s11661-001-0035-8
10.
AzevedoCRFRodriuesDBeneduce NetoF.Ti-Al-V powder metallurgy (PM) via the hydrogenation-dehydrogenation (HDH) process. J Alloy Compd. 2003; 353:217–227. doi: 10.1016/S0925-8388(02)01297-5
11.
McQuillanAD.An experimental and thermodynamic investigation of the hydrogen-titanium system. Proc R Soc Lond A Math Phys Sci. 1950; 204:309–323.
12.
LenningGACraigheadCMJaffeeRI.Constitution and mechanical properties of titanium-hydrogen alloys. JOM. 1954; 6:367–376. doi: 10.1007/BF03398020
13.
LiuCTWuTIWuJK.Formation of nanocrystalline structure of Ti-6Al-4V alloy by cyclic hydrogenation-dehydrogenation treatment. Mater Chem Phys. 2008; 110:440–444. doi: 10.1016/j.matchemphys.2008.02.034
14.
FangTYWangWH.Microstructure features of thermochemical processing in a Ti-6Al-4V alloy. Mater Chem Phys. 1998; 56:35–47. doi: 10.1016/S0254-0584(98)00137-0
15.
ZongYWuK.Thermo hydrogen treatment for microstructure refinement and mechanical properties improvement of Ti-6Al-4V alloy. Mater Sci Eng A Struct Mater. 2017; 703:430–437. doi: 10.1016/j.msea.2017.07.076
16.
ChangYBreenAJTarzimoghadamZCharacterizing solute hydrogen and hydrides in pure and alloyed titanium at the atomic scale. Acta Mater. 2018; 150:273–280. doi: 10.1016/j.actamat.2018.02.064
17.
FangZZSunPWangH.Hydrogen sintering of titanium to produce high density fine grain titanium alloys. Adv Eng Mater. 2012; 14:383–387. doi: 10.1002/adem.201100269
18.
CaoFRavi ChandranKSKumarP.New approach to achieve high strength powder metallurgy Ti-6Al-4V alloy through accelerated sintering at β-transus temperature and hydrogenation-dehydrogenation treatment. Scr Mater. 2017; 130:22–26. doi: 10.1016/j.scriptamat.2016.11.005
EliazNEliezerDOlsonDL.Hydrogen-assisted processing of materials. Mater Sci Eng A Struct Mater. 2000; 289:43–53. doi: 10.1016/S0921-5093(00)00906-0
21.
ZongYYShanDBLuYEffect of 0.3 wt% H addition on the high temperature deformation behaviors of Ti–6Al–4 V alloy. Int J Hydrog Energy. 2007; 32:3936–3940. doi: 10.1016/j.ijhydene.2007.04.032
22.
OhJMKooJGLimJW.Enhanced densification and hardness of titanium bodies sintered by advanced hydrogen sintering process. Met Mater Int. 2018; 24:1303–1308. doi: 10.1007/s12540-018-0134-3
23.
KuJGOhJMKwonHJHigh-temperature hydrogen-reduction precess for the preparation of low-oxygen Mo powder form MoO3. Int J Hydrog Energy. 2017; 42:2139–2143. doi: 10.1016/j.ijhydene.2016.09.004
24.
GuiYWOhJMLimJW.Sintering properties of Ti-27Nb alloys prepared by using Ti/TiH2 powders under argon and hydrogen sintering processes. Powder Technol. 2018; 339:775–780. doi: 10.1016/j.powtec.2018.08.022
25.
OhJMKooJGLimJW.Enhanced densification and hardness of titanium bodies sintered by advanced hydrogen sintering process met. Mater. -int. 2018; 24:1303–1308. doi: 10.1007/s12540-018-0134-3
26.
ChoGHOhJMLimJW.Lattice deformation and improvement oxidation resistance of Ti-6Al-4V alloy powders prepared by hydrogen added argon heat treatment. J Korean Powder Metall Inst. 2019; 26:1–6. doi: 10.4150/KPMI.2019.26.1.1
27.
SunPFangZZKoopmanMAn experimental study of the (Ti-6Al-4V)-xH phase diagram using in situ synchrotron XRD and TGA/DSC techniques. Acta Mater. 2015; 84:29–41. doi: 10.1016/j.actamat.2014.10.045
YuanBGYuHPLiCFEffect of hydrogen on fracture behavior of Ti-6Al-4V alloy by in-situ tensile test. Int J Hydrog Energy. 2010; 35:1829–1838. doi: 10.1016/j.ijhydene.2009.12.053
30.
ChaLScheuCClemensHNanometer-scaled lamellar microstructures in Ti-45Al-7.5Nb-(0; 0.5)C alloys and their influence on hardness. Intermetallics. 2008; 16:868–875. doi: 10.1016/j.intermet.2008.03.009
31.
ZhangCKangQLaiZThe microstructural modification, lattice defects and mechanical properties of hydrogenated/dehydrogenated α-Ti. Acta Mater. 1996; 44:1077–1084. doi: 10.1016/1359-6454(95)00211-1
32.
SinghGBajarganGDattaREffect of hydrogen charging on tensile properties of B-modified Ti-6Al-4V alloy. Mater Sci Eng A Struct Mater. 2013; 576:326–336. doi: 10.1016/j.msea.2013.04.011
33.
MalinovSMarkovskyPShaWResistivity study and computer modelling of the isothermal transformation kinetics of Ti-6Al-4V and Ti-6Al-2Sn-4Zr-2Mo-0.08Si alloys. J Alloys Compd. 2001; 314:181–192. doi: 10.1016/S0925-8388(00)01227-5
34.
ShenCCWangCM.Effects of hydrogen loading and type of titanium hydride on grain refinement and mechanical properties of Ti-6Al-4V. J Alloys Compd. 2014; 601:274–279. doi: 10.1016/j.jallcom.2014.02.171
35.
YoshimuraHKimuraKHayashiMUltra-fine equiaxed grain refinement and improvement of mechanical properties of α+β type titanium alloys by hydrogenation, hot working, heat treatment and dehydrogenation. Mater Trans JIM. 1994; 35:266–272. doi: 10.2320/matertrans1989.35.266
36.
MontanariRCostanzaGTataMELattice expansion of Ti-6Al-4V by nitrogen and oxygen absorption. Mater Charact. 2008; 59:334–337. doi: 10.1016/j.matchar.2006.12.014
37.
OhJMLeeBGChoSWOxygen effects on the mechanical properties and lattice Strain of Ti and Ti-6Al-4V Met. Mater. -int. 2011; 17:733–736. doi: 10.1007/s12540-011-1006-2
