The Effect of Variations in Heat Treatment on the Mechanical Properties of an α+ß Titanium Alloy IMI 550 (Ti-4A1-2Sn-4Mo-0.5Si)

Vaughan, R. F.; Blenkinsop, P. A.; Neal, D. F.

doi:10.1007/978-1-4757-1758-7_39

Cited by 1 publication

(3 citation statements)

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“…Measurements were carried out on one as-welded and three differently post weld heat treated samples (temperatures of the PWHT between the typical aging and annealing temperatures for IMI550 according to Ref. [6]). …”

Section: Discussionmentioning

confidence: 99%

“…One sample was used for measuring the residual stresses in the as-welded condition (SI). Three welded samples (S2-S4) were PWHT'd at different temperatures comprising the optimum temperature range between aging and annealing for IMI550 [6]. All heat treatments were carried out in a tube furnace under argon atmosphere.…”

Section: Methodsmentioning

confidence: 99%

“…In this case, the corrected stressfree lattice parameter was used for calculating the residual stresses. Figure 5a- Residual stress relief could be improved by using PWHT temperatures closer to the typical anneahng temperature of IMI550 (700°C [6]). A temperature increase by 100°C compared to the conventional aging temperature results in a significant stress relief during PWHT with stresses not exceeding 150 MPa in the axial and hoop direction (130 MPa in the radial direction).…”

Section: Residual Stresses Measured By Synchrotron Diffractionmentioning

confidence: 97%

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Residual Stresses in Linear Friction Welded IMI550

Preuss

Fonseca

Steuwer

et al. 2004

Journal of Neutron Research

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Residual stresses in linear friction welded (LFW) IMI550 have been determined by means of high energy synchrotron X-ray diffraction. Specimens were studied in the as-welded, and three different post weld heat treated conditions. Mid-thickness-mid-width line scans were recorded across the weld line in the three principal directions of the welds. For calculating the nominal residual strain the "stress-free" lattice spacing was taken from far field measurements. The separation of a chemical induced and strain induced shift of the reflection was carried out by determining the variation of the rf-spacing across the weld line. This was done on thin slices cut from the centre region of a LFW sample using the biaxial sin^i/i-technique on a collimated laboratory X-ray source.Results show large tensile stresses close to the weld line for the as-welded sample and the sample post weld heat treated at the aging temperature typical of IMI550. Moderate residual stresses were observed after increasing the post weld heat treatment (PWHT) temperature by 100 or 150°C. All conditions displayed a significant hydrostatic tensile stress field component, which is generally difficult to relieve. This work demonstrates that residual strain measurements have to be carried out using a high spatial resolution in order to resolve the sharp strain gradients apparent in LFW Titanium alloys.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Residual Stresses Measured By Synchrotron Diffractionmentioning

confidence: 97%

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