Effects of post-weld heat treatment on fracture toughness of linear friction welded joint for dissimilar titanium alloys

Tao, Bohao; Li, Q.; Zhang, Y.H.; Zhang, T.C.; Liu, Y.

doi:10.1016/j.msea.2015.03.003

Cited by 27 publications

(8 citation statements)

References 12 publications

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“…The application of thermal treatments to LFW joints and their subsequent mechanical properties have already been assessed in literature. For instance, Tao et al [24] carried out impact fracture toughness tests using specimens having notches centred at characteristics weld zones of dissimilar Ti17-Ti64 LFW joints, in the AW conditions and after two annealing thermal treatments. It has been shown that the reduced impact fracture toughness of the TMAZ and WCZ on the Ti17 side was increasingly improved with increasing annealing temperature.…”

Section: Introductionmentioning

confidence: 99%

On the effect of a thermal treatment on the tensile and fatigue properties of weak zones of similar Ti17 linear friction welded joints and parent material

García

Gaslain

Morgeneyer

2020

Materials Characterization

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The tensile and fatigue properties and the damage mechanisms of as welded (LFW-AW) and post-weld heat treated (PWHT) similar Ti17 linear friction welded (LFW) joints as well as Ti17 parent material (PM) have been studied together with their underlying microstructures.The LFW-AW joints exhibited a depletion of the α phases in the weld centre zone (WCZ) and in the thermo-mechanically affected zone (TMAZ), which was previously qualified as a weak zone. Stereo Digital Image Correlation (SDIC) analysis of the strain field for monotonic loading of the PM showed strain heterogeneity that was linked by EBSD and Schmid s factor analysis to the large β grains containing α precipitates. Compared to the PM tensile specimens, the LFW-AW joint highlighted lower ultimate tensile strength (UTS) and a strongly reduced and scattered macroscopic ductility. Maps and spatio-temporal graphs of normalized strain rate fields obtained by SDIC clearly highlighted localization at the weak zone. For the target fatigue life of 10 5 cycles, the fatigue strength of the AW joint was about half that of the PM with fatigue crack initiation at the β grain boundary in the weak zones. Remarkably, the PWHT made the AW joints comparable to the PM in terms of microstructure and mechanical properties. The former weak zones recrystallized into β grains with α, the UTS and fatigue strength were almost recovered, macroscopic and local ductility were enhanced, failure during monotonic and cyclic loadings occurred far from the former weak zones.

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Section: Introductionmentioning

confidence: 99%

On the effect of a thermal treatment on the tensile and fatigue properties of weak zones of similar Ti17 linear friction welded joints and parent material

García

Gaslain

Morgeneyer

2020

Materials Characterization

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“…They are applied in various fields such as thermal power station, nuclear industries, automobile, aerospace, etc. A number of dissimilar joints with aluminum, titanium, ferrous and many kinds of materials have been successfully formed by various methods from fusion welding to friction welding process [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…As design complexity and service demands increase, dissimilar welds with titanium alloys become a particular interest in the field of aerospace industry [3][4][5]. There have been a number of studies reporting the welding of dissimilar titanium alloys using various different welding processes, including friction stir welding [3], ultrasonic spot welding [4], linear friction welding (LFW) [5,6], tungsten inert gas welding [7] and electron beam welding [8].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Friction Welding Joints with Dissimilar Titanium Alloys

Zhao

2016

Metals

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Titanium alloys, which are important in aerospace application, offer different properties via changing alloys. As design complexity and service demands increase, dissimilar welding of the titanium alloys becomes a particular interest. Linear friction welding (LFW) is a relatively novel bond technique and has been successfully applied for joining titanium alloys. In this paper, dissimilar joints with Ti-6Al-4V and Ti-5Al-2Sn-2Zr-4Mo-4Cr alloys were produced by LFW process. Microstructure was studied via optical microscopy and scanning electron microscopy (SEM), while the chemical composition across the welded samples was identified by energy dispersive X-ray spectroscopy. Mechanical tests were performed on welded samples to study the joint mechanical properties and fracture characteristics. SEM was carried out on the fracture surface to reveal their fracture modes. A significant microstructural change with fine re-crystallization grains in the weld zone (WZ) and small recrystallized grains in the thermo-mechanically affected zone on the Ti-6Al-4V side was discovered in the dissimilar joint. A characteristic asymmetrical microhardness profile with a maximum in the WZ was observed. Tensile properties of the dissimilar joint were comparable to the base metals, but the impact toughness exhibited a lower value.

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“…For welding of metals, as is well known, the tensile strength and elongation of as-welded joints are lower than those of the base metal. Fortunately, many researchers have found that the mechanical properties of welded joints can be improved by PWHT in some metals [ 9 , 10 ]. Wang et al (2017) [ 11 ] researched the effects of aging treatments on the mechanical properties of Al-Cu-Li alloy joints and found that the strength coefficient of the joints increased from 0.64 to 0.90 after post weld double aging treatment.…”

Section: Introductionmentioning

confidence: 99%

Improving Mechanical Properties of PVPPA Welded Joints of 7075 Aluminum Alloy by PWHT

Chen

Han

et al. 2018

Materials

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In this study, 7075 aluminum alloy with a thickness of 10 mm was successfully welded with no obvious defects by pulsed variable polarity plasma arc (PVPPA) welding. The mechanical properties of PVPPA welded joints have been researched by post weld heat treatment (PWHT). The results indicate that the heat treatment strongly affects the mechanical properties of the welded joints. The tensile strength and the microhardness of the welded joints gradually improved with the increase of the solution temperature. With the increase of the solution time, the tensile strength, and microhardness first dramatically increased and then decreased slightly. The best tensile strength of 537.5 MPa and the microhardness of 143.7 HV were obtained after 490 °C × 80 min + 120 °C × 24 h, and the strength was nearly 91.2% of that of the parent metal, and increased about 35% compared with as-welded. The improvement of strength and microhardness was mainly due to the precipitation of η′ phase.

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Effects of post-weld heat treatment on fracture toughness of linear friction welded joint for dissimilar titanium alloys

Cited by 27 publications

References 12 publications

On the effect of a thermal treatment on the tensile and fatigue properties of weak zones of similar Ti17 linear friction welded joints and parent material

On the effect of a thermal treatment on the tensile and fatigue properties of weak zones of similar Ti17 linear friction welded joints and parent material

Microstructure and Mechanical Properties of Friction Welding Joints with Dissimilar Titanium Alloys

Improving Mechanical Properties of PVPPA Welded Joints of 7075 Aluminum Alloy by PWHT

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