Effect of pre- and post-weld heat treatments on the mechanical properties of electron beam welded Ti-6Al-4V alloy

Thomas, George J.; Ramachandra, V.; Ganeshan, R.; Vasudevan, R.

doi:10.1007/bf00361152

Cited by 50 publications

(28 citation statements)

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“…EBW was created in 1950's and used in nuclear industry. Because it could be achieved the highest precision in position and formed the highest depth-to-width ratio of weld, it could also be applied, undoubtedly, in the industry of aerospace and national defense [9]. In the early stage of EBW development, its equipments which required high vacuum level were not used extensively because of the high cost and low productivity.…”

Section: Introductionmentioning

confidence: 99%

Characterization on electron beam welds and parameters for AZ31B-F extrusive plates

Chi

Chao

2007

Journal of Materials Processing Technology

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Section: Introductionmentioning

confidence: 99%

Characterization on electron beam welds and parameters for AZ31B-F extrusive plates

Chi

Chao

2007

Journal of Materials Processing Technology

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“…The hardening efect observed in the FZ after SRA1 annealing can be atributed to tempering of the martensitic structure. This efect at relatively low temperatures has already been observed by a number of researchers [6,30,31]. Because metastable ' martensite is supersaturated in stabilizers owing to the difusionless transformation → ', upon annealing, it decomposes into + by precipitation of incoherent particles at dislocations or phase layers at plate boundaries [28].…”

Section: Inluence Of Pwht On Microhardnessmentioning

confidence: 78%

Effect of Microstructure Transformations on Fatigue Properties of Laser Beam Welded Ti‐6Al‐4V Butt Joints Subjected to Postweld Heat Treatment

Fomin¹,

Ventzke²,

Dorn³

et al. 2017

Study of Grain Boundary Character

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The efect of postweld heat treatment PWHT) on 2.6-mm-thick Ti-6Al-4V but joints that were welded using a continuous-wave 8-kW yterbium ibre laser was studied in terms of the microstructure, microtexture, number of welding defects, microhardness, residual stress distribution and high cycle fatigue HCF) properties. Five types of heat treatments in the temperature range of 540-920°C are investigated. The main reasons leading to fatigue life deterioration after the laser welding process are discussed, and possible guidelines for further improvement of the HCF behaviour by a subsequent suitable type of PWHT are provided. Low-temperature annealing T < 600°C) tends to harden both the base material and the welding zone without any signiicant efect on the fatigue properties. Heat treatments at higher temperatures T > 50°C) lead to the transformation of a strong martensitic structure in the fusion zone FZ) into more ductile coarse lamellar, which is more beneicial for fatigue performance. A suitable type of PWHT can increase the fatigue limit of a laser-welded Ti-6Al-4V but joint by 10%; however, a slight decrease in static strength should be considered. The efect of stress relief at elevated temperatures is studied.

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“…[6] [7] The initial conditions are concerned with the initial volume of the bubble or the initial radius (r g (0), equal to the primary cavity volume), with the amount of gas contained in the primary pore (n g (0), Table VI) and with the initial bubbleradius rate (set to zero). As the diffusion of element throughout the bubble is considered negligible, the amount of gas will remain constant, and the notation n g will be used instead of n g (0).…”

Section: Governing Equationsmentioning

confidence: 99%

“…Concerning safety requirements, pores have been identified as the most sensitive defects. [1][2][3][4][5][6][7][8] Previous studies on the origin of pores in titanium and titanium alloys in tungsten inert-gas welding and EB welding processes lead to the following main conclusions.…”

Section: Introductionmentioning

confidence: 98%

Assessment of the origin of porosity in electron-beam-welded TA6V plates

Gouret

Ollivier

Dour

et al. 2004

Metall Mater Trans A

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Experimental and theoretical analysis of the origin of porosity in electron-beam (EB) welding is detailed. The experiments are run with several surface treatments and reasonable welding parameters. The plate faces are characterized before welding with a number of methods, such as scanning electron microscope observation, X-ray photoemission spectroscopy (XPS) and, more significantly, secondary ion mass spectroscopy (SIMS) analysis, elastic-recoil detection analysis (ERDA) for hydrogen analysis, and surface roughness measurement. After welding, pores are sought with X-ray detection, phased-array ultrasonic (US) detection, and destructive control. An original comparison between ERDA and refined SIMS measurements allows a quantitative evaluation of surface pollution with hydrogen, oxygen, and carbon. The theoretical analysis is based on the literature concept that the cavities are nucleated from the adjacent plate faces in the solid state, just before melting. A less classical development is proposed in term of the evolution of bubbles in the weld pool. Once in the liquid, the cavities become bubbles. Their radius oscillates, according to Rayleigh-Plesset equations of bubbles, due to temperature and pressure driving forces. Solidification freezes them as they are, thus, forming pores. The extreme values of the oscillation give a good idea of the range of the size of pores in the weld joint, as the comparison between experiments and prediction states. A criterion of surface cleanliness is set, relating the surface pollution and the surface roughness. Above the criterion, the bubbles remain small during their oscillation. Below the criterion they tend to grow large. All the degraded-surface treatments are in dirty situation (large pores), and the reference surface treatment lies around the criterion for cleanliness.

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Effect of pre- and post-weld heat treatments on the mechanical properties of electron beam welded Ti-6Al-4V alloy

Cited by 50 publications

References 1 publication

Characterization on electron beam welds and parameters for AZ31B-F extrusive plates

Characterization on electron beam welds and parameters for AZ31B-F extrusive plates

Effect of Microstructure Transformations on Fatigue Properties of Laser Beam Welded Ti‐6Al‐4V Butt Joints Subjected to Postweld Heat Treatment

Assessment of the origin of porosity in electron-beam-welded TA6V plates

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