The effect of post-weld heat treatment on the notched tensile fracture of Ti–6Al–4V to Ti–6Al–6V–2Sn dissimilar laser welds

Hsieh, Chia-Lung; Chu, C.Y.; Shiue, Ren-Kae; Tsay, L.W.

doi:10.1016/j.matdes.2014.02.055

Cited by 23 publications

(11 citation statements)

References 21 publications

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“…8c) [41]. An increase in the PWHT temperature beyond 480 °C resulted in a reduction in the FZ hardness of Ti-6-4/Ti-15-3 [41], Ti-6-4/Ti-6-6-2 [39], Ti-6-4/SP700 [40] DTWs as shown in Fig. 7.…”

Section: Aging and Post-weld Heat Treatments (Pwht)mentioning

confidence: 84%

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Influence of welding process on the properties of dissimilar titanium alloy weldments: a review

Junaid

Cheema

2020

JMST Adv.

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The extensive use of titanium alloys in a variety of complex industrial applications may be attributed to their properties of high strength-to-weight ratio, corrosion resistance and high temperature strength. Recently, the use of dissimilar titanium alloys has become popular to achieve contrasting characteristics in a single unit. In the fabrication of the structures, joining methods such as welding hold the key in the attainment of the desired characteristics. The present study is aimed at reviewing various state-of-the-art processes used for welding of dissimilar titanium alloys. In particular, the influence of different welding methods such as gas tungsten arc welding (GTAW), laser and electron beam welding on the microstructure, mechanical properties and other characteristics of dissimilar weldments of α, α + β and β titanium alloys has been emphasized. The underlying phenomena that govern the effect of weld processing parameters on the mechanical strength, microstructure and weld joint quality of the alloys were exploited. Moreover, detailed investigations on the fusion zone porosities and evolution of intermetallic concept at the interfacial regions have been examined. Furthermore, different remedial approaches to enhance the joint quality such as beam offsetting, process hybridization, aging and post-weld heat treatments are investigated thoroughly. The latest trends in dissimilar welding of titanium alloys to upheave further research in this area have been reported in the context of their application in industrial applications.

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Section: Aging and Post-weld Heat Treatments (Pwht)mentioning

confidence: 84%

“…To further understand this phenomenon, consider the TEM micrographs (Fig. 8) of the FZ of Ti-6-4/Ti-6-6-2 DTWs [39] in which the α-colony for the as-welded and the heat-treated (at 480 °C) samples is examined. In the as-welded condition, the area between the α-laths is comprised of β-phase only (Fig.…”

Section: Aging and Post-weld Heat Treatments (Pwht)mentioning

confidence: 99%

Influence of welding process on the properties of dissimilar titanium alloy weldments: a review

Junaid

Cheema

2020

JMST Adv.

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“…In the L-HAZ, as the distance between the base metal and the fusion line decreased, the prior β phase gradually transformed into the secondary α' phase. This was mainly because of the peak heating temperature, which is assumed to be lower than the β transition temperature and that the temperature of the L-HAZ reached the zone of the α and β phase transition temperature [31,32]. As the temperature in the L-HAZ was not high enough and the retention time was not long enough, the microstructure consisted of α and β phase under a high temperature and The L-HAZ extends from a position where the weld thermal cycle has no observable effect on the original microstructure to a position where the temperature is lower than the β transition temperature.…”

Section: Microstructural Characterizationmentioning

confidence: 99%

Laser Welding of BTi-6431S High Temperature Titanium Alloy

Zeng

Oliveira

et al. 2017

Metals

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Abstract:A new type of high temperature titanium alloy, BTi-6431S, has recently become the focus of attention as a potential material for aircraft engine applications, which could be used up to 700 • C. Pulsed laser welding was used to butt join the BTi-6431S titanium alloy in order to understand the feasibility of using fusion-based welding techniques on this material. The effect of laser energy on the microstructure and mechanical properties of the joints was investigated. The microstructural features of the joints were characterized by means of microscopy and X-ray diffraction. Tensile testing was conducted at both room temperature and high temperature to simulate potential service conditions. The results show that the microstructure of the laser welded joints consists of primary α phase and needle α' phase, while the microstructure of the heat affected zone consists of α, β, and needle α' phases. The tensile strength of the welded joints at room temperature was similar to that of the base material, despite a reduction in the maximum elongation was observed. This was related to the unfavorable microstructure in the welded joints. Nonetheless, based on these results, it is suggested that laser welding is a promising joining technique for the new BTi-6431S titanium alloy for aerospace applications.

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“…Titanium and steel [24][25][26][27], aluminum and magnesium [28,29], and titanium and aluminum, [30][31][32][33] have been successfully welded with appropriate welding parameters for their surface and subsurface properties analysis. However, the FSW of dissimilar titanium alloys remain untouched, with the exception of a few studies of the laser welding of Ti 6 Al 4 V and Ti 6 Al 6 V 2 Sn by Hsieh et al [34]. Although, Jata et al have successfully joined 2 mm thick sheets of Ti 17 , and Ti 6 Al 4 V by FSW and presented the microstructural and mechanical properties [35], the detailed analysis of the material flow, study of migration of elements, effect of interchanging of alloying sheets, and corresponding mechanical properties have not yet been investigated so far.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Friction Stir Welded Dissimilar Titanium Alloys: TIMET-54M and ATI-425

Gangwar

Cantrell

Sanders

2016

Metals

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Weight reduction in automobiles and in aerospace industries can profoundly register for the behemoth change in the consumption of the fossil fuels and, in turn, CO 2 emission. With a promising hope in hindsight for weight reduction, we have successfully produced butt joints of friction stir welded (FSWed) dissimilar, and rather novice, α-β titanium alloys-ATI-425 and TIMET-54M. The study presented in this article encompasses the microstructural and mechanical properties of the joints for two cases, (1) ATI-425 on the advancing side; and (2) TIMET-54M on the advancing side. The evolution of microstructure and concomitant mechanical properties are characterized by optical microscopy, microhardness, and tensile properties. A detailed description of the microstructural evolution and its correlation with the mechanical properties have been presented in this study. Our investigations suggest that mixing patterns are dependent on the location (advancing, or retreating) of the alloying sheet. However, the microstructure in the weld nugget (WN) is quite similar (grain boundary α, and basket weave morphology consisting of α + β lamellae) in both cases with traces of untransformed β. The thermo-mechanically affected zone (TMAZ) on the either side of the weld is primarily affected by the microstructure of the base material (BM). A noticeable increase in the hardness values in the WN is accompanied by significant deflection on the advancing and retreating sides. The tensile properties extracted from the global stress strain curves are comparable with minimal difference for both cases. In both cases, the fracture occurred on the retreating side of the weld.

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The effect of post-weld heat treatment on the notched tensile fracture of Ti–6Al–4V to Ti–6Al–6V–2Sn dissimilar laser welds

Cited by 23 publications

References 21 publications

Influence of welding process on the properties of dissimilar titanium alloy weldments: a review

Influence of welding process on the properties of dissimilar titanium alloy weldments: a review

Laser Welding of BTi-6431S High Temperature Titanium Alloy

Microstructure and Mechanical Properties of Friction Stir Welded Dissimilar Titanium Alloys: TIMET-54M and ATI-425

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