The variation of the unstrained lattice parameter in an AA7010 friction stir weld

Steuwer, A.; Dumont, M.; Peel, Matthew; Preuss, Michael; Withers, Philip J.

doi:10.1016/j.actamat.2007.01.024

Cited by 34 publications

(38 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Measurements were made at both A and D as a microstructural change was expected to occur in the strain free sample as the cooling rate during quenching varied from one end of the post to the other. This effect can be significant as illustrated by Steuwer,Dumont et al 25 for friction stir welds in the alloy 7010.…”

Section: Neutron Diffractionmentioning

confidence: 89%

Influence of quenching and aging on residual stress in Al–Zn–Mg–Cu alloy 7449

Robinson

Tanner

Petegem

et al. 2012

Materials Science and Technology

View full text Add to dashboard Cite

This investigation aimed to quantify the size and distribution of residual stresses remaining in rectilinear aluminium forged alloy blocks after they had been partially and fully heat treated. Various quench conditions were used including water at different temperatures and poly oxyethylene glycol (PAG) in two concentrations. The influence of standard and novel aging procedures including retrogression and reaging has been determined. Residual stresses were characterised using x-ray and neutron diffraction. Residual stress magnitudes were found to vary significantly with rapidity of cooling from the solution treatment temperature with the subsequent aging treatments having a much smaller effect. The influence of the heat treatments on mechanical properties of the alloy was predicted by means of quench factor analysis and measured using indentation hardness and tensile testing. Quench factor analysis is also used to predict the change in lattice parameter arising from different quench paths in the strain free reference samples (d 0 ).

show abstract

Section: Neutron Diffractionmentioning

confidence: 89%

Influence of quenching and aging on residual stress in Al–Zn–Mg–Cu alloy 7449

Robinson

Tanner

Petegem

et al. 2012

Materials Science and Technology

View full text Add to dashboard Cite

show abstract

“…This is likely to change the unstrained (stress-free) lattice spacing d 0 , compared to the unaffected PM. [27] If not accounted for, this local variation may have a significant effect on the calculated strains and may lead to inaccuracies in the residual stresses. [28] In this study, two different methods were used to determine the local variation in d 0 ; their application to the different welds is summarized in Table II. In the first method, a comb-shaped reference sample was cut from the welded plate with its teeth aligned in the normal direction ( Figure 2(a)) and with the teeth small enough that the retained residual stresses are effectively zero.…”

Section: Neutron Diffractionmentioning

confidence: 99%

Mechanical Tensioning of High-Strength Aluminum Alloy Friction Stir Welds

Altenkirch

Steuwer

Peel

et al. 2008

Metall Mater Trans A

View full text Add to dashboard Cite

The extent to which in-situ global mechanical tensioning (GMT) can be used to modify the residual stress state in friction stir (FS) welds is investigated in this article. Residual stress distributions have been determined by synchrotron X-ray and neutron diffraction for four sets of FS welds in high-strength AA7449-W51 and lithium containing AA2199-T8 aerospace aluminum alloys subjected to a systematic range of GMT levels. For the cases studied, the results indicate that the level of residual stresses present in the as-welded state is a function of the alloy. The rate of residual stress reduction brought about by GMT, however, is basically alloy independent; indeed, it is essentially linear with respect to the GMT load, so that the tensioning required to reduce the weld stresses to zero can be calculated directly from the stresses present in the untensioned case. For thin plates, proximity to the yield stress in the hot-softened zone means that a guideline rule is that 1 MPa of tensioning during welding reduces the tensile stress by approximately 1 MPa. The GMT was found to be less effective at greater depths in thick plates. Furthermore, a reduction in bending distortion and an increase in angular distortion was observed with increased GMT, while no effects on the weld microstructure and hardness were observed.

show abstract

“…The ϕ = 0 • and 90 • measurement process requires no prior knowledge of the in-plane principal stresses. A good example is provided by the measurement of the local variation in lattice parameter across a friction stir weld of 13 mm thick Al 7010 alloy plate [11]. A 1 mm thick cross-sectional slice was cut mid-way along the FSW in order to use the transmission sin 2 ψ method, and the variation in d 0 mapped across the weld in Figure 7.12.…”

Section: Powders Filings Cubes and Combsmentioning

confidence: 99%

Synchrotron X‐ray Diffraction

Withers

2013

Practical Residual Stress Measurement Methods

View full text Add to dashboard Cite

The variation of the unstrained lattice parameter in an AA7010 friction stir weld

Cited by 34 publications

References 18 publications

Influence of quenching and aging on residual stress in Al–Zn–Mg–Cu alloy 7449

Influence of quenching and aging on residual stress in Al–Zn–Mg–Cu alloy 7449

Mechanical Tensioning of High-Strength Aluminum Alloy Friction Stir Welds

Synchrotron X‐ray Diffraction

Contact Info

Product

Resources

About