Notched tensile strength of SP-700 laser welds

Tsay, L.W.; Ding, Y.S.; Chung, Wei-Chih; Chen, C.

doi:10.1016/j.matlet.2007.07.059

Cited by 19 publications

(21 citation statements)

References 5 publications

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“…The use of such configuration could completely reflect notch brittleness of the tested specimens under tensile loading. [16][17][18]20) For the welds, the notches were located at the center of the fusion zone (FZ) to ensure the crack growth along the weld centerline during tensile loading. Notched tensile tests were carried out in air at a constant displacement rate of 1.0 mm/ min.…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

“…15) For Ti-4.5Al-3V-2Fe-2Mo welds, PWHTs at 704°C or higher cause a coarsening of aϩb structures and result in a reduced notch brittleness. 16) Titanium alloys have been widely applied to aerospace and military industries at the temperature often below 550°C. With the presence of sharp notches, the maintenance of high notched strength at elevated temperature is necessary for the material to resist cracking and/or embrittlement under tensile straining.…”

Section: Introductionmentioning

confidence: 99%

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The Influence of Microstructures on the Notched Tensile Fracture of Ti–6Al–6V–2Sn Welds at Elevated Temperatures

2010

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Notched tensile tests of Ti-6Al-6V-2Sn welds, which were subjected to distinct post-weld heat treatments (PWHTs), were carried out in air at 150, 300 and 450°C. The results were compared with those of mill-annealed base metal (MB) specimens tested at same temperatures. The notched tensile strength (NTS) of the MB specimens decreased significantly with increasing temperature. Moreover, the welds with high hardness showed notch brittleness at room temperature but had a higher NTS than the MB specimen. The presence of grain boundary a layer promoted grain boundary shear, therefore, reduced its notch brittleness at room temperature for the weld with the PWHT at 704°C (the W-704 specimen). A lack of deformation compatibility at the interfaces between the a and b phases caused interfacial separations in the MB specimen as well as void formation in the W-704 specimen, leading to the low NTS of these specimens at elevated temperatures.KEY WORDS: notched tensile test; Ti-6Al-6V-2Sn; post-weld heat treatment.

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Section: Materials and Experimental Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Influence of Microstructures on the Notched Tensile Fracture of Ti–6Al–6V–2Sn Welds at Elevated Temperatures

2010

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“…This alloy in the millannealed condition also exhibits low anisotropy of tensile properties with respect to rolling direction. 12) Typical tensile properties of the mill-annealed Ti-4.5Al-3V-2Fe-2Mo include the ultimate tensile strength of 960 MPa, yield strength of 940 MPa and elongation of 17%.…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

Influence of Microstructures on the Notched Tensile Strength of Ti-4.5Al-3V-2Fe-2Mo Alloy

et al. 2008

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The notched tensile strength (NTS) of Ti-4.5Al-3V-2Fe-2Mo specimens with distinct heat treatment conditions was investigated and correlated to microstructures. The specimens were solution-treated at either 980 or 870 C (above or below the -transus) and then waterquenched prior to aging treatments. After aging at 482, 593, and 704 C, titanium martensite ( 0 or 00 ) decomposed into and with distinct sizes. Additionally, the specimens aged at 482 C were particularly susceptible to notch brittleness, regardless of the solution temperature. As the aging temperature increased, the lower hardness associated with coarsened þ structures resulted in decreased notch brittleness of the alloy. In general, the specimens containing primary in microstructure were prone to brittle fracture and reduced NTS. The alignment of martensite packets (or needles) with respect to the crack growth direction could affect the fracture appearance of the specimens, particularly for the coarsegrained specimens which were solution-treated at 980 C. Furthermore, the existence of grain boundary for the specimens aged at 593 C or higher promoted grain boundary sliding during notched tensile tests.

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“…16,17) In previous studies, the use of such specimens completely reflects the notch brittleness of the laser welds under tensile loading. [17][18][19] The decreased hardness (improved ductility) results in reduced notch brittleness and improved impact toughness of the preheated Ti-4.5Al-3V-2Fe-2Mo weld, relative to the non-preheated weld. 20) It is reported that a high heat-input welding process to decrease cooling rate after welding will produce a ductile, tough, stress-corrosion resistant Ti-6Al-6V-2Sn weld with a small reduction in tensile yield and fatigue strength.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Preheating on Notched Tensile Strength and Impact Toughness of Ti-6Al-6V-2Sn Laser Welds

2011

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Notched tensile strength (NTS) and impact toughness were determined for Ti-6Al-6V-2Sn laser welds subjected to post-weld heat treatment (PWHT) at distinct temperatures. In this study, the specimens were either preheated at 300 C or maintained at room temperature before laser welding. The preheated weld, associated with a reduced cooling rate, had obviously lower hardness than the non-preheated weld in the as-welded condition. After PWHT at 482 C for 3 h, the preheated weld also exhibited considerably lower hardness than the non-preheated weld. In general, preheating at 300 C could effectively increase the NTS and impact toughness of Ti-6Al-6V-2Sn laser welds. The preheated weld in the as-welded condition had superior NTS to other welds being tested. On the other hand, the welds after PWHT at 704 C possessed the best resistance to unstable impact fracture, regardless of preheating. Usually, the coarse þ structures together with intergranular were responsible for the high NTS and impact toughness of the weld.

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Notched tensile strength of SP-700 laser welds

Cited by 19 publications

References 5 publications

The Influence of Microstructures on the Notched Tensile Fracture of Ti–6Al–6V–2Sn Welds at Elevated Temperatures

The Influence of Microstructures on the Notched Tensile Fracture of Ti–6Al–6V–2Sn Welds at Elevated Temperatures

Influence of Microstructures on the Notched Tensile Strength of Ti-4.5Al-3V-2Fe-2Mo Alloy

The Effect of Preheating on Notched Tensile Strength and Impact Toughness of Ti-6Al-6V-2Sn Laser Welds

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