Effect of post-weld heat treatment on mechanical properties of gas-tungsten arc welds of Al-Li alloy 8090

Ravindra, A.; Dwarakadasa, E. S.

doi:10.1007/bf00729285

Cited by 8 publications

(5 citation statements)

References 3 publications

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“…Whilst the tensile strength is not greatly affected by heat treatment, both toughness and ductility are improved [5]. Kozuh et al [6] had concluded that hardness values are lower at base metal after PWHT but with no fixed trend.…”

Section: Introductionmentioning

confidence: 99%

“…Some hardness test results, however, were not consistent. Kozuh et al [6] and Ravindra and Dwarakadasa [5] reported that there are ductile and cleavage fractures at fracture locations of Charpy impact test specimens. Olabi et al [8] in his two researches involving MIG welding of AISI 1020 found out that residual stress and hardness value decreases with increasing PWHT temperature but impact energy increase with increasing PHWT temperature.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and Mechanical Properties Evaluations of Heat Treated Dissimilar Metal Joint Weldment between API 5CT C90 and ASTM A182 F22

Awang

Othman

Shaari

et al. 2012

DDF

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In this research, post-weld heat treatment (PWHT) of dissimilar API 5CT C90 and ASTM A182 F22 welded pipe was carried out at temperatures of 500, 600, 700 and 800°C. The effects of PWHT on the microstructure and mechanical properties of the weldment were investigated. The mechanical tests and microstructure examinations were focused on the fusion line area of API 5CT C90 as this area is the most crucial part of the weldment. The main objective of this research is to assess the microstructure and mechanical properties of the dissimilar weldment. The results were then compared with NACE MR0175/ISO15156 code which requires hardness values below 275 Hv10 at a cap, below 250 Hv10 at a root and an average value 42 Joules at-20°C for charpy impact test [. The experimental results show that PWHT reduces the hardness value and increase the toughness of the weldment. Meanwhile, the optical microscopic examination shows that the higher the PWHT temperature, the coarser the grain size. The results showed that the 800°C PWHT specimen complied with the code.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties Evaluations of Heat Treated Dissimilar Metal Joint Weldment between API 5CT C90 and ASTM A182 F22

Awang

Othman

Shaari

et al. 2012

DDF

View full text Add to dashboard Cite

show abstract

“…Research results indicate that if the common fusion welding processes such as tungsten inert gas arc welding (TIG) and metal inert gas arc welding (MIG) are used to weld Al-Li alloys, some technical problems may occur, for example, coarse grain in weldment, great susceptibility to hot cracking, high porosity of weld metal (WM), softening of heat-affected zone (HAZ), etc [4,5], therefore the application of Al-Li alloys is limited to a certain extent.…”

Section: Introductionmentioning

confidence: 99%

“…At present, some investigations have been done on PWHT of Al-Li alloys joints [5,6], while there are very few literatures reporting about the PWHT of Al-Li alloys joints with EBW. Based on these, the PWHT of 1420 Al-Li alloy joint with EBW is carried out, the effect of PWHT on microstructure of Al-Li alloy joints is analyzed systematically, and the precipitation types of strengthening phases in weldment and the distribution pattern of dislocations are discussed, which is expected to provide technical guidance for practical use.…”

Section: Introductionmentioning

confidence: 99%

Microstructure of Al-Li Alloy Electron Beam Welding Joint after Post-Weld Heat Treatment

Wang

Kobayashi

Luo

et al. 2012

AMM

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Heat treatment was carried out to the 1420 Al-Li alloy electron beam welding (EBW) joints after welding, and the microstructures of welded joints are analyzed systematically before and after post-weld heat treatment (PWHT). The observation of joint microstructure demonstrates that the grain morphology of weldment changes from equiaxed dendrites in as-welded (AW) condition into equiaxed grains after PWHT, and that the fine strengthening phases precipitate within the grain. The XRD analysis of phase constituent and TEM observation of weldment indicate that the main strengthening phases in 1420 Al-Li alloy weldment are spheroidal δ′(Al3Li), β′(Al3Zr) and rod-like T(Al2MgLi) after PWHT. Furthermore, the δ′ phase precipitate free zone (PFZ) is found along the grain boundary. The scanning observation of joint fracture shows that Al-Li alloy EBW joint presents the characteristic of transgranular ductile fracture in AW condition. After PWHT, the Al-Li alloy welded joint presents the pattern of intergranular fracture. The variation of fracture mode is related to dispersed precipitation of δ′ phase and the formation of PFZ at the grain boundary in weldment after heat treatment.

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“…Due to their global properties of low density, high specific strength and stiffness, low temperature property and corrosion resistance, and super-plasticity, Al-Li alloys have extensive application prospects in many industry fields such as aviation and aerospace, etc [1]. In the industry production, if rivet structure is replaced by weld structure, it can greatly decrease the weight of components and lower the production cost.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation on Electron Beam Welding Temperature Field of Al-Li Alloy

Wang

Kobayashi

Xing

2011

AMR

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The numerical simulation of electron beam welding temperature field for 2090 Al-Li alloy sheet of 2 mm thickness is conducted by using the ANSYS software. The combined model of Gauss surface heat source with cylindrical body heat source in linear attenuation is used according to the unique nail-shaped weld of electron beam welding joint, and the distribution cloud image of temperature field and the instantaneous weld thermal cycle curves of Al-Li alloy electron beam welding are obtained through calculation. The effect of welding parameters such as electron beam power and welding speed on the distribution of temperature field and weld width is investigated. Results show that electron beam welding has a very high rate of both temperature ascending and descending, and the rate of temperature ascending is higher than that of descending. With the increase of electron beam power or decrease of welding speed, the temperature of fusion zone elevates, and the weld width increases. The appearance of weld obtained through numerical simulation is greatly consistent with the practical welding.

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Effect of post-weld heat treatment on mechanical properties of gas-tungsten arc welds of Al-Li alloy 8090

Cited by 8 publications

References 3 publications

Microstructure and Mechanical Properties Evaluations of Heat Treated Dissimilar Metal Joint Weldment between API 5CT C90 and ASTM A182 F22

Microstructure and Mechanical Properties Evaluations of Heat Treated Dissimilar Metal Joint Weldment between API 5CT C90 and ASTM A182 F22

Microstructure of Al-Li Alloy Electron Beam Welding Joint after Post-Weld Heat Treatment

Numerical Simulation on Electron Beam Welding Temperature Field of Al-Li Alloy

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